# Best API Mocking Software

  *By [Adam Crivello](https://research.g2.com/insights/author/adam-crivello)*

   Application programming interface (API) mocking software simulates the behavior of APIs during software development and testing. These platforms enable developers, QA engineers, and other technical teams to create and deploy mock APIs that mimic the functionality of real APIs without needing a live backend or third-party service.

These products allow teams to define custom API endpoints, set up response scenarios, and simulate various network conditions. By creating virtual API environments, developers can work independently of backend services, test edge cases, and validate client-side code without relying on production systems.

API mocking software typically supports multiple API protocols, such as representational state transfer (REST), Graph query language (GraphQL), and simple object access protocol (SOAP). It can generate realistic mock data based on API specifications like OpenAPI or custom schemas.

 

API mocking is closely related to [service virtualization software](https://www.g2.com/categories/service-virtualization), though service virtualization encompasses entire services or systems beyond strictly APIs.

To qualify for inclusion in the API Mocking category, a product must:

- Provide a platform for creating and managing mock APIs
- Support multiple API protocols, like REST, GraphQL, SOAP
- Allow users to define custom API endpoints and response scenarios
- Offer the ability to simulate various network conditions and error states




  
## How Many API Mocking Software Products Does G2 Track?
**Total Products under this Category:** 23

### Category Stats (Jun 2026)
- **Average Rating**: 4.45/5 The average rating of products in this category, based on all submitted ratings
- **New Reviews This Quarter**: 5
- **Buyer Segments**: Small-Business 70% │ Mid-Market 20% │ Enterprise 10% Represents the distribution of reviewers across all products in this category.
- **Top Trending Product**: Beeceptor (+0.1%) - Among all products in this category, Beeceptor recorded the largest rating increase compared to last month
*Last updated: June 10, 2026*

  
## How Does G2 Rank API Mocking Software Products?

**Why You Can Trust G2's Software Rankings:**

- 30 Analysts and Data Experts
- 300+ Authentic Reviews
- 23+ Products
- Unbiased Rankings

G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.

  
## Which API Mocking Software Is Best for Your Use Case?

- **Leader:** [Apidog](https://www.g2.com/products/apidog/reviews)
- **Easiest to Use:** [Apidog](https://www.g2.com/products/apidog/reviews)
- **Top Trending:** [Mockoon](https://www.g2.com/products/mockoon-mockoon/reviews)
- **Best Free Software:** [Apidog](https://www.g2.com/products/apidog/reviews)

  
  ## What Are the Top-Rated API Mocking Software Products in 2026?
### 1. [Apidog](https://www.g2.com/products/apidog/reviews)
  Apidog Inc. is a US development platform company founded in 2022. The company operates internationally, serving clients ranging from small teams to enterprise-level organizations with flexible pricing based on team size. Apidog offers an integrated platform that combines API design, debugging, testing, documentation, and mocking in a single interface. Key features include visual OpenAPI design tools, automated testing with CI/CD integration, professional documentation generation, smart mock servers, and multi-protocol support—all working seamlessly together with branch-based development capabilities. Apidog solves the challenge of fragmented API development by replacing multiple specialized tools with one cohesive platform, eliminating inefficient context switching between applications. By implementing a true API Design-first approach, the platform ensures a single source of truth throughout development, accelerating development cycles while improving collaboration, quality, and time-to-market for API deliveries.


  **Average Rating:** 4.9/5.0
  **Total Reviews:** 214

**Who Is the Company Behind Apidog?**

- **Seller:** [Apidog](https://www.g2.com/sellers/apidog)
- **Company Website:** https://apidog.com/
- **Year Founded:** 2023
- **HQ Location:** Middletown, US
- **LinkedIn® Page:** https://www.linkedin.com/company/anakin-ai/ (6 employees on LinkedIn®)

**Who Uses This Product?**
  - **Who Uses This:** Software Engineer, Senior Software Engineer
  - **Top Industries:** Computer Software, Information Technology and Services
  - **Company Size:** 46% Small-Business, 31% Mid-Market


#### What Are Apidog's Pros and Cons?

**Pros:**

- Ease of Use (98 reviews)
- API Management (88 reviews)
- Features (79 reviews)
- API Integration (78 reviews)
- User Interface (61 reviews)

**Cons:**

- API Limitations (17 reviews)
- Learning Curve (15 reviews)
- Learning Difficulty (15 reviews)
- Poor UI (12 reviews)
- Limited Customization (11 reviews)

### 2. [Beeceptor](https://www.g2.com/products/beeceptor/reviews)
  Beeceptor is an AI-powered API and Service virtualization platform that helps you eliminate dependencies, accelerate testing, and deliver software faster. Instead of waiting for backend services, third-party APIs, partner systems, or test environments, your teams can instantly create realistic virtual services and continue independently. Designed for QA engineers, SDETs, developers, architects, platform teams, solution engineers, and enterprise organizations, Beeceptor combines AI-assisted service creation, real-time traffic inspection, and enterprise-grade governance into a single platform that is easy to adopt and delivers value within minutes. You can connect it to agentic frameworks like Claude, GPT, Copilot, etc. ## Build virtual services in a few seconds. Traditional service virtualization tools often require specialized skills, lengthy setup cycles, and dedicated teams. Beeceptor takes a different approach. You can generate virtual services from OpenAPI specifications, Swagger files, GraphQL schemas, SOAP/WSDL definitions, Postman collections, sample requests and responses, or recorded API traffic in under 60 seconds. The AI automatically generates endpoints, mock responses, realistic test data, request validation rules, and service behaviors, dramatically reducing setup effort. ## Eliminate dependencies and enable shift-left testing Most often software delivery delays are caused by unavailable services, unstable test environments, vendor sandboxes, API rate limits, or dependencies on other teams. These small issues build up, and cause the delivery date to be pushed. Beeceptor allows teams to virtualize external dependencies, build isolated test environments, so your team work independently. ## Common use cases include: \* API and contract-first development \* Shift-left testing and quality engineering \* Frontend and mobile development before backend completion \* Integration and end-to-end testing \* Test suite integration, CI/CD automation, \* Partner and vendor sandbox environments \* Legacy system simulation \* Microservices testing \* Performance, chaos and resilience testing \* Developer onboarding and training environments ## AI-powered service virtualization Beeceptor uses AI natively to accelerate the creation and maintenance of mock/virtual services. Here are the top features \* Generate mock APIs from specifications and schemas. Upload Swagger, WSDL, GraphQL, gRPC, Postman, specs. \* Create realistic test data automatically from the context, field names, description, etc \* Use AI to fix human errors, in the context. \* Build OpenAPI spec from the recorded production traffic. \* Detect contract drifts in the implementation and get notified about it. ## Comprehensive protocol support Beeceptor supports modern API ecosystems and enterprise integration patterns, including: \* REST APIs \* OpenAPI and Swagger \* GraphQL \* SOAP and WSDL services \* Webhooks \* Web-socket \* Server-Sent Events (SSE) \* CRUD APIs - backed with a database. \* Mutual TLS (mTLS) \* HTTP-based enterprise integrations ## Dynamic and stateful service simulation Beyond simple static mocks, Beeceptor supports advanced service virtualization scenarios including the following. \* Stateful workflows \* Multi-step transactions \* Session-aware interactions \* Conditional responses \* Dynamic payload generation \* Request correlation \* Delays and latency conditions \* Network failures and error scenarios \* Rate limiting and throttling behavior \* Edge-case and negative-path testing ## Real-time visibility and traffic recording Beeceptor provides real-time visibility into API traffic as requests occur. This is best in the class, request response interception, so you can inspect requests, validate payloads, debug integrations, and identify issues without requiring access to upstream systems. ## Reduce infrastructure and API costs Their engineering rely on expensive third-party APIs, vendor sandboxes, or shared environments that incur usage costs and operational overhead. A lot of Beeceptor customers save cost. Beeceptor helps reduce: \* Third-party API consumption costs \* Usage-based API charges \* Vendor sandbox limitations \* Environment maintenance effort \* Infrastructure provisioning requirements \* Delays caused by shared testing resources ## Enterprise-ready by design Beeceptor is built for enterprise adoption and large-scale engineering organizations. Enterprise capabilities include: \* Single Sign-On (SSO) \* SAML integration \* Role-based access control \* Audit logs \* Governance and approval workflows \* IP allowlists and access controls \* Sensitive data masking in HTTP headers and payload. \* Private cloud deployment, On-premises deployment \* Dedicated infrastructure options \* Unlimited-scale enterprise usage ## Faster time-to-value The biggest advantage of Beeceptor is speed. You move from an API specification, sample payload, or recorded traffic to a fully functional virtual service in minutes. No specialized virtualization expertise is required. No infrastructure needs to be provisioned. No dependency teams need to be involved. The result is faster releases, better test coverage, reduced integration risk, lower operational costs, and a more dependency-free engineering culture.


  **Average Rating:** 4.8/5.0
  **Total Reviews:** 76

**Who Is the Company Behind Beeceptor?**

- **Seller:** [Beeceptor](https://www.g2.com/sellers/beeceptor)
- **Year Founded:** 2017
- **HQ Location:** Hyderabad, Telangana
- **Twitter:** @beeceptor (172 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/beeceptor/ (6 employees on LinkedIn®)

**Who Uses This Product?**
  - **Who Uses This:** Software Developer
  - **Top Industries:** Computer Software, Information Technology and Services
  - **Company Size:** 51% Small-Business, 25% Mid-Market


#### What Are Beeceptor's Pros and Cons?

**Pros:**

- Ease of Use (35 reviews)
- Speed (15 reviews)
- Easy Setup (14 reviews)
- API Testing (11 reviews)
- Integrations (10 reviews)

**Cons:**

- Missing Features (8 reviews)
- Request Limitations (7 reviews)
- Limited Features (3 reviews)
- UX Improvement (3 reviews)
- Bug Issues (2 reviews)

### 3. [WireMock Cloud](https://www.g2.com/products/wiremock-wiremock-cloud/reviews)
  WireMock Cloud is AI-native API simulation platform for simulating APIs and services with speed and precision. It enables teams to accelerate development and testing through robust, stateful API simulation, support for REST, SOAP, GraphQL, and gRPC, and alignment with OpenAPI and schema-first workflows. With dynamic request matching, data source stubbing, enterprise-grade controls, Cloud, on-premise or hybrid deployment options, and an intuitive, developer and QA friendly UX, WireMock Cloud replaces legacy service virtualization with a scalable, easy-to-use solution for building and testing integrations faster.


  **Average Rating:** 5.0/5.0
  **Total Reviews:** 10

**Who Is the Company Behind WireMock Cloud?**

- **Seller:** [WireMock](https://www.g2.com/sellers/wiremock)
- **HQ Location:** Menlo Park, California
- **LinkedIn® Page:** https://www.linkedin.com/company/wiremock/ (12 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 50% Mid-Market, 30% Enterprise


#### What Are WireMock Cloud's Pros and Cons?

**Pros:**

- Ease of Use (4 reviews)
- Customer Support (3 reviews)
- API Testing (2 reviews)
- Integrations (2 reviews)
- Tools (2 reviews)

**Cons:**

- API Limitations (1 reviews)
- Expensive (1 reviews)
- Limited Community Support (1 reviews)

### 4. [Mockoon](https://www.g2.com/products/mockoon-mockoon/reviews)
  Mockoon is a powerful, open-source platform designed to streamline API mocking processes. It offers a comprehensive suite of tools tailored to meet the needs of developers, QA engineers, and teams working with APIs. API Mocking Tools Mockoon provides intuitive and robust API mocking tools, enabling users to create, manage, and test API endpoints effortlessly. With Mockoon, you can simulate complex API behaviors, including request/response cycles, latency, and error handling. This ensures that your application can handle real-world scenarios before going live. CLI for Integration Testing Mockoon's Command Line Interface (CLI) facilitates seamless integration testing. The CLI allows you to automate API mock server operations, making it an ideal tool for continuous integration and deployment (CI/CD) pipelines. By integrating Mockoon into your workflow, you can ensure consistent and reliable testing outcomes across various environments. Cloud Services for Team Collaboration and Deployment Mockoon Cloud Services enhance team collaboration and deployment capabilities. With cloud-based solutions, teams can collaborate in real-time, share mock API configurations, and synchronize changes effortlessly. The cloud platform also supports easy deployment of mock servers, ensuring that your team can access and test APIs from anywhere, anytime. Open Source and Community-Driven As an open-source project, Mockoon benefits from a vibrant community of developers and contributors. This ensures continuous improvement, regular updates, and a wide range of features driven by user needs. The open-source nature of Mockoon also means that it is highly customizable, allowing you to tailor it to your specific requirements.


  **Average Rating:** 4.5/5.0
  **Total Reviews:** 17

**Who Is the Company Behind Mockoon?**

- **Seller:** [Mockoon](https://www.g2.com/sellers/mockoon)
- **Year Founded:** 2017
- **HQ Location:** Luxembourg
- **LinkedIn® Page:** https://www.linkedin.com/company/mockoon (2 employees on LinkedIn®)

**Who Uses This Product?**
  - **Top Industries:** Computer Software
  - **Company Size:** 41% Small-Business, 35% Enterprise


#### What Are Mockoon's Pros and Cons?

**Pros:**

- Free Usage (2 reviews)
- Open Source (2 reviews)
- Deployment (1 reviews)
- Ease of Use (1 reviews)

**Cons:**

- Learning Curve (1 reviews)
- Poor Documentation (1 reviews)

### 5. [Mockaroo](https://www.g2.com/products/mockaroo/reviews)
  Mockaroo is a data generator and API mocking tool helps in creating custom CSV, JSON, SQL, and Excel datasets to test and demo software.


  **Average Rating:** 4.2/5.0
  **Total Reviews:** 12

**Who Is the Company Behind Mockaroo?**

- **Seller:** [Mockaroo](https://www.g2.com/sellers/mockaroo)
- **Year Founded:** 2003
- **HQ Location:** San Francisco, CA
- **LinkedIn® Page:** https://www.linkedin.com/company/mockaroo-dev/ (1 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 42% Small-Business, 33% Mid-Market


#### What Are Mockaroo's Pros and Cons?

**Pros:**

- Ease of Use (4 reviews)
- User Interface (3 reviews)
- Easy Setup (2 reviews)
- Speed (2 reviews)
- API Testing (1 reviews)

**Cons:**

- Data Limitations (2 reviews)
- Limited Features (2 reviews)
- Limited Functionality (2 reviews)
- Data Security (1 reviews)
- Poor Customer Support (1 reviews)

### 6. [Mockfly](https://www.g2.com/products/mockfly/reviews)
  Mockfly is a cloud-based platform designed to help developers create, manage, and simulate mock APIs for development and testing purposes. It offers a range of features that set it apart from other mocking tools, such as AI integration for data generation, mock diffs to track changes, and a Chrome extension for the automatic addition of endpoints​. Key features of Mockfly include: \* Intuitive Interface: It has a user-friendly interface that makes it easy to create and manage mock APIs​. \* Collaborative Capabilities: You can invite team members to collaborate on API mock projects, making it ideal for team environments​. \*Multiple Responses: It allows you to create multiple responses for a single endpoint to simulate different scenarios​. \* Automatic Documentation: Mockfly can automatically generate comprehensive documentation for your API, saving time and effort​. \* Random Data Generation: Integration with Faker.js allows you to add random data to your API responses for more realistic testing​. \*AI-Powered Features: AI is used to generate realistic mock data and automatic endpoint descriptions, enhancing efficiency​. \* Real-Time Collaboration: Teams can collaborate efficiently with real-time updates on mock API projects​. \* Mockfly also offers a free version with a limit of 500 requests per day, which allows users to explore its features without committing to a paid plan​.


  **Average Rating:** 5.0/5.0
  **Total Reviews:** 6

**Who Is the Company Behind Mockfly?**

- **Seller:** [Mockfly](https://www.g2.com/sellers/mockfly)
- **HQ Location:** N/A
- **Twitter:** @getmockfly (47 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 83% Small-Business, 17% Mid-Market


#### What Are Mockfly's Pros and Cons?

**Pros:**

- Ease of Use (5 reviews)
- Features (2 reviews)
- User Interface (2 reviews)
- API Management (1 reviews)
- Collaboration (1 reviews)

**Cons:**

- API Management (1 reviews)
- Complex Interface (1 reviews)
- Data Inaccuracy (1 reviews)
- Data Limitations (1 reviews)

### 7. [Mock API](https://www.g2.com/products/mock-api/reviews)
  Mock API is an affordable online API mocking server that allows developers to generate a mocked API in less than 30 seconds and it supports a free forever plan for individuals


  **Average Rating:** 4.5/5.0
  **Total Reviews:** 4

**Who Is the Company Behind Mock API?**

- **Seller:** [Prime Dev](https://www.g2.com/sellers/prime-dev)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 50% Mid-Market, 25% Enterprise


#### What Are Mock API's Pros and Cons?

**Pros:**

- Ease of Use (3 reviews)
- Features (3 reviews)
- Testing (3 reviews)
- API Integration (1 reviews)
- Automation (1 reviews)

**Cons:**

- Complex Implementation (1 reviews)
- Poor Customer Support (1 reviews)
- Time Consumption (1 reviews)

### 8. [Mockable.io](https://www.g2.com/products/mockable-io/reviews)
  Mockable is a simple configurable service to mock out RESTful API or SOAP web-services.


  **Average Rating:** 4.2/5.0
  **Total Reviews:** 3

**Who Is the Company Behind Mockable.io?**

- **Seller:** [mockable.io](https://www.g2.com/sellers/mockable-io)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 67% Small-Business, 33% Enterprise


#### What Are Mockable.io's Pros and Cons?

**Pros:**

- Ease of Use (3 reviews)
- API Testing (2 reviews)
- API Management (1 reviews)
- Automation (1 reviews)
- Easy Integrations (1 reviews)


### 9. [MockLab](https://www.g2.com/products/mocklab/reviews)
  MockLab is an API simulator that helps software teams test faster and better.


  **Average Rating:** 4.7/5.0
  **Total Reviews:** 3

**Who Is the Company Behind MockLab?**

- **Seller:** [MockLab](https://www.g2.com/sellers/mocklab)
- **Year Founded:** 2017
- **HQ Location:** Menlo Park, California, United States
- **Twitter:** @mocklab (1 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/wiremock/ (13 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 67% Mid-Market, 33% Small-Business


#### What Are MockLab's Pros and Cons?

**Pros:**

- API Management (1 reviews)
- Speed (1 reviews)

**Cons:**

- Testing Issues (1 reviews)

### 10. [Mocky.io](https://www.g2.com/products/mocky-io/reviews)
  The world easiest & fastest tool belts to mock your APIs|


  **Average Rating:** 4.0/5.0
  **Total Reviews:** 2

**Who Is the Company Behind Mocky.io?**

- **Seller:** [Mocky.io](https://www.g2.com/sellers/mocky-io)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 50% Mid-Market, 50% Small-Business


### 11. [Mocklets](https://www.g2.com/products/mocklets/reviews)
  Meet Mocklets, a HTTP-based mock API simulator, which helps simulate APIs for faster parallel development and more comprehensive testing.


  **Average Rating:** 4.0/5.0
  **Total Reviews:** 1

**Who Is the Company Behind Mocklets?**

- **Seller:** [Mocklets](https://www.g2.com/sellers/mocklets)
- **Year Founded:** 2019
- **HQ Location:** Bangalore, IN
- **Twitter:** @mocklets (39 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/mocklets/about/ (2 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 100% Mid-Market, 100% Small-Business


#### What Are Mocklets's Pros and Cons?

**Pros:**

- Ease of Use (2 reviews)
- Flexibility (1 reviews)
- Helpful (1 reviews)
- User Interface (1 reviews)

**Cons:**

- Missing Features (1 reviews)
- Slow Performance (1 reviews)

### 12. [Mocko — Mocks made easy, simulate your REST API for free](https://www.g2.com/products/mocko-mocks-made-easy-simulate-your-rest-api-for-free/reviews)
  Proxy your API, choose which endpoints to mock in the cloud and inspect traffic, for free. Speed up your development and integrations tests.


  **Average Rating:** 3.5/5.0
  **Total Reviews:** 1

**Who Is the Company Behind Mocko — Mocks made easy, simulate your REST API for free?**

- **Seller:** [Mocko](https://www.g2.com/sellers/mocko)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 100% Enterprise


#### What Are Mocko — Mocks made easy, simulate your REST API for free's Pros and Cons?

**Pros:**

- Ease of Implementation (1 reviews)
- Ease of Use (1 reviews)

**Cons:**

- Poor UI (1 reviews)

### 13. [Requestly](https://www.g2.com/products/requestly/reviews)
  Requestly is a modern and powerful companion for API Development and Testing. It is an open-source tool purpose-built to speed up and simplify API development workflow for developers and QAs. It is a combination of API Client and HTTP Interceptor that helps create and share API Contracts, testing APIs, and easily mock and integrate them into web and mobile apps. Requestly Benefits: ✅ Open Source: Requestly is open-source tools, giving transparency on how we handle your data. ✅ API Client: A modern & privacy-first API Client with all the features like API Collection, Variables, Scripts. ✅ Intercept HTTPS Traffic: Enables you to watch traffic from the mobile app you are developing for testing and debugging. ✅ HTTP Request Modification: Enables network request and response modification to mock different edge cases and scenarios of a real app. ✅ API Mocks: Creates local and cloud based API mocks to develop and isolate testing of an application. ✅ Record & Bulk mocks: Supports recording traffic of an existing service and create mocks in few seconds. ✅ Team Workspaces: Offers flexibility to work with team and share mocks, request modification rules and API contracts with team. ✅ GraphQL Support: Integrates with GraphQL development flows using different set of filters for GraphQL APIs. Learn more at: https://requestly.com/


  **Average Rating:** 4.7/5.0
  **Total Reviews:** 5

**Who Is the Company Behind Requestly?**

- **Seller:** [Requestly](https://www.g2.com/sellers/requestly)
- **Year Founded:** 2021
- **HQ Location:** San Francisco, US
- **Twitter:** @requestlyio (1,574 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/requestly (11 employees on LinkedIn®)

**Who Uses This Product?**
  - **Company Size:** 40% Small-Business, 40% Mid-Market


#### What Are Requestly's Pros and Cons?

**Pros:**

- Time-saving (2 reviews)
- Cross-Browser Testing (1 reviews)
- Easy Implementation (1 reviews)
- Implementation Ease (1 reviews)
- Setup Ease (1 reviews)

**Cons:**

- Complexity (1 reviews)
- Difficult Setup (1 reviews)
- Learning Curve (1 reviews)

### 14. [AutoStub 2.0](https://www.g2.com/products/autostub-2-0/reviews)
  AutoStub™ is an essential tool to fasten API development. It can significantly reduce your build time by quickly designing, prototyping, documenting and testing the APIs. AutoStub creates a functional mock that allows developers or prospective users to work with the API before it’s fully implemented. It allows developers to mock web services, helping developers of applications that depend on APIs to speed development and improve quality by facilitating functional testing. Key Features: 1. Simulate ReST and SOAP services 2. Input format - Swagger files for ReST, WSDL files for SOAP services 3. Support for GET, POST, PUT, DELETE methods in ReST 4. Create WSDL/Swagger 2.0 based mock services; generate dummy data for API testing 5. Get an endpoint URL that can be used on a third party SOAP client tool 6. Improves quality by facilitating functional testing 7. Can handle multiple test scenarios together



**Who Is the Company Behind AutoStub 2.0?**

- **Seller:** [Torry Harris Business Solutions](https://www.g2.com/sellers/torry-harris-business-solutions-c3668e74-c103-4807-af4b-6e3d792d8cd4)
- **Year Founded:** 1998
- **HQ Location:** Perth Amboy, US
- **Twitter:** @torryharris (1,768 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/torry-harris-integration-solutions (2,177 employees on LinkedIn®)



### 15. [HTTPeep](https://www.g2.com/products/httpeep/reviews)
  HTTPeep is an HTTP/HTTPS debugger and programmable proxy that lets you intercept, modify, route, and mock traffic with a composable rule engine. Set breakpoints on requests and responses, rewrite headers and bodies, throttle networks, and map traffic to local or remote services. Use file-based rules under version control to share templates across teams, and run the same features from a full terminal UI and CLI for remote workflows



**Who Is the Company Behind HTTPeep?**

- **Seller:** [HTTPeep](https://www.g2.com/sellers/httpeep)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)



### 16. [MockAPI](https://www.g2.com/products/mockapi/reviews)
  MockAPI lets users mock up APIs, generate custom data, and perform operations on it using RESTful interface.



**Who Is the Company Behind MockAPI?**

- **Seller:** [Mockapi](https://www.g2.com/sellers/mockapi)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)



### 17. [Mock/it](https://www.g2.com/products/mock-it/reviews)
  Mock/it provides dead simple API mocking for the lowest price (Free or $4.99/month) you'll find on the internet. With custom sub-domains, team accounts, logging and more, you'll have all the features you actually need to easily mock your API.



**Who Is the Company Behind Mock/it?**

- **Seller:** [Mock/it](https://www.g2.com/sellers/mock-it)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)



### 18. [PinusX Webhooks](https://www.g2.com/products/pinusx-webhooks/reviews)
  Test webhooks instantly without signup. Get unique HTTPS URLs that capture every request. Inspect headers, format JSON payloads, and debug integrations in real-time. Features: • Instant unique webhook URLs • Real-time request inspection • Auto-formatted JSON payloads • Copy as cURL • Free tier forever



**Who Is the Company Behind PinusX Webhooks?**

- **Seller:** [PinusX ](https://www.g2.com/sellers/pinusx)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)



### 19. [Sparrow](https://www.g2.com/products/sparrow-2025-01-07/reviews)
  Sparrow is an AI-powered API testing platform designed to streamline and automate testing for developers, QA engineers, and DevOps teams. It supports REST and GraphQL APIs, integrates seamlessly with Git for version control, and offers self-hosting for secure infrastructure management. Key features include AI-driven test automation, real-time collaboration, mock servers, automated data generation, and environment vaults. With new enhancements like active sync with Swagger/OpenAPI, AI-powered test flow completion, and improved team collaboration, Sparrow helps teams test faster, reduce manual errors, and scale efficiently—making API testing seamless, intelligent, and collaborative.



**Who Is the Company Behind Sparrow?**

- **Seller:** [Techdome](https://www.g2.com/sellers/techdome)
- **Year Founded:** 2020
- **HQ Location:** Hyderabad, IN
- **LinkedIn® Page:** https://www.linkedin.com/company/techdome-solutions (107 employees on LinkedIn®)
- **Ownership:** Rahul Joshi
- **Phone:** 7723849516 



### 20. [Specmatic](https://www.g2.com/products/specmatic/reviews)
  Specmatic is a visual AI-ready API testing and governance platform that transforms API specifications into executable contracts, enabling development teams to validate API implementations, perform service virtualisation, and monitor API ecosystem health without writing code. This comprehensive solution addresses the critical challenges faced by organisations using microservices architectures, where API compatibility issues often emerge late in the development cycle. Built on the open-source Specmatic engine, the platform serves software development teams, QA engineers, API architects, and engineering managers who need to ensure reliable API integrations whilst maintaining development velocity. The platform consists of two integrated components: Studio provides a visual, no-code interface for contract testing, API mocking, and specification management, whilst Insights delivers organisation-wide API governance through dependency visualisation and adoption analytics. Teams can either directly access the underlying Specmatic engine via CLI for programmatic control or leverage Studio's graphical interface for collaborative workflows. Key Features and Benefits: • Visual Contract Testing: Automatically generates and executes comprehensive API tests from specifications (OpenAPI, AsyncAPI, GraphQL, gRPC, WSDL, Arazzo) without requiring code, enabling cross-functional teams to participate in API quality assurance • Intelligent Service Virtualisation: Creates realistic API mocks based on specifications with fault injection capabilities, allowing teams to test against dependencies and simulate error conditions like timeouts and service failures • Backward Compatibility Validation: Integrates with Pull/Merge Request workflows to identify breaking changes before code implementation, preventing integration issues from reaching production environments • Multi-Protocol Support: Supports diverse API specifications and communication protocols including HTTP (REST), Kafka, JMS, Google Pub/Sub, SOAP, JDBC, RESP (Redis), and Avro in a language-agnostic manner • Organisational API Governance: Provides service mesh visualisation, contract adoption tracking, and integration health monitoring through centralised dashboards that aggregate data from multiple development environments The platform enables teams to practice contract-driven development by treating API specifications as living, executable documents rather than static documentation. This approach reduces dependency on integration testing, accelerates parallel development of services, and provides early detection of compatibility issues. Development teams can work independently whilst maintaining API contract compliance, significantly reducing time-to-market for new features and services. Specmatic Studio & Insights integrates seamlessly with existing CI/CD pipelines and development workflows, making it suitable for organisations of varying sizes that need to scale their API testing and governance practices without increasing technical complexity or resource requirements.



**Who Is the Company Behind Specmatic?**

- **Seller:** [Specmatic](https://www.g2.com/sellers/specmatic)
- **Year Founded:** 2020
- **HQ Location:** Mumbai, IN
- **LinkedIn® Page:** https://www.linkedin.com/company/specmatic (15 employees on LinkedIn®)



### 21. [Speedscale](https://www.g2.com/products/speedscale/reviews)
  Speedscale captures real production HTTP, gRPC, and SQL traffic inside your own Kubernetes cluster and turns it into a closed AI-agent loop: discover → spec → triage → reproduce → validate → PR. Nothing leaves your environment. Bring Your Own Everything. The capture agent, traffic store, and replay engine run as a Kubernetes operator in your cloud — not ours. You bring your apps, your storage, your AI models (private Anthropic, self-hosted Llama, in-house — whatever your compliance posture allows), and your governance controls. Speedscale orchestrates the loop without locking you to any cloud, model vendor, or storage tier. The closed AI-agent loop. When a production failure occurs, the eBPF capture agent records the exact request — full payload, headers, SQL statements, all dependent traffic. An AI triage agent specs the problem, classifies it, and routes it. A reproduction agent replays the identical traffic against your current codebase in a non-production environment to confirm the failure. A validation agent verifies the fix before the PR is opened. Human review is optional at every stage — run fully autonomous or fully human-gated. Same product, different governance. proxymock — the developer entry point. Teams start with proxymock, a free CLI that stands in for downstream dependencies using recorded production responses. AI coding agents (Claude Code, Cursor, GitHub Copilot) query captured production traffic through the MCP integration, giving them real-world context — actual failed requests from your environment — instead of synthetic test data. Enterprise data residency. For regulated industries — financial services, healthcare, payments, regulated retail — production API payloads cannot leave the enterprise environment. Speedscale's BYOC architecture is the only production-traffic-capture approach that satisfies this constraint without sacrificing the payload fidelity needed for AI-driven bug reproduction. Speedscale is used by engineering teams at Home Depot, IHG (InterContinental Hotels Group), FLYR, Cimpress/Vistaprint, Navitaire (an Amadeus subsidiary), and Ascension Health.



**Who Is the Company Behind Speedscale?**

- **Seller:** [Speedscale](https://www.g2.com/sellers/speedscale)
- **Year Founded:** 2020
- **HQ Location:** Atlanta, US
- **Twitter:** @Speedscaleai (144 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/speedscale (19 employees on LinkedIn®)



### 22. [Traffic Parrot](https://www.g2.com/products/traffic-parrot/reviews)
  Traffic Parrot provides API and service simulation, service virtualization and API mocking software and consulting services to both startups and established e-commerce and financial institutions.



**Who Is the Company Behind Traffic Parrot?**

- **Seller:** [Traffic Parrot](https://www.g2.com/sellers/traffic-parrot)
- **Year Founded:** 2016
- **HQ Location:** London, GB
- **LinkedIn® Page:** https://www.linkedin.com/company/traffic-parrot/ (2 employees on LinkedIn®)



### 23. [Zunoy MockAPI](https://www.g2.com/products/zunoy-mockapi/reviews)
  Zunoy MockAPI is an API mocking and simulation tool that helps developers test, prototype, and validate API-based workflows without relying on backend systems or production services. It belongs to the API Development and Testing software category and is designed for frontend developers, QA engineers, DevOps teams, and product managers who need to simulate real-world API behavior during the software development lifecycle. With Zunoy MockAPI, users can instantly create and deploy custom RESTful endpoints that return static or dynamic responses. This enables teams to work in parallel—building UI components, integrating services, or performing automated testing—before the actual APIs are ready. It is especially useful in scenarios involving microservices, third-party APIs, or unstable backend environments. Zunoy MockAPI offers a hosted, web-based interface, making it easy to configure and manage mocks without setting up local environments or writing code. It supports JSON responses, custom status codes, headers, latency simulation, and CORS configuration to replicate real-world API behavior. Key features of Zunoy MockAPI include: Instant API Mocking: Create REST API endpoints with custom paths, methods, and response structures in seconds. Dynamic Responses: Customize responses using variables, random data, and conditional logic to mimic realistic API behavior. Latency and Error Simulation: Add delays, timeouts, and custom error codes to test how your frontend or client handles network issues. No-code Configuration: Use an intuitive web UI to set up mocks—no need to install software or write scripts. Team Collaboration: Share mock APIs via public or private URLs to support collaboration across distributed teams. Zunoy MockAPI helps teams reduce development dependencies, improve testing coverage, and accelerate time-to-market by simulating APIs early in the development process.



**Who Is the Company Behind Zunoy MockAPI?**

- **Seller:** [Zunoy](https://www.g2.com/sellers/zunoy)
- **HQ Location:** Bengaluru, IN
- **LinkedIn® Page:** https://www.linkedin.com/company/zunoy (2 employees on LinkedIn®)
- **Ownership:** Zunoy
- **Phone:** +91




    ## What Is API Mocking Software?
  [Development Software](https://www.g2.com/categories/development)