We are using per almost 2 years. It is very robust for us to embed inside our solutions. Great support and Stream.IO team is always available to share knowledege about new functionalities.

I've been using stream chat for over a year and can share some of my 1st-year experience and why I chose Stream Chat for my app. What attracted me initially was the list of features and the price point, which were reasonable and scalable. Five nines availability, GDPR and HIPAA compliance, TS React client and UI library, updates and an active GitHub community were all ticks on my checklist. If you've never built a chat app before, this is an excellent place to start with plenty of support docs and videos you can find on YOutube. Using Stream Chat has been a positive learning experience for me. If you're learning and are comfortable with HTML/CSS but new to Javascript or a framework like React, the documentation is excellent at teaching how to customise the app while building your MVP. It's also free for makers so it really lowers the barriers, to turn ideas and concepts into products and features.

It has a UI toolkit for flutter out of the box using the stream_chat_flutter library. This makes chatting integration extremely easy. The examples in the GitHub repo are easy-to-understand works without any extra steps.