What problems is Courier solving and how is that benefiting you?
Applications always have a need to notify users of different events happing within a given system. Usually, those developers have to build those systems manually, which means having to learn the ins and outs of Email vs SMS vs Slack, and then often the notifications themselves are hard-wired into the codebase, making it VERY difficult to change them based on the needs of your GTM team.
Courier solves that problem by doing the heavy lift for you, letting you fire off notification events in your system, and handling the message designer and integration for you. Marketing and Sales teams can customize the messages as necessary, and users can pick which platforms they'd like to get notifications on.
Courier literally saved me > $30k in coding + implementation costs, and I was up and running in under a day. It's the new gold standard for developer APIs. Review collected by and hosted on G2.com.