We’ve been using Mirage at Heroku since 2015 on critical customer-facing apps. It's enabled our team to grow without sacrificing speed in either our development or testing workflows.

For me, the real magic of Mirage is that it lets us write tests from the user's perspective. We take user stories from our product team and translate them 1:1 into tests, without ever having to break flow by stepping outside the front-end toolchain.

Mirage is, in short, an essential tool for every UI developer.