Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.

Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.

Userbrain - Easy, fast, and affordable user testing for websites and prototypes.

Eduflow - Digital learning that actually teaches students something

UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!

Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.