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.

Grammarly - Clear, effective, mistake-free writing everywhere you type.

Fluent - Fluent is a people-based marketing platform that uses real-time, one-to-one interaction to create custom audiences and serve personalized ads that drive performance at scale.

Gramara - AI grammar correction with transformers

Perfect Tense - AI-powered grammar checker with an API

Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.