Duolingo

Duolingo is a language learning platform that makes use of GPT-3 technology to offer French grammar corrections. Studies conducted by the Duolingo team have shown that its use leads to a significant improvement in second language writing abilities!

Duolingo is easy to use and designed to be accessible to everyone. It is available on the web and as an app for mobile devices and requires only a few minutes of your time each day to get started. The lessons are based on scientific principles and cover 35+ languages.

Source: https://openai.com/api/