App: 1Checker
Developer: Xiaobao Online (Hangzhou) Technology Co., Ltd.
Genres: Productivity, Education

1Checker, the best free grammar checker, allows you to instantly check texts for various mistakes and offers you improvement suggestions for writing better English.
Powered by Artificial Intelligence (AI) and Natural Language Processing (NLP) technologies, 1Checker is an ideal writing enhancement tool with spelling check, grammar check, style review, vocabulary enrichment, dictionary, translation and more this-is-exactly-what-I-want benefits all packed in one.

Release notes:
Compile with Facebook's upgrade to enable Facebook account log-in.