2 Google Japanese Input alternatives

LangCorrect

Getting your writing corrected by native speakers

IntermediateAdvanced

Free + paid options

Keep a journal in Japanese and native speakers correct it sentence by sentence, explaining why. In return, you correct entries written in your own native language.

HiNative

Quick checks on whether something sounds natural

BeginnerIntermediateAdvanced

Free + paid options

Q&A app where you ask native speakers questions about Japanese, such as whether a sentence sounds natural or how to say something, and get answers in text or audio.