Bunpro
Typed grammar and vocabulary reviews inside changing sentence prompts.
BeginnerIntermediateFreemiumModerateGrammarWeb, iPhone, Android
Japanese grammar resources
Grammar study fails when explanations never become retrieval. Pick the job first.
Tae Kim
A free grammar guide from knowing nothing through advanced constructions.
BeginnerIntermediateFreeEasyGrammarWeb
MaruMori
A guided multi-skill path that combines grammar, reading, kanji, and review.
BeginnerIntermediatePaidModerateTextbookWeb, iPhone, Android
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Grammar resources do two different jobs. Some explain the pattern. Others make you produce it.
If you need the explanation
Start with Tae Kim. It is free, complete enough for beginners, and easy to search when a textbook note is thin.
If you understand it but cannot retrieve it
Use Bunpro. Typed sentence reviews are the point. Keep reading beside it so the pattern stays larger than the blank.
If you want grammar inside a course
MaruMori and Genki fold grammar into a wider path. That is useful when switching tools is the friction.
Do not run all three at full volume. One explanation source and one practice source is enough for most adults.