jpdb combines a Japanese dictionary with a learning system for kanji and vocabulary.
Koohii
Koohii helps users study Japanese kanji using mnemonics from Heisig's Remembering the Kanji and community-created alternatives.
About Koohii
Koohii is a web tool for studying Japanese kanji with James Heisig's "Remembering the Kanji" method. Users can write their own mnemonics or pick one shared by the community, then review with built-in flashcards that can optionally show example words and readings. Reviews run on a spaced repetition system that schedules cards at increasing intervals, and the dictionary highlights words containing only the kanji a learner has already studied, so vocabulary builds gradually. The site is free, has been run from Belgium since 2006, and is used in a browser on desktop or mobile.
Key features
- Create your own kanji mnemonics or use community-submitted ones
- Built-in flashcards for Remembering the Kanji
- Optional example words and readings on flashcards
- Spaced repetition scheduling at increasing review intervals
- Dictionary highlights words using only kanji you have learned
- Browser-based review on desktop and mobile
Best for: Learners working through Heisig's Remembering the Kanji who want mnemonics, flashcards and spaced repetition in one place.
Good for
- Free to use according to the homepage
- Study materials align with Heisig's Remembering the Kanji
- Dictionary supports gradual vocabulary building from kanji already learned
Watch out for
- Built around the Heisig method rather than other kanji curricula
- Described as browser-based review only; no native mobile app is mentioned
Koohii at a glance
- Website
- kanji.koohii.com
- Category
- Education & Learning › Language Learning
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Koohii alternatives
Tools and sites you could use instead, ranked by how closely they match.
Tagaini Jisho is a free, open-source Japanese dictionary and kanji lookup tool for Windows, macOS, and Linux.
The ichi.moe service provides Japanese transliteration and dictionary tools for kanji and word information.
Jisho.org provides a Japanese dictionary with tools to find kanji by their component parts.
KanjiTomo identifies Japanese text in images and is optimized for kanji recognition.
Drops teaches vocabulary in more than 55 languages through short games and mnemonic images.
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Koohii FAQ
Is Koohii free to use?
Yes. The homepage states that Kanji Koohii is free.
What study method does it follow?
It recommends Remembering the Kanji by James Heisig and provides mnemonics and flashcards for that method.
How does the review system work?
It uses spaced repetition, scheduling flashcard reviews at increasing intervals to support long-term memory.
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