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kaku.so
Japanese kanji dictionary + handwriting spaced repetition
kaku.so is two tools in one: a fast Japanese dictionary and a spaced-repetition study system built on top of it. Unlike Anki, nothing to build - see a word, tap once, it's in your reviews. And it trains recall, not recognition. No multiple choice, no tapping the "right" answer - you handwrite each word from memory, stroke by stroke, on a canvas. Reviews hit right before you'd forget. For dedicated learners it's brutal in the best way - it turns you into a kanji terminator.
Hey Product Hunt 👋
I'm Adrian. I built kaku.so because I was learning Japanese as a hobby and kept hitting the same wall - I'd "recognize" a kanji on a flashcard, feel like I knew it, then blank completely when I had to actually write it. Recognition and recall are different skills, and almost every app trains the easy one.
So kaku.so does two things. First, it's a genuinely fast Japanese dictionary - look anything up, instantly. Second, anything you look up you can drop straight into a spaced-repetition study queue with one tap. No deck-building like Anki, no curating cards - the dictionary and the study tool are the same thing.
And it forces recall: meaning + reading shown, blank canvas, you write the word from memory. FSRS-6 schedules reviews right before you'd forget. It's demanding, but for dedicated learners that's the point - you actually retain what you study instead of fooling yourself.
It's free, no ads, no tracking, and I have no plans to ever change that. I'm one person building it after hours while finishing a PhD in an unrelated field, so I'd love feedback -especially what's missing or annoying. What would make a tool like this genuinely useful for your own studying?
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About kaku.so on Product Hunt
“Japanese kanji dictionary + handwriting spaced repetition”
kaku.so was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #117 on the daily leaderboard. kaku.so is two tools in one: a fast Japanese dictionary and a spaced-repetition study system built on top of it. Unlike Anki, nothing to build - see a word, tap once, it's in your reviews. And it trains recall, not recognition. No multiple choice, no tapping the "right" answer - you handwrite each word from memory, stroke by stroke, on a canvas. Reviews hit right before you'd forget. For dedicated learners it's brutal in the best way - it turns you into a kanji terminator.
kaku.so was featured in Android (57.3k followers), Productivity (653.8k followers), Education (78.7k followers) and Languages (14.4k followers) on Product Hunt. Together, these topics include over 214.8k products, making this a competitive space to launch in.
Who hunted kaku.so?
kaku.so was hunted by Adrian Sieradzki. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Adrian Sieradzki