This product was not featured by Product Hunt yet. It will not be visible on their landing page and won't be ranked (cannot win product of the day regardless of upvotes).
Kaku fixes grammar, particles, and keigo in every desktop app, right where you type, and tells you why. When you ask, it also improves rough drafts, changes tone, or translates into natural Japanese.
Have you ever typed a Japanese message… then spent 10 minutes wondering if you just offended someone? 😅
That was me.
Learning Japanese isn’t just about grammar. It’s about navigating a culture where the same sentence can sound polite, awkward, or even rude depending on how you say it. The fear of getting it wrong stopped me from practicing more than I’d like to admit.
So I built something I wish I had from day one.
Kaku doesn’t just correct grammar—it helps you write naturally based on the context and level of politeness, so you can send your message with confidence while learning along the way.
If you’ve ever hesitated before hitting Send, Kaku is for you.
I’d love for you to try it and tell me what you think! 🇯🇵
Finally, something that explains the grammar fix instead of just silently correcting me. The keigo suggestions in my emails felt surprisingly natural too.
the inline explanations actually teach you the grammar, not just patch the sentence. really thoughtful touch for anyone learning keigo and particles in context.
Finally something that doesn't just auto-correct my particles into chaos. The little hover explanations actually helped me understand why a fix was made.
About Kaku on Product Hunt
“Write Japanese with confidence.”
Kaku was submitted on Product Hunt and earned 0 upvotes and 4 comments, placing #160 on the daily leaderboard. Kaku fixes grammar, particles, and keigo in every desktop app, right where you type, and tells you why. When you ask, it also improves rough drafts, changes tone, or translates into natural Japanese.
Kaku was featured in Productivity (656.2k followers), Writing (59.3k followers) and Languages (14.4k followers) on Product Hunt. Together, these topics include over 162.9k products, making this a competitive space to launch in.
Who hunted Kaku?
Kaku was hunted by Kakuprotech. 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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