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).
Kotoba Dojo is a gamified training ground for precise wording. You see a reference image → describe it in your own words → an AI regenerates the image from your description → you get scored on how close it got. Rank up from white belt to black belt. 22 languages. Credit system. Sign in with Apple/Google, Stripe, GDPR account deletion. Built by a solo founder with zero engineering background, using only AI coding agents. 16 days, ~40 hours of directed work, from blank to production.
Hey Product Hunt. I don't write code. No degree. The only skill I have is describing what I want in words — and that skill is exactly what this product trains.
After prison I drove trucks. Then I started a small e-commerce side business and used AI to write product copy — without knowing the word "prompt." I just typed what I felt. That habit is also how I build software now: I can't code, so talking to AI agents is the only way I know. Kotoba Dojo is the 6th product I've shipped since March. Bootstrapped from Tokyo — no funding, no team, no hunter network.
The game: you see an image, describe it in your own words, an AI redraws it from your description, and you get scored on how close it got. White belt to black belt, 22 languages. The sensei — a Shiba Inu in a gi — tells you which words changed the picture.
Who it's for: anyone who uses ChatGPT, Claude, or Gemini at work but feels their prompts are vague — or anyone who wants to practice turning what they see into words.
Free to try, no credit card. You start with 10 rounds. The first gallery item is one full round if you want to watch before playing.
I've never learned the "right way" to do any of this, so I want your honest take:
1. Try one round — did the scoring feel fair? Did the sensei's feedback teach you something?
2. Is 10 free rounds enough to understand the game before the paywall?
3. If you use AI at work — would training like this actually help you write better prompts?
Ask me anything about building SaaS with zero coding background. I'm here all day (JST).
About Kotoba Dojo on Product Hunt
“Train your words. Command any AI”
Kotoba Dojo was submitted on Product Hunt and earned 2 upvotes and 3 comments, placing #159 on the daily leaderboard. Kotoba Dojo is a gamified training ground for precise wording. You see a reference image → describe it in your own words → an AI regenerates the image from your description → you get scored on how close it got. Rank up from white belt to black belt. 22 languages. Credit system. Sign in with Apple/Google, Stripe, GDPR account deletion. Built by a solo founder with zero engineering background, using only AI coding agents. 16 days, ~40 hours of directed work, from blank to production.
Kotoba Dojo was featured in Education (79.1k followers), Artificial Intelligence (477.4k followers) and Games (98.8k followers) on Product Hunt. Together, these topics include over 178.1k products, making this a competitive space to launch in.
Who hunted Kotoba Dojo?
Kotoba Dojo was hunted by Jun Aida. 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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Jun Aida
this is actually a pretty fun way to learn prompting lol, way better than just reading prompt guides