Jun Aida

Founder, LETIZIA — building Kotoba Dojo

About

Solo founder in Tokyo. No engineering background, no formal education path — I ship AI products purely by talking to Claude. 6 products since March 2026. Now building Kotoba Dojo: an English dojo where you describe what you see and an AI sensei grades you, belt by belt.

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Maker History

Kotoba DojoTrain your words. Command any AI
Aug 2026

🎉

Joined Product HuntAugust 6th, 2026

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1mo ago

Launched today, buried at #155 — honest feedback wanted on one thing: does the scoring feel fair?

Launched Kotoba Dojo this morning.

Describe a target image in your own words AI redraws from that text only you get scored.

Launch prep was thin and it's buried around #155. If you try one free round, tell me whether the scoring felt fair.

https://www.producthunt.com/prod...

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2mo ago

Kotoba Dojo - Train your words. Command any AI

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.