Kotoba Dojo
Train your words. Command any AI
What it does
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.
Train your ability to communicate with AI through a game. Reach Level 100, then enter Ninja Training to build something real and earn your certificate.
Your account has been deleted. Thank you for training with us. Describe a reference image in your own words → an AI draws what you said → you're scored on how close it got. A training game that sharpens how precisely you put things into words — and how well you prompt any AI. You don't need to memorize prompts. You need to see — with your own eyes — what your words actually produce. Kotoba Dojo turns that into a game. AI courses hand out "magic prompts." They work once, then your situation changes. The prompt was never the problem — you were vague, so the answer was too. This isn't prompt engineering. It's knowing what you want, precisely enough that an AI can act on it. Engineer or not,…from kotobadojo.letiziainc.com
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I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
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Launched alongside, August 2026
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I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
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