Zetto
The gym for your Japanese.
A voice-first Japanese training app that measures spoken production in real time and progressively increases difficulty based on performance.
Your language app is lying to you. Streaks don't mean fluency. Recognition doesn't mean production. Zetto measures what actually matters: can you speak Japanese, right now, under pressure?
Zetto is built for adults who want to actually speak Japanese — not collect badges. Android + PWA first, iOS later. Bootstrapping toward launch.
How it works
Production over recognition. Zetto trains you to speak Japanese, not just recognise it. Acoustic telemetry provides millisecond response latency as the primary learning signal.
Crawl → Walk → Run → Fly. Difficulty increases progressively based on real performance, not arbitrary streaks or time-in-app.
A Chinese pedagogical approach to kanji: learn radicals first, build characters from components. Faster retention, less rote memorisation.
Same features at every tier. Paid plans unlock higher limits, not locked features. Everyone gets the full product.
In active development. Full spec — system prompt, onboarding flow, writing systems, branding, unit economics — designed and documented using SPARC in days, not months.
No launch date until it's ready.