Can I vibe code Duolingo?
Gamified language lessons with streaks and leagues.
Duolingo is not an app you're missing; it's a decade of curriculum design, A/B-tested streak psychology, and speech models wrapped in an owl. No prompt produces forty languages of expert-sequenced content or the leaderboard full of strangers keeping you honest. What you can build — and it's genuinely worth building — is a drill app for the one skill you're actually stuck on: an LLM generates fresh exercises at your level, grades your answers, and schedules reviews. Narrower than Duolingo, and often more useful.
Don't rebuild Duolingo — build the focused drill app it can't be. Ask me for one target skill (e.g. Spanish preterite vs imperfect) and my level. Each day, generate ten fresh exercises with an LLM — fill-in-the-blank, translation both directions, one short free response — grade my answers with a one-line explanation, and store every miss in Postgres. Missed items return on a spaced-repetition schedule ahead of new material. Add a streak counter, a daily email nudge, and a weekly summary of my most-missed patterns. Next.js on Vercel, Postgres, one LLM API route; keep each session under five minutes.
A daily drill app for one specific skill — say, Spanish past tense — where an LLM generates exercises at your level, grades answers with explanations, and tracks a streak.
- Expert-designed curriculum that sequences grammar so you never hit a wall
- The freakishly effective streak, league, and notification psychology
- Tuned speech recognition for pronunciation practice
- Millions of learners making it feel like a game instead of homework
People aren't paying for exercises — they're paying for a system that has spent a decade learning how to make them come back tomorrow.
A prompt is the first move, not the whole game. Course 01 teaches you to take a prompt like this one to a shipped, working app — reviewing, correcting, and steering the agent the whole way.
Start Course 01 →