Learning English with examples that feel real, right when you’re about to forget them.
The problem
Vocabulary lists without context fade in days, and generic examples look nothing like the learner’s life.
Impact
2×words retained at 30 days
−60%AI cost per user
My role
The whole product: idea, review algorithm, API and model integration.
Technical decisions
Spaced repetition that adjusts the interval after every answer.
Examples generated with Claude Sonnet and validated before they’re shown.
Examples cached per word and level to keep cost per user down.
StackVite · React · Nest.js · Claude Sonnet
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