Oh My Second Brain
Stop forgetting what you learn. OMSB uses AI + spaced repetition to turn your notes into lasting knowledge. Designed for developers, professionals, and lifelong learners.
npx omsb init to get started from CLI
Why learners love OMSB
FSRS-5 Spaced Repetition
Science-backed scheduling that knows exactly when you're about to forget. Review at the perfect moment.
AI-Generated Study Materials
Drop in your notes — AI creates flashcards, quizzes, and concept tests automatically.
Progress Dashboard
Track your retention rate, streaks, and mastery level. Watch yourself grow.
Built for Speed
Keyboard shortcuts for everything. Space to flip, 1-4 to rate. Review 50 cards in 5 minutes.
How it works
Add Your Notes
Import any Markdown file with omsb add
omsb add my-notes.mdAI Generates Cards
Flashcards and quizzes created from your content
Review & Remember
Spaced repetition ensures long-term retention
omsb reviewThe Science of Forgetting
Without review, you forget 80% within a week. Spaced repetition fights this by reviewing just before you forget. OMSB uses the FSRS-5 algorithm — the most accurate spaced repetition scheduler available — to keep your retention above 90%.