Most apps make the flashcards. We check you learned them.
Synapsi turns any lecture, PDF, or video into a study kit, then proves you got it: a Feynman teach-back an AI judges, plus real spaced repetition that finds your gaps.
Synapsi started with a familiar 2am problem. You've watched the lecture twice, highlighted half the slides, and still can't explain the thing in plain English. The effort was real. It just went into re-watching and highlighting, never into testing whether any of it had stuck.
So we built the loop we wished we'd had. Paste a lecture, get back a summary, a mind map, and a set of flashcards. Capture once, then spend your real time on recall instead of stenography.
That's still the whole idea. Make the boring half of studying disappear, so the part that actually works gets your attention.
Four convictions we build around.
Mastery is measured, not declared
Saying you studied isn't proof. Synapsi only moves a concept toward mastered when you've recalled it and taught it back. The states advance on real signals, never a streak that flatters you.
The best study tool is the one you reopen
A perfect deck you never review loses to a decent one you do. We optimize for material you'll actually come back to.
Your notes are yours
We never sell your data and never train models on it. That's not a setting. It's the architecture.
Cheap enough for a student budget
We sell on the web to skip the platform tax and run a genuinely full free tier, so price is never the reason you can't study.