sumi: Flashcards & Revision

You believe in spaced repetition. You bounced off the complicated apps.

sumi is for you. It keeps the science and drops the friction, so revision feels calm
instead of overwhelming.

HOW IT WORKS
Make a deck or import one, then open sumi and review the cards it gives you that day.
That is the whole routine. sumi uses FSRS, the modern spaced-repetition algorithm, to show
each card right before you would forget it, so you remember more while studying less.

CALM BY DESIGN
An ink-on-paper interface with nothing competing for your attention. No streaks guilting
you, no leagues, no badges. A gentle daily review you will actually want to come back to.

BRING YOUR OWN DECKS
Already have decks? Import them in seconds. sumi reads Anki .apkg files, plus CSV, TXT and
JSON, so moving over takes minutes, not an afternoon.

PRIVATE BY DEFAULT
No account. No servers. Your cards, your progress and your history never leave your device.
Nothing is tracked. Nothing is uploaded. Your data stays with you.

BUY ONCE, YOURS FOREVER
No subscription. Unlock sumi pro one time and keep it: unlimited decks and cards, unlimited
imports, cram and reverse study modes, and detailed progress insights. Restore anytime.

WHAT YOU GET
- FSRS spaced repetition that schedules every review for the best long-term memory
- Import from Anki (.apkg), CSV, TXT and JSON
- Study offline, anywhere
- Clean stats: retention, review history, cards mastered
- Light and dark, easy on the eyes

Calm, focused and entirely on your device. That is sumi.