Spaced repetition, done right
Remember everything, effortlessly.
Sona pairs Quizlet's simplicity with Anki's power — FSRS-driven spaced repetition that tells you exactly what to review, and when.
How it works
Write it once. Sona decides when you see it again.
Three steps, and the third one repeats for as long as you want to keep the material.
Bring your material
Type cards, paste a CSV, fork a public deck, or let Sona draft them from a topic, a file, or a recording.
Rate what you recall
Again, Hard, Good, Easy. One keystroke each — the interval under every button shows what it costs you.
Come back to a queue
FSRS schedules each card individually. Open Sona and the day's work is already decided.
8 quiz modes
Testing that isn't just flipping cards.
Pick a pool — everything, your frequent misses, or one rating band — then pick how you want to be asked. Quizzes never touch your review schedule.
AI card generation
Bring the material. Sona writes the cards.
Every suggestion goes through a review step before it ever touches a deck — nothing is added unread.
Describe a topic
Type what you want to study — up to 500 characters — and Sona drafts cards for it.
Upload a file
A PDF, image, Word, or PowerPoint file, parsed directly by the model. No OCR, no separate text-extraction step.
Upload a recording
A lecture or a voice memo, up to 60 minutes, transcribed and then turned into cards.
Pro 10 generations a month, up to 50 cards each.
Download a deck. Study on the metro.
Reviews you rate with no connection sync themselves the moment you're back. Offline study is free, on every device — it is not a paid tier.
Fork someone else's deck and make it yours.
A fork is an independent copy — your schedule, your edits, your notes. The original can change without disturbing your progress.
Pricing
Sona does not charge users for learning.
Pro covers only the features with real ongoing infrastructure cost. Downgrading never deletes or archives anything.
Your first review is two minutes away.
Make a deck, add three cards, rate them once. Tomorrow Sona will tell you which one to look at again.