Describe anything you want to learn — a topic, an exam, even pasted notes — and the AI writes a deck of flashcards. From there everything is deterministic: the app schedules each card so you review it right before you'd forget it. You only ever answer one question per card: did you get it right, or miss it?

Each card lives in one of five boxes. Answer it correctly and it moves up a box, waiting longer before its next review — 1, 2, 4, 8, then 16 days. Miss it and it drops back to Box 1 and comes around again in the same session. That's the whole system: cards you know drift up and get out of your way; cards you don't stay close.

Yes. A free account gives you full access — AI-written decks, cloud sync, and unlimited studying. Fair-use limits on AI generation exist purely to prevent abuse; you'll only hear about one if you ever approach it, and studying is never limited.

So your decks and progress live safely in your account in the cloud, instead of trapped in one browser's storage where clearing site data (or Safari's automatic cleanup) could erase them. The sample deck is free to try without one.

Study reviews what's due and updates the schedule. Practice all runs through every card in the deck without changing the schedule — cram as much as you like, your review plan stays intact.

Nothing in it is due — the deck shows when its next review lands. That's the schedule working, not a bug: reviewing early doesn't help memory, but Practice all is always there if you want the reps. Brand-new cards are also introduced at most a set number per day (Settings → "New cards per day") so a big new deck doesn't bury you tomorrow.

Space / Enter — flip the card
1 — missed it  ·  2 — got it
Enter — send in the AI chat (Shift+Enter for a new line)

• Be specific: "AWS Solutions Architect, focusing on networking" beats "AWS".
• Before saving, steer revisions ("go deeper on X, drop Y") — cards you removed stay removed.
• Ask for more cards extends a deck; Edit cards → Ask AI revises a saved one.
• During study, add per-side notes right on a card — tap the faint area at the bottom.
• Flip Q↔A swaps which side you're shown first — per session or as a deck default.
• Organize decks into groups from the Group picker when saving or editing.

Export decks downloads everything — decks, groups, progress — as one JSON file. Import decks reads the same format, so a file is both a backup and a way to share decks with someone else.

Give it a minute and check spam. Still nothing? Use Resend verification email on the Account page — and if it never arrives, email support@numinexstudio.com.

Power users can plug in a personal OpenRouter key under Settings → Advanced. Requests then go directly from your browser, billed to your OpenRouter account, with any model you like — and generation keeps working even past the fair-use limit.

What you type into the AI flows (your prompts and pasted notes) is sent to the model to write your cards; your decks and review history are stored in your account. Signed out, everything stays in this browser. Fair-use limits cap only AI generation — never studying, manual editing, or sync — and reset daily.