Deckist

Spaced repetition for Mac and the web. iPhone and iPad are on the way.

Flashcards that never ask which copy to keep.

Review on your Mac, again in your phone's browser on the train, fix a typo at any desk. Every answer is one entry in a record, and every device sorts the same box from it. There is no conflict dialog, because there is nothing to conflict.

Start FreeGo To Your Decks How The Sync Works

The Mac app is free and complete on its own. Get the Mac app. The subscription covers syncing: 14 days free, then $6 a month.

Two devices, one box.

Rate a card on either device. Answer the same card on both, and both answers count.

iPhone 9:41 AM

The capital of Australia

  1. Tomorrow
    • Water
  2. 3 days
    • Australia
  3. 1 week
    • 2 weeks
      • 1 month
        • 2 months
          • 6 months

            The record

            3 entries
            1. 8:12 AM iPhoneThe capital of AustraliaAustraliaGood
            2. 8:14 AM MacThe capital of AustraliaAustraliaGood
            3. 8:30 AM MacBoiling point of waterWaterEasy

            Conflicts None, and it cannot be otherwise.

            Mac 9:41 AM

            Boiling point of water

            A model of the real derivation: the interval grows with each answer and starts over on Again. Nothing is overwritten, and nobody is asked to choose.

            Your history is a record, not a state.

            Everything else on this page follows from that sentence.

            Every answer is an entry

            This card, this moment, this rating, this device. An entry is never edited, and its identity comes from its own contents, so the same answer recorded twice is one entry.

            Syncing is a union

            A union does not care which device syncs first, what order the batches arrive in, or how many times a bad connection retries. The result is the same set, and nobody's work is dropped.

            The schedule is derived, everywhere

            No device stores a due date. Each one sorts its box from the merged record with the same engine, so two devices holding the same entries agree without exchanging a single date.

            So nothing asks which copy to keep

            A conflict needs two versions of one fact. A record has no versions, only entries. How the sync works.

            FSRS fitted to your own record.

            FSRS, the Free Spaced Repetition Scheduler, decides when each card comes back. Its published parameters are an average of everybody; Deckist fits them to your record once there is enough of it.

            Fitted to you

            Once your record holds about 400 reviews, the parameters are refit to your own history in the background. Below that it declines, and says how many reviews are left, because fitting a fortnight makes a worse schedule than the defaults.

            One engine, every surface

            The scheduler is one engine, built once and run in the Mac app and in the browser. They cannot disagree about what is due, because they run the same code on the same record.

            One card, every time it comes up

            RatedNext inDrawn to scale
            Good1 day
            Good3 days
            Good8 days
            Again1 day
            Good5 days
            Good14 days
            Easy40 days

            Bring your decks from Anki.

            And follow shared decks without losing a day of history.

            Import keeps your history

            Each note keeps the id Anki gave it, which survives every export. Import a deck a second time and it updates the wording in place and leaves the reviews keyed to those cards alone. A collection backup brings the real review record across.

            Shared decks update without losing a day

            Follow a deck from the catalog and pull new versions. Your answers are keyed to the card, not the file, so an update changes the content and leaves months of scheduling where it was. Fork it, and you keep everything.

            Both are part of the subscription.

            The apps are free. The subscription covers the servers.

            What costs money to run is syncing between devices and keeping the catalog current, so that is what you pay for.

            The apps

            $0

            on your own devices, with no account and no card
            • The Mac app, complete and free
            • Unlimited cards and decks of your own
            • FSRS, fitted to you once you have the history
            • Basic and cloze cards
            • iPhone and iPad apps: coming soon

            Your cards are yours either way. Export the collection whenever you like, and it opens in Anki.

            Download for Mac

            Apple silicon, macOS 14 or later.

            The subscription

            $6

            a month, or $50 a year
            • Sync between every device you own, and the web client
            • A merge that never asks which copy to keep
            • Import from Anki, with your review history intact
            • Image occlusion cards
            • Follow shared decks and pull updates without losing history
            • Publish your own decks to the catalog

            14 days of everything free, and no card to start.

            Start FreeGo To Your Decks See The Pricing

            Hear about new things.

            Product news, a few times a year, by email, and nothing else to that address.

            Product news only. To leave the list, write to support@deckist.app.