Remember what you learn
Make a card, answer it, and Synapsio estimates when you're likely to forget it and brings it back before it slips away. It works offline, keeps your cards on your device, and you can start right now without signing up.
No account needed. Your cards stay on this device until you choose to sync them.
New to this?
Reading something again feels like learning, but it often doesn't last. Spaced repetition is a way to study that works the other way around: instead of going over everything, you test yourself on one thing at a time, and only when it's due.
A question and its answer, or a sentence with one word hidden.
Think of the answer, turn the card over, and say how it went: Again, Hard, Good or Easy.
A card you knew waits longer each time. A card you missed comes back soon. Today tells you how many are ready to review, and that's your whole to-do list.
Try one
The left ventricle.
Each dot is an answer, and the space between dots is the wait.
This one's just a demonstration. In the app, each gap comes from your own answers.
Why it works
It comes from memory research, and here's what that research says.
1 week
A week later, people who had tried to recall a passage remembered more than people who read it over again. On a test five minutes later, the rereaders did better. That may be why cramming feels like it works.1
317
A review of 317 experiments looked at how practice should be timed. The longer you want to keep something, the longer the best gap between sessions.2
2 of 10
Of ten common study techniques, a review rated only two as high utility: testing yourself, and spreading practice out. Rereading and highlighting were rated low.3
What we can't promise. These results come from the researchers, not from us. We haven't measured how much Synapsio itself helps anyone, and what you get from it depends on what you're learning and how often you show up.
The schedule
Your answers tell Synapsio how well you know each card. It brings a card back when you're likely to start forgetting it, and leaves the rest alone. You don't set up anything: write cards, answer them, and the gaps sort themselves out.
The schedule comes from FSRS-6, the Free Spaced Repetition Scheduler, an open-source model of how memory fades. For every card it keeps an estimate of how hard the card is for you and how long you're likely to hold on to it, and each answer updates both. A card comes back when the chance you still remember it drops to the target, which starts at 90%. Changing the target in deck options is coming later.
Making cards
Synapsio was designed for a phone first. There's no markup to learn and no template to fill in.
Write a sentence, put your cursor on a word, and press Blank. The word hides when the card asks and shows when you turn it over.
Turn on Ask both ways and one card becomes two, one in each direction. That's handy for vocabulary.
Spell it out instead of just thinking it, when spelling is the point.
A live preview shows each card as it will look before you add it.
Decks and tags to sort them, with bold, italics and links inside a card.
Local first
Your library is on your device, not on a server somewhere. Making and reviewing cards never needs an account. An account adds sync and backup, and later Myla and AI tools.
Making cards and reviewing them never needs one.
Once it's open, you can review on a plane or in a basement.
Sign in to back up your cards and use them on your phone and your computer.
It runs in your browser, and you can add it to your home screen.
One thing to know. Browsers can clear what a site has stored, and some phones are strict about it. Adding Synapsio to your home screen helps, and we ask the browser to keep your library, but only an account is a real backup. Without one, your cards exist on this device alone.
Coming later
These aren't in Synapsio yet. They're planned, so here's what to expect.
It drafts cards from your text, for you to tick and keep.
Bring in cards from elsewhere, and export yours again. Not here yet.
Write things out, and make cards from what you select.
Cover parts of a picture, record your voice, and have cards read aloud.
No. Open the app and make a card. Reviewing and making cards never need one. An account adds sync and backup, and later Myla and AI tools.
Free while it's in beta.
In your browser's storage, on this device. If you sign in, a copy also goes to our server so your other devices can sync.
With an account, sign in on another device and your cards come back. Without one, they're gone, because this device was the only place they existed.
Nobody. The cards you make or import are your own, and Synapsio doesn't check what's in them. It isn't medical or clinical guidance, so check anything that matters against a source you trust.
Not yet. Export is planned, along with import, and it isn't in the app today. If leaving easily matters to you, it's fair to wait for it before moving a big deck here.
Yes. Writing cards and reviewing them both work offline, and sync waits until you're back.
Yes, in the browser, and some browsers can install it. Sign in on both to keep your phone and computer in step.
Who made this
Synapsio was created with someone who works as an RN in the ER, with the help of AI. It's for nurses, nursing students and everyone else with something they want to remember.