Flashcards that schedule themselves
Spaced repetition flashcards for the things you always meant to learn
Each card comes back just before you would forget it, so a few minutes a day turns into knowledge that lasts. Start with ready-made decks on geography, space, science, history and money, or write your own.
US States by Shape
Which state is this?
How Tidecards helps you remember
Reviews at the right moment
Tidecards uses FSRS, a modern open-source scheduler, to estimate when your memory of each card is starting to fade. Cards you know spread out to weeks, then months. Cards you keep missing come back the same day.
Five kinds of card
Flip cards for ideas. Typed answers for names and dates. Multiple choice for maps and flags. True or false for popular myths. Fill in the blank for a number inside a sentence. Each fact gets the question that suits it.
Forgiving about typos
Type “Sacremento” and it still counts. You’re tested on knowing the answer, not on spelling it perfectly. Short answers and numbers do have to be exact.
1,300+ cards ready to study
All 50 US states with maps and flags. Every country on the map, with its capital and flag. The planets, the elements, the presidents in order, the amendments, cognitive biases and personal finance basics.
Decks of your own
Write cards one at a time with pictures, or paste a whole list from a spreadsheet or an Anki export. Your decks stay private to your account.
A habit you can keep
Choose how many new cards a day you want (20 to start). The review page shows how many are left today. The stats page tracks your streak and how much you’re retaining.
How it works
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Pick a deck
Browse the built-in decks or start one of your own. Add as many as you like.
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Answer what’s due
Tidecards mixes new cards with ones you’ve seen, a few from each deck.
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Come back tomorrow
Ten minutes or so a day is enough. The schedule adjusts to how each card is going.
Decks you can start today
Geography
Space
Science
Thinking and money
Words
Questions
What is spaced repetition?
A way of studying where you review something just as you’re about to forget it. Each successful review makes the memory last longer, so the gaps grow: a day, then a few days, then weeks, then months. It is one of the best-supported findings in the research on learning.
What is FSRS?
The Free Spaced Repetition Scheduler, an open-source algorithm that models how quickly you forget each card based on your own answers. Anki now uses it too. Compared with older schedules, it usually reaches the same retention with fewer reviews.
How long does it take each day?
With the default of 20 new cards a day, most people spend 10 to 20 minutes. If that’s too much, lower the number in your account settings and the daily reviews shrink with it.
Can I bring cards from Anki or a spreadsheet?
Yes. Export plain text with one card per line, question and answer separated by a tab, then paste it into one of your decks. Semicolons and commas work as separators too.
I’ve never been good at memorizing. Will this work for me?
Spaced repetition does most of what people put down to a good memory. If you answer honestly and come back most days, the cards stick. Missing a few days is fine: Tidecards holds back new cards until you’ve caught up, so the backlog doesn’t snowball.
Pick something you’ve always meant to learn
Capitals you half remember from school, the night sky, the order of the presidents, a language you started once. Ten minutes a day is enough to make real progress on any of them.