How Deckberry works
Deckberry shows you each card at the moment you're about to forget it — not sooner (that wastes your time on things you still know) and not later (by then you've already forgotten it). Hitting that moment is what turns a few minutes a day into memory that lasts. This is called spaced repetition, and here's how it works.
Why timing beats cramming
After you learn something, your ability to recall it fades over time — quickly at first, then more slowly. That's the forgetting curve. Every time you successfully recall a card, the curve flattens: the memory gets stronger, and the next gap before you need to see it again can be much longer.
So the intervals grow naturally — a card you keep getting right might come back after 1 day, then 3, then a week, then a month, then a season. You spend your effort only on the cards that need it, exactly when they need it.
The one setting that matters
You get a single honest dial: how much you want to remember. The default is 90% — aim to recall 9 out of 10 cards when they come due.
- Turn it up, and cards return sooner — more reviews, fewer things forgotten.
- Turn it down, and intervals stretch — fewer reviews, a few more slips.
It's the real "study more vs. remember more" tradeoff, and it's yours to set.
All you do is rate each card
After you see the answer, you tap one of four buttons. That single tap is the only thing Deckberry needs from you — it schedules everything else:
| You tap | It means | What happens |
|---|---|---|
| Again | I forgot it | The card comes back soon to relearn |
| Hard | I got it, but it was a struggle | A shorter next interval |
| Good | I recalled it fine | The interval grows normally |
| Easy | That was trivial | A long jump before you see it again |
You never "finish" — and nothing is ever locked
When a deck says "all caught up," it doesn't mean you're done — it means the queue is empty for now. Every card still has a future date when it'll come back, right before you'd forget it. Learning a deck is ongoing by design, not a level you clear once.
And you're never boxed in:
- Want to study ahead? Go for it. Reviewing early is perfectly valid — Deckberry knows exactly how long it's been and adjusts accordingly.
- Want to start a deck over? Reset it, and every card schedules as brand new again. Your study history stays intact — a reset clears the schedule, never your record.
Built on FSRS, an open algorithm
The scheduling is powered by FSRS (the Free Spaced Repetition Scheduler) — a modern, open-source algorithm built on a well-studied model of human memory. It's the successor to the classic method older flashcard apps used, and it's better at one thing that matters: giving you the same retention for fewer reviews.
Even better, FSRS learns. After you've built up enough review history, Deckberry can tune the schedule to your memory specifically — so the timing fits the way you personally remember and forget.
It works offline, and stays private
Because the timing is computed right on your device, you can study anywhere — no connection required. When you're back online, your progress syncs automatically. Deckberry shows no ads and uses no advertising trackers; see our privacy policy for the details, or the support page if you have a question this didn't answer.