KOEN

Flashcards: Spaced Repetition

SPACED · REPETITION

Make flashcard decks, paste words in bulk from Excel or CSV, and review only the cards due today with SM-2 spaced repetition. Saved in your browser, no sign-up.

Auto-saved

Deck

TODAY

0 due today

Each card comes back after the interval shown on the button you press. Intervals use the SM-2 spaced repetition algorithm, and your progress is saved only in this browser.

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HOW TO

How to use

  1. Create a deck with “+ New deck”, then add cards one at a time in Manage cards, or copy two columns from Excel or Google Sheets and use Paste many cards.
  2. In Study, check how many cards are due today and press Start studying. Click the card or press Space to flip it.
  3. Rate how well you remembered it with Again, Hard, Good or Easy (keys 1–4). The card comes back after the interval shown on the button.
  4. Open Stats to see your reviews over the last 14 days, accuracy, the next 7 days of reviews and how your cards are progressing.
PAIRS WELL WITH

Pairs well with

FAQ

FAQ

How is the SM-2 spaced repetition calculated?

It uses SuperMemo's SM-2 formula. Again = 1, Hard = 3, Good = 4 and Easy = 5 points. With 3 or more, the first review comes after 1 day, the second after 6, and after that the previous interval × the ease factor (EF). EF starts at 2.5, changes with each grade (minimum 1.3), and Again resets the interval to 1 day. As in the original SM-2, the interval uses the EF from before the update, so Hard, Good and Easy can show the same date at first and drift apart later.

What happens when I press Again?

The card is scheduled for tomorrow and also comes back a few cards later in the current session. That repeat is practice only and doesn't change the schedule; pressing Good or better clears it.

Can I import a CSV or Excel word list?

Yes. Put one card per line as “front[Tab]back” or “front,back”. Wrap text that contains commas in double quotes. A header row like “front,back” is skipped, and cards with a front that already exists are skipped by default.

Where is my progress saved?

Cards and study history are stored only in this browser (localStorage) and never sent to a server. To continue on another device, download a JSON file with Backup and load it with Import. You can also export a single deck as CSV.