Spaced Repetition Scheduler

The Spaced Repetition Scheduler is a free online tool that optimize learning with sm-2 spaced repetition. create flashcards, review at optimal intervals, track mastery with a 30-day calendar view.. It runs entirely in your browser with no installation or sign-up needed.

Rate recall 0-5 after each review. Cards you struggle with reset to 1-day interval; known cards space further apart (interval x ease factor). Ease factor adjusts over time based on performance.

In your browser localStorage. Export as JSON anytime to back up or transfer decks.

Yes — completely free, no registration, no server.

Yes, the Spaced Repetition Scheduler is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Spaced Repetition Scheduler in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Spaced Repetition Scheduler works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Cramming packs many repetitions into one session, which works for a test the next morning but fades fast because each fact is reviewed while it is still fresh, giving the memory little reason to strengthen. Spaced repetition does the opposite: it spreads reviews across expanding intervals so you see a card just as you are about to forget it, and each successful recall at that point flattens the forgetting curve and pushes the next review further out. The result is long-term retention from less total study time, which matters when you hold hundreds of cards across a long course. This scheduler uses the SM-2 algorithm to pick those intervals for you, so a passing grade moves a card from one day to six days to weeks. Add your own cards and review only what is due each day.

The ease factor is a per-card multiplier that controls how quickly a card's review interval grows. Every new card starts at 2.50, meaning that once a card is past its first two fixed steps, its next interval is the current interval multiplied by 2.50. After each review the factor is nudged up or down based on the grade you give: rating a card easy raises it slightly, while struggling lowers it, with a hard floor of 1.30 so intervals never collapse to almost nothing. A lower ease factor produces tighter, more frequent reviews, which is exactly what a difficult card needs. You can see each card's current ease factor on the Manage tab and on the review screen. Grade honestly so the factor reflects real recall and schedules each card sensibly.

After you reveal a card's answer, you grade your recall on a six-point scale that drives the SM-2 schedule. The buttons are Again (0, complete blackout), Hard (1, wrong but familiar), Difficult (2, wrong but easy to recall), Good (3, correct with difficulty), Easy (4, correct with some hesitation), and Perfect (5, instant recall). Any grade below 3 counts as a lapse: the card's interval resets to one day and its repetition streak goes back to zero, so you will see it again soon. A grade of 3 or higher counts as a pass and pushes the next review further out. The exact grade also fine-tunes the ease factor, so Perfect stretches intervals more than a barely-passing Good. Reveal each answer first, then grade it truthfully to keep your schedule accurate.

A card is marked as mastered once its review interval grows past 21 days, meaning you have recalled it correctly enough times in a row that the algorithm now waits more than three weeks before showing it again. Reaching that point usually takes at least three successful passes: the first sets the interval to one day, the second to six days, and the third multiplies six by the ease factor, which for a default card lands around 15 days, with the next pass crossing the 21-day line. A single lapse, any grade below 3, resets the interval to one day and removes the mastered status until you rebuild the streak. The summary strip at the top of the tool shows a live count of mastered cards alongside your total, due-today, and next-seven-days numbers. Keep reviewing due cards to watch that mastered count climb.

You can import any deck once it is shaped as a JSON array of objects with front and back fields, like [{ "front": "Question", "back": "Answer" }]. The Import tab accepts either pasted JSON text or an uploaded .json file, and you can include extra fields such as easeFactor, interval, repetitions, and nextReview to preserve scheduling progress from a previous export. There is no direct Anki .apkg or Quizlet uploader, so you first convert those decks to that simple JSON shape using their own export options or a spreadsheet, then paste the result. Imported cards are added to your current deck rather than replacing it, so you can merge several sources. To move a deck back out or to another device, use the Export or Copy JSON buttons. Paste your array into the Import tab to bring a deck in within seconds.