This tool simulates a Leitner box system, the classic spaced repetition method. New cards start in Box 1 and move to higher boxes when you answer them correctly, so easy cards are reviewed rarely and hard cards come back every day.
Why it helps. Studying works best when you do something active with the material instead of only reading it again. This leitner box spaced repetition simulator turns a vague plan into a clear next step. You spend less time deciding what to do and more time actually learning. It runs fully in your browser, and nothing you type is sent to a server or saved anywhere unless the tool itself says so.
How to use it
- Count how many cards sit in each of your boxes.
- Type the counts into the five boxes.
- Press the button to see the review intervals.
- Review Box 1 daily, and each higher box only when its interval comes due.
Worked example
You have 20 cards in Box 1, 12 in Box 2 and 8 in Box 3. The tool shows Box 1 reviews daily, Box 2 every 3 days and Box 3 every 7 days, so your daily load is small even with 40 cards in the system.
Honest limits
This is a planning simulation, not a card app: it does not store your cards or send reminders. Use it to plan, then review with real cards or your flashcard app.
Study tips that make it work
Keep Box 1 small. If more than 30 new cards land there in one day, tomorrow’s review becomes a chore and you will skip it.
Use the tool in short, focused sessions. Twenty-five to fifty minutes of real work beats three hours of half-reading. After each session, write down one thing you still cannot explain in your own words, and make that the first job of your next session. Small daily steps build stronger memory than one long weekend cram, and a tool like this is only useful if you return to it often.
Who this is for
This tool suits school students, university students and adult learners who study on their own. It also suits tutors who want a quick, free activity for a study session without setting up accounts or software. If you study with a group, run the tool on a shared screen and work through the output together, because talking through results out loud is itself a strong study technique. The tool asks for nothing about you, so it works just as well for a first-year student as for someone returning to study after years away.
Common mistakes to avoid
The most common mistake is running the tool once and never returning. A single use produces a nice output and no learning. The second mistake is feeding it vague input: vague tasks, vague notes and vague lists produce vague outputs, and the tool cannot fix input it cannot see. The third mistake is trusting the output without checking it. Always read the result, compare it with your notes, and correct anything that looks wrong before you study from it. A tool supports your judgement; it does not replace it.
Try this in the next seven days
On day one, run the tool once with real material from your current topic, not a test sentence. On day two, use the output in a real study session and note what worked and what did not. On day four, run it again with fresh material and compare the two outputs. By day seven, decide whether this tool earns a place in your weekly routine or whether a different tool from this site fits better. Keeping only the tools you actually reuse is how a study system stays light enough to survive a busy term.
Frequently asked questions
Is it really free? Yes. The tool runs in your browser with no account, no sign-up and no payment.
Does it save my work? No, unless the tool description says it saves locally in your browser. Copy anything you want to keep into your own notes.
Can I use it on my phone? Yes. The tool works on phones, tablets and computers with a modern browser.
Versión en español: https://ilmhunt.com/simulador-de-cajas-leitner/