What is the Leitner system?
The Leitner system organizes flashcards into boxes, spacing reviews further apart each time you get a card right - so you spend more time on the words you find difficult and less on the ones you already know
Back in 2018, when I started seriously learning English, I had the same problem over and over. I'd come across a new word, translate it, and think "okay, I'll remember this." A few days later I'd see the same word again with no idea what it meant, so I'd look it up again, wasting time every time
Then I started writing new words down. Soon they were everywhere - on paper, in spreadsheets, in notes on my laptop and phone, even on napkins - with no structure and no real way to review them
Then I found an article about the Leitner system. It's a simple way to organize flashcards using numbered boxes. When you remember a card, it moves forward and appears less often. When you forget it, it moves back and appears more often. Every word gets its own place, and you have a clear plan for when to review it
Thanks to this approach, after six months of studying every day, I managed to improve my English, find a job in Europe, and start communicating with real people in a language I once thought I would never learn
Eight years later, I decided to turn this idea into code and build a system anyone could use to learn something - not just a language, but mathematical formulas, geography, physics, chemistry, or anything else worth remembering
Sebastian Leitner (1919-1989) was a writer who developed the flashcard learning system that later became known as the Leitner system. He wrote about psychology and learning for a general audience, and described his method in his book So lernt man lernen, which roughly means "How to Learn." The idea is very simple: you use paper cards and several boxes. Cards you remember move to the next box and appear less often. Cards you forget move back and appear more often. This simple system helps you focus on the cards you need to practise most
QuintaCapsa - the name comes from Latin and means "the fifth box" - can handle the sorting and scheduling for you, but the central idea stays the same: practise difficult cards more often and leave longer gaps between the ones you remember
Each flashcard has a question on the front and an answer on the back - for vocabulary, that's usually a word and its meaning. New cards start in Box 1. Reviewing one is three steps:
The higher the box, the less often you'll see that card
There are different versions of the method - Kansas State University's academic success center describes a three-box approach, while QuintaCapsa uses five. The number of boxes and the exact rules for moving cards vary by version. Here's what QuintaCapsa's five-box schedule looks like:
| Box | Review interval |
|---|---|
| 1 | Every day |
| 2 | Every 2 days |
| 3 | Every week |
| 4 | Every 2 weeks |
| 5 | Every month |
Get a card right and it moves up one box. Get it wrong in any box and it returns to Box 1
These intervals are QuintaCapsa's implementation of the method. There is no single five-box timetable that every Leitner system must use
Suppose you add the Spanish word la ventana, meaning "the window." It starts in Box 1
You see la ventana, remember "the window," and mark it correct. It moves to Box 2 and waits two days
At the next review, you remember it again. Into Box 3 it goes, with a week until its next appearance
Then, a week later, your mind goes blank. Back to Box 1
That's the system doing its job - the word needs another visit, so it gets one sooner
The Leitner system is a practical form of spaced repetition - spreading study across separate sessions instead of cramming it into one. Research on verbal learning backs this up: a large review by Cepeda and colleagues found that the most useful spacing partly depends on how long you need to remember the material (read the study on PubMed)
That's the basic idea of spaced repetition: review something several times, but leave more time between reviews when you remember it well. In QuintaCapsa, the boxes make this simple. Cards you remember move forward and appear less often. Cards you forget move back and appear again sooner. This way, you spend more time on the things you find difficult and less time reviewing the things you already know
A useful card asks a clear question with an answer you can judge. For example:
Front: la ventana
Back: the window
That tests whether you recognize the Spanish word. To practise producing it, make a separate card in the other direction:
Front: the window
Back: la ventana
Choose the direction that matches what you want to practise, or use both
If a word has several meanings, add enough context to make the intended answer clear. Keep each card focused enough that Knew it or Didn't know feels like an honest, straightforward choice
Try before you peek: give yourself a real chance to recall the answer before turning the card over. If it only feels familiar after you've seen it, let it come back for more practice - the boxes only help when your answers reflect what you could actually remember
That depends on the version you use. In QuintaCapsa, a card graduates to Learned once it's answered correctly twice while sitting in Box 5 - once to arrive there, and again on a later review to prove it stuck. It then stops appearing in scheduled reviews, and you can move it back into review any time you want more practice
"Learned" is a status in the app. Memory does not come with a lifetime guarantee
Yes. Paper flashcards and labeled boxes or dividers will work - you just need to keep track of which cards to review and when. If you'd rather have the scheduling handled for you, QuintaCapsa uses five boxes to organize your vocabulary practice. Add a word and its meaning, then mark whether you knew it when it comes up
You can start without an account, with up to 26 cards. Guest cards stay in that browser on that device, so export them for a portable backup. A free account saves your cards across devices and raises the limit to 52
Start with a few words you'd like to stop looking up. Give them a box. Come back when they're due
Start learning with QuintaCapsa →
See you in the next one