Spaced Repetition Explained for Language Learners

If you have ever crammed vocabulary the night before a test and forgotten it a week later, you have met the problem spaced repetition solves. It is one of the best-known ideas in memory research, and it is simple enough to use without any software. Here is spaced repetition for language learning in plain terms.

The core idea

Memories fade over time unless you use them. Each time you successfully recall something, though, the memory gets stronger and fades more slowly. So the best time to review a word is just as you're about to forget it. Review too early and you waste effort; too late and you're relearning from scratch.

That leads to growing intervals: see a new word again soon, then after a longer gap, then a longer one still.

A rough schedule you can use

You do not need exact numbers. A typical pattern looks like this:

Same day as you learn the word.
The next day.
A few days later.
About a week later.
A few weeks later.

If you fail to recall a word at any step, move it back a step. If it feels too easy, stretch the gap.

Recall beats re-reading

Spacing works best together with active recall. Don't just look at the word and its translation; cover the answer and try to retrieve it. The slight struggle is what strengthens the memory. This is why flashcards and game-like quizzes work better than highlighting a list.

Doing it without software

A paper method (often called a box system) works: use several boxes, move cards forward when you get them right and back when you get them wrong, and review the earlier boxes more often. It is effective, though it takes some admin.

Letting an app help

Apps can carry out the scheduling for you. In LingFit, spaced review shows up in a few natural ways: the saved-words shelf lets you practise your bookmarked words as vocab cards whenever you like, and games like Flash, Ping-Pong and Tug-of-War test recall of vocabulary in a lively format. You can pair this with the main course, which revisits language across its 60 chapters. Take a look at lingfit.app.

Whatever tool you use, the principle is the same: return to words repeatedly across days and weeks rather than minutes.

Space your skills, not only your words

Spacing applies to more than flashcards:

Grammar: revisit a topic two days later with new examples.
Listening: rewatch a video clip after a few days and compare how much you now catch.
Reading: reread an easy story a week later.

Because easy-language stories and videos feel different the second time, they function as pleasant forms of spaced review.

Common mistakes

Reviewing everything every day, which wastes time on words you know.
Never reviewing old words, so they disappear.
Skipping the retrieval attempt and peeking at the answer.
Adding far too many new words per day, so reviews pile up.

A good rule is to add new words only as fast as you can review them.

How many new words per day?

If you are reviewing, five to ten new words a day is sustainable for many people. If your daily review takes longer than you have, reduce the new words until you catch up.

Signs your reviews are working

You will know spacing is working when words you once struggled with start to appear in your head without effort, when you recognise them in stories before checking, and when your daily review gets shorter even though your vocabulary is growing. If reviews feel endless, you are probably adding too many new words, so slow down. If they feel trivial, make the gaps longer and add more production practice.

FAQ

What is spaced repetition?

It is a study technique where you review material at increasing intervals, timed to when you would otherwise start forgetting it.

Does spaced repetition work for languages?

It is widely used for vocabulary because words are discrete items that benefit from repeated recall. It's less useful on its own for speaking skill, so combine it with practice.