Spaced repetition for language learning

English is not my first language. I learned it as an adult, mostly on my own, and the single technique that moved the needle more than any other was spaced repetition for vocabulary. So this guide is half method, half what actually worked for me.

Language learning is the textbook case for spacing because vocabulary is made of thousands of small, discrete facts, and discrete facts are exactly what a review schedule handles well.

Why vocabulary fits spaced repetition so well

The shape of forgetting is steep. The forgetting curve shows that a word you learn today is mostly gone within days unless it comes back. Vocabulary is the purest version of this problem: a word either surfaces when you need it or it does not, and whether it surfaces depends almost entirely on how often you have retrieved it.

That is why the spacing effect is so reliable here. Review a word the day after you meet it, again a few days later, again the next week, and it quietly becomes permanent. The intervals do the work; you just have to show up for the short reviews.

What to put on a card, and what to leave off

The most common mistake is overloading the card. A card is not a dictionary entry. It is one prompt and one answer.

Three rules that saved me a lot of wasted reviews:

• One word or phrase per card, not a list. Lists let you recognize the answer by position instead of recalling it.
• Prefer a short example sentence over a bare translation. You are learning how the word behaves, not just what it maps to.
• Add a card only for words you have actually met in context. Pre-loading a frequency list of words you have never seen produces reviews that feel like a chore and rarely stick.

The point is to make each review a genuine act of retrieval. If you can answer by recognition, the card is too easy to be teaching you anything.

The rhythm that actually held

The exact intervals matter less than the fact that they grow and that you do not stack everything on one day. A simple expanding rhythm (a day later, a few days later, a week, a few weeks, a few months) is enough for almost all vocabulary.

What broke the habit for me, repeatedly, was not the intervals. It was volume. When I added a hundred words in a burst, the reviews collided weeks later and I quit. The fix was a daily cap, which is its own topic: see spaced repetition without the burnout. A steady ten or twenty reviews a day, sustained for months, beats a heroic session you abandon by Thursday.

Beyond single words

Vocabulary is where spacing shines, but it is not the whole of a language. Grammar patterns, common collocations, and listening practice do not compress neatly into flashcards, and forcing them onto cards usually fails.

This is where I stopped trying to put everything into a flashcard app. The cards held my vocabulary; a planner held everything else (the grammar chapter to revisit, the podcast episode to relisten, the article to reread) on the same kind of growing schedule. Pairing retrieval-style cards with a broader review plan is how the pieces of a language actually stay learned.

That split is exactly what I built Memset around: it does not replace your vocabulary cards, it sits above them and tells you what to revisit today, words and everything else alike. If you are learning a language and losing track of what to review, that is the gap it is meant to close.