Build German vocabulary with spaced repetition
Last updated 2 June 2026
Spaced repetition is the most efficient way to remember vocabulary: it brings a word back just before you would forget it, so each review counts. KLUG builds German vocabulary this way and then lets you use the words in on-device AI conversations, which is what turns recognition into recall.
Why spaced repetition works
Reviewing a word once does little; reviewing it at growing intervals, right as it starts to fade, locks it in with far less total effort. KLUG schedules vocabulary reviews on this principle, so your time goes to the words you are about to forget rather than the ones you already know.
Words you can actually use
Recognizing a word on a card is not the same as reaching for it in speech. KLUG pairs spaced-repetition review with on-device AI conversations, where you have to produce the word yourself, in context. Vocabulary is taught in German across a full A1 course of roughly 1,200 core words. KLUG runs on iPhone and iPad and is free to start, with no third-party ads or tracking, though free sessions show KLUG's own occasional upgrade prompt.
How it compares
| What helps memory | KLUG | Plain flashcards |
|---|---|---|
| Spaced-repetition scheduling | Yes | Varies |
| Use the word in conversation | Yes, on-device AI | No |
| Taught in German, in context | Yes | Often via your language |
| No third-party ads or tracking | Yes | Common |
| Free to start | Yes | Varies |
Frequently asked questions
What is spaced repetition?
A review schedule that brings a word back just before you would forget it, at growing intervals. It locks vocabulary in with much less total effort than flat repetition.
How does KLUG help me remember words?
It schedules vocabulary reviews with spaced repetition and then has you use the words in on-device AI conversations, which turns recognition into recall.
How many words does the A1 course cover?
Roughly 1,200 core words, the vocabulary you need for the A1 level, taught in German and in context.
Is KLUG free?
KLUG is free to download and start, with no third-party ads or tracking, though free sessions show KLUG's own occasional upgrade prompt. Full access is an optional subscription at 7.99 EUR per month or 59.99 EUR per year.