Is there a good app for memorize with spaced repetition?
Fully Served: 5 apps already serve this, and 8 data points mined from real user reviews across 3 sources show where they fall short. Good apps already cover what people want. You'd need a strong wedge.
Data refreshed July 20, 2026 · scores recompute weekly as new reviews are mined, so re-check before you build.
What users complain about
The most common complaints behind apps that try to memorize with spaced repetition, mined and clustered from real reviews:
| Complaint area | Type | Mentions | What a user said |
|---|---|---|---|
| repetitive lessons | other | 2 | the lessons there’s like 40,000 repeat themselves |
| no spaced repetition | missing-feature | 1 | It has no spaced repetition system |
| not enough repetition to memorize words | missing-feature | 1 | it is also kinda hard to memorize the words i would like if you made more lessons with the same words |
| spaced review of prior lessons | missing-feature | 1 | nên để thêm bài tập luyện tập giúp ôn lại những gì đã học của các hôm trước |
| repetitive exercises | ux | 1 | the exercises are repetitive |
| question repetition without assistance | bug | 1 | question just kept repeating itself without any assistance |
| forgets context, requires repetition | reliability | 1 | You have to repeat your self a million times about anything in conversation |
Apps that already serve this
| App | Rating | Ratings | Price |
|---|---|---|---|
| NavsTMS | 4.2 | 58 | $4.99 |
| memoryOS: Memory Games | 4.9 | 13,946 | Free |
| Keymagine | 4.8 | 155 | Free |
| Foundations Memory Work C2 | 3.7 | 260 | $9.99 |
| Foundations Memory Work C3 | 3.6 | 167 | $9.99 |
Should you build it?
Good apps already cover what people want. You'd need a strong wedge. Opportunity here scores 20 out of 100 — a function of demand, how crowded the field is, and how badly the existing apps perform. Use the live map to compare it against adjacent tasks.
Who has tried building this
8 attempts, 6 dead, none over 41 stars; crowded with abandoned flashcard apps and no open-source contender near Anki.
| Project | Status | Stars | Stack |
|---|---|---|---|
| knsmr/reijiro | stale | 41 | Ruby |
| kirill-markin/flashcards-open-source-app | active | 19 | TypeScript |
| Skvayzer/LINS | stale | 9 | Java |
| mkeeter/states-machine | stale | 7 | C |
| rtrzebinski/simple-memorizer-4 | active | 7 | Go |
| sufftea/voca | stale | 3 | Dart |
| ahmad-hossain/quran-spaced-repetition-multiplatform | active | 2 | Kotlin |
| mohdasaadeh/brain-pocket | stale | 2 | JavaScript |
Open-source projects that attempted this task — active ones show today's bar; abandoned ones are a signal to validate why earlier attempts died.
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