Spaced repetition apps use algorithms to show you information right before you’re about to forget it — here’s how the top options compare

If you’ve ever crammed for an exam and forgotten everything two days later, you’ve experienced the forgetting curve firsthand. Spaced repetition is the scientifically proven antidote — and the right app makes all the difference.

But with dozens of spaced repetition apps on the market, which one should you actually use? We tested the top 7 apps head-to-head to help you choose.

What Is Spaced Repetition?

Spaced repetition is a learning technique where you review information at gradually increasing intervals. It works because of a phenomenon first documented by German psychologist Hermann Ebbinghaus in 1885: we forget information in a predictable pattern, but each time we successfully recall it, the memory gets stronger and lasts longer.

A good spaced repetition app automates this process: it tracks when you last reviewed each piece of information, calculates when you’re about to forget it, and shows it to you at the optimal moment.

The 7 Best Spaced Repetition Apps — Head to Head

1. Anki

Best for: Power users, medical students, language learners who want full control

Anki is the gold standard of spaced repetition. It’s open-source, infinitely customizable, and uses a proven SM-2 algorithm. The desktop app is free; iOS costs $25 (one-time); Android app (AnkiDroid) is free.

2. Quizlet

Best for: Students who want a polished, social learning experience

Quizlet is the most popular flashcard app, with over 60 million monthly users. Its spaced repetition mode (“Learn”) is solid, though less sophisticated than Anki’s algorithm. Free tier available; Quizlet Plus ($7.99/month) adds advanced features.

3. RemNote

Best for: Knowledge workers who want notes + flashcards in one app

RemNote combines note-taking with automatic flashcard generation. Write your notes, highlight key terms, and RemNote automatically creates spaced repetition cards from them. The free tier is generous; Pro is $6/month.

4. SuperMemo

Best for: Spaced repetition purists who want the original algorithm

Created by Piotr Wozniak (who pioneered the SM-2 algorithm Anki uses), SuperMemo is the original spaced repetition software. Its latest algorithm (SM-18) is considered the most sophisticated. However, the interface is notoriously complex.

5. Memrise

Best for: Language learners who want video-based learning

Memrise uses spaced repetition combined with native speaker videos to teach languages. It’s more gamified than Anki and focuses heavily on vocabulary acquisition. Free tier available; Pro is $8.99/month.

6. Mochi

Best for: Minimalists who want a beautiful, distraction-free experience

Mochi is a markdown-based flashcard app with a clean, Notion-like interface. It supports bidirectional linking between cards and notes. Free with optional Pro features.

7.Brainscape

Best for: Certification prep and structured learning paths

Brainscape uses confidence-based repetition — you rate how confident you are in each answer, and the algorithm adjusts accordingly. It offers curated content for exams like MCAT, SAT, and professional certifications.

Feature Comparison Table

Which App Should You Choose?

But Here’s What Most People Miss

The best spaced repetition app is worthless if your flashcards are poorly designed. Research by Piotr Wozniak shows that how you create your cards matters more than which app you use.

The rules are simple:

1. One fact per card. Don’t cram multiple items onto one card.
2. Use mnemonics. Pair spaced repetition with memory techniques like the method of loci or keyword method for dramatically better results.
3. Add context. A card that says “What is ‘table’ in French?” is weak. “The waiter placed the wine glass on the _____ (la table)” is much stronger.
4. Review consistently. Even 10 minutes daily beats 2 hours once a week.