Best Free Spaced Repetition Apps for iOS in 2026
Stop paying for study tools you don't need. Here are the top free spaced repetition apps on iOS that actually work.
Spaced repetition is the most efficient study method known to science. Backed by over 100 years of peer-reviewed research, it can improve long-term retention by up to 200% compared to traditional study methods. But finding the right app—especially a free one on iOS—can feel like searching for a needle in a haystack.
I've tested dozens of spaced repetition apps on my iPhone and iPad. Some are expensive. Some are clunky. Some are just plain bad. But a few stand out as genuinely useful—and completely free.
In this guide, I'll walk you through the best free spaced repetition apps for iOS in 2026. Whether you're a medical student cramming for Step 1, a language learner building vocabulary, or a programmer mastering APIs, there's a free app here for you.
What Is Spaced Repetition and Why Does It Work?
Spaced repetition is a learning technique where you review information at increasing intervals over time. Instead of cramming everything in one session, you space out your reviews—just as you're about to forget the material.
The science is clear: users who consistently use spaced repetition apps retain 80% of studied material after 30 days, compared to just 20% with massed practice. The key is that your brain is forced to actively recall information, strengthening neural pathways each time.
For a deeper dive, check out our guide on what spaced repetition is and how it works.
Quick Answer: Best Free Spaced Repetition Apps for iOS 2026
The best free app depends on your needs:
- Anki — Best for power users and medical students (free via AnkiWeb, paid iOS app)
- RemNote — Best for note-taking + flashcards in one app (generous free tier)
- Mochi — Best for simplicity and clean UI (freemium with solid free features)
- Brainscape — Best for pre-made decks and confidence-based repetition (free with limits)
- Quizlet — Best for collaborative studying and gamified learning (free tier available)
Free Spaced Repetition Apps for iOS: Feature Comparison
Here's a side-by-side comparison of the top free spaced repetition apps available on iOS in 2026. I've rated each on algorithm quality, UI/UX, sync capabilities, and multimedia support.
| App | Algorithm | UI/UX | Sync | Multimedia | Free Tier |
|---|---|---|---|---|---|
| SpaceRep | ✅ SM-2 + FSRS | ✅ Modern, hand-drawn | ✅ Google Calendar | ✅ Images, audio, video | ✅ Free during beta |
| Anki | ✅ SM-2 + FSRS | ❌ Dated, complex | ✅ Free via AnkiWeb | ✅ Extensive | ⚠️ iOS app costs $24.99 |
| RemNote | ✅ SM-2 variant | ✅ Clean, modern | ✅ Free sync | ✅ Images, PDFs | ✅ Generous free tier |
| Mochi | ✅ SM-2 | ✅ Minimalist | ⚠️ Limited on free | ✅ Images, audio | ⚠️ 100 cards free |
| Brainscape | ✅ Confidence-based | ✅ User-friendly | ✅ Free sync | ✅ Images, audio | ⚠️ Limited decks |
| Quizlet | ⚠️ Simple repetition | ✅ Gamified, fun | ✅ Free sync | ✅ Images, audio | ✅ Ads-supported |
1. Anki — The Gold Standard (With a Catch)
Anki is the undisputed king of spaced repetition. It's used by medical students, language learners, and professionals worldwide. The algorithm is top-tier—it uses SM-2 and now supports FSRS (Free Spaced Repetition Scheduler) for even more efficient scheduling.
The catch: The official iOS app costs $24.99. However, you can use AnkiWeb for free on your iPhone's Safari browser. It's not as smooth as a native app, but it works perfectly for reviewing cards on the go.
Best for: Power users, medical students, and anyone who needs maximum control over their study algorithm.
Free tier limitations: The web version lacks offline access and some advanced features. If you want the full experience, you'll need to pay.
2. RemNote — The Note-Taking Powerhouse
RemNote combines note-taking with spaced repetition in a way that feels natural. You take notes, and RemNote automatically generates flashcards from them. It's like having a study assistant built into your note-taking app.
The free tier is generous: you get unlimited notes, flashcards, and sync across devices. The paid tier adds AI-powered features like automatic flashcard generation from PDFs.
Best for: Students who take lots of notes and want flashcards created automatically.
Free tier limitations: Limited to 5 PDF uploads per month and no AI features.
3. Mochi — Minimalist and Beautiful
Mochi is the app I wish existed years ago. It's clean, fast, and a joy to use. The interface is minimalist—no clutter, no distractions. Just you and your cards.
The free tier gives you 100 cards, which is enough to try it out. If you like it, the paid tier ($5/month) unlocks unlimited cards and sync across devices.
Best for: People who value design and simplicity over raw power.
Free tier limitations: Only 100 cards. You'll need to upgrade for serious studying.
4. Brainscape — Confidence-Based Learning
Brainscape uses a unique "confidence-based repetition" system. Instead of a fixed algorithm, you rate how confident you are in each answer. The app then schedules reviews based on your confidence level.
The free tier gives you access to a limited number of pre-made decks. You can create your own decks, but the free version caps the number of cards.
Best for: Learners who want pre-made, high-quality decks for specific subjects.
Free tier limitations: Limited decks and cards. Paid version unlocks everything.
5. Quizlet — Gamified Learning for Everyone
Quizlet is more of a "gamified" flashcard app than a pure spaced repetition tool. Its algorithm is less efficient than Anki's, but it makes studying fun with games like Match and Gravity.
The free tier includes ads but gives you access to millions of pre-made decks. You can also create your own decks with images and audio.
Best for: Casual learners, collaborative studying, and subjects with lots of pre-made content.
Free tier limitations: Ads, limited study modes, and no offline access.
How to Choose the Right Free Spaced Repetition App for You
Choosing the right app depends on your study goals and habits. Here's a quick guide:
- Medical students: Anki (via AnkiWeb) or SpaceRep for calendar integration
- Language learners: Anki for vocabulary or Brainscape for pre-made language decks
- Programmers: RemNote for note-taking + flashcards or Mochi for simplicity
- Law students: SpaceRep for schedule-aware studying or Anki for case law
- Casual learners: Quizlet for fun or Brainscape for structured learning
For a more detailed comparison, check out our complete guide to the best spaced repetition apps.
Frequently Asked Questions About Free Spaced Repetition Apps on iOS
What is the best free spaced repetition app for iOS in 2026?
The best free app depends on your needs. Anki (via AnkiWeb) offers the most powerful algorithm for free, while RemNote provides a generous free tier with note-taking integration. For a fully free experience with no paid upgrades, use AnkiWeb on your iPhone's Safari browser.
Are there any completely free spaced repetition apps without in-app purchases?
Yes. AnkiWeb is completely free to use in any browser, including Safari on iOS. Brainscape and Quizlet also offer free basic functionality without requiring purchases, though they include ads and limited features.
Can I sync my spaced repetition app across multiple devices for free?
Anki offers free syncing via AnkiWeb, but the iOS app itself costs money. RemNote and Quizlet also provide free syncing across devices with some limitations on the free tier. SpaceRep offers free syncing during its beta period.
Which free spaced repetition app is best for medical students on iOS?
Anki remains the gold standard for medical students due to its extensive shared decks and customizable algorithm. The free web version works on iOS, but the official app requires a one-time purchase. SpaceRep is a strong alternative with built-in calendar integration for rotation schedules.
How do free spaced repetition apps compare to paid ones in terms of effectiveness?
Free apps like Anki and RemNote use the same core spaced repetition algorithms as paid apps, so effectiveness is comparable. Paid apps often offer better UI, customer support, and advanced features like AI-generated cards. The algorithm itself is what matters most, and free apps deliver that.
Future Trends in Free Spaced Repetition Apps for iOS
The spaced repetition app market is evolving rapidly. Here are the trends I'm watching in 2026:
- AI-powered card generation: Apps like RemNote are already using AI to automatically generate flashcards from notes and PDFs. Expect this to become standard in free tiers.
- Gamification: More apps are adding game-like elements to keep users engaged. Quizlet leads here, but others are following.
- Cross-platform integration: Apps are increasingly integrating with calendars, note-taking tools, and learning management systems. SpaceRep's Google Calendar sync is a great example.
- Better algorithms: FSRS is becoming the new standard, offering more efficient scheduling than SM-2. Free apps are adopting it quickly.
The global spaced repetition software market is expected to grow at a CAGR of 15% from 2024 to 2030. This means more innovation, more features, and more free options for users.
Ready to Try the Best Free Spaced Repetition App?
Stop juggling multiple study apps. SpaceRep combines flashcards, focus timers, and calendar sync in one beautiful, free platform.
Start SpaceRep FreeFree during beta. No credit card required.