Whether you're learning a language or preparing for an exam, the single biggest efficiency gain in memorization comes from apps built around the forgetting curve. By scheduling each review right before a memory fades, spaced repetition gives you lasting retention that cramming never will.
One app drawing particular attention is Flips, a next-generation flashcard app that visualizes your memory with a color-coded forgetting gauge. In this article we compare Flips with the major spaced repetition apps of 2026 and recommend the best pick for each type of learner.
Bottom line: if you want the forgetting curve managed for you automatically, Flips is the easiest place to start — and every feature is free.
Forgetting curve apps at a glance
First, here is how the major apps compare on spaced repetition support, pricing, and platforms.
| App | Forgetting curve | Key features | Pricing | Platforms |
|---|---|---|---|---|
| Flips | ✅ Science-based algorithm | Forgetting gauge, streak calendar, multilingual | Free — all features | iOS / Android |
| Anki | ✅ Advanced (FSRS) | Deep customization, 50,000+ shared decks | Free on desktop / Android / web; iOS app $24.99 one-time | iOS / Android / PC |
| RemNote | ✅ Built-in spaced repetition | Notes and flashcards in one, PDF annotation | Free plan; Pro from about $8/month | iOS / Android / PC / Web |
| Quizlet | △ Partial | Huge shared library, many quiz modes | Free tier (limited); Plus $7.99/month or $35.99/year | iOS / Android / Web |
| Brainscape | ✅ Confidence-based repetition | Rate your confidence 1–5, curated classes | Free tier; Pro $19.99/month (about $7.99/month billed yearly) | iOS / Android / Web |
| Memrise | ✅ Spaced review (languages) | Native-speaker videos, AI conversation practice | Free tier; Pro subscription (annual around $99, promos common) | iOS / Android / Web |
| SuperMemo | ✅ The original SM algorithms | Incremental reading, decades of research | Paid desktop license; separate supermemo.com subscription | PC / Web / Mobile |
| Noji | ✅ Spaced repetition | Modern UI, AI card generation (formerly "AnkiPro") | Free tier; premium subscription | iOS / Android / Web |
Detailed reviews
Flips – scientific, beautiful, and completely free
Built on the concept of "flashcards that appear right before you forget," Flips puts the forgetting curve at the center of the experience. Its signature forgetting gauge shows each card's memory state in green, yellow, or red, so you can see at a glance which items are about to slip away. No more wondering what to review first — the app has already sorted it for you.
A GitHub-style streak calendar turns daily effort into a satisfying visual habit, and you can switch between flashcard mode and 4-choice quiz mode to keep sessions fresh. With CSV import and custom decks, Flips handles everything from vocabulary and professional certifications to medical terminology and trivia.
Every feature is completely free. Guided by the principle that money should never be a barrier to learning, Flips gives students and professionals alike the full power of an Ebbinghaus-based review algorithm that surfaces each card at the moment reviewing it matters most.
What people use Flips for
- Certifications: legal, finance, IT, and medical exam terminology
- Language learning: vocabulary and phrases in any language pair
- School and university: history dates, formulas, anatomy, case names
- Professional knowledge: drug names, standards, protocols
- Hobbies: art history, music theory, wine, birds — anything worth remembering
Feature highlights
- Forgetting gauge that prioritizes reviews visually
- Flashcard and 4-choice quiz modes
- GitHub-style streaks to keep the habit alive
- Official vocabulary decks plus CSV import
- Notifications and a timeline that manage review timing automatically
Try Flips today
See your memory on a gauge. Every feature free, no subscription.
Available for iOS / Android · No registration required
Anki – unmatched power, if you invest the time
The best-known name in spaced repetition, Anki offers enormous flexibility and a community library of over 50,000 shared decks covering medical school, language exams, and professional certifications. Recent versions add the modern FSRS scheduling algorithm. The trade-off is a steep learning curve and a dated interface — and while the desktop, Android, and web versions are free, the iOS app is a $24.99 one-time purchase.
RemNote – notes and flashcards in one place
RemNote merges note-taking with spaced repetition: write your notes, mark the key facts, and they become flashcards automatically scheduled for review. It's a favorite of university students who want lecture notes and reviews in a single tool. A capable free plan is available, with Pro from about $8 per month.
Quizlet – instant materials, limited free tier
Quizlet shines when you want ready-made study sets: search almost any textbook or topic and start studying in seconds, with matching games and practice tests to mix things up. True forgetting-curve scheduling is limited, though, and since 2022 the free tier caps its core Learn mode — the full experience requires Plus at $7.99/month (or $35.99/year).
Brainscape – rate your own confidence
Brainscape uses "confidence-based repetition": after each card you rate how well you knew the answer from 1 to 5, and the interval adjusts accordingly. Its catalog of professionally curated classes is a strong point for standardized tests. The free tier is workable; Pro runs $19.99/month, dropping to roughly $7.99/month when billed yearly.
Memrise – spaced repetition for language learners
Memrise applies spaced review specifically to language learning, pairing vocabulary drills with thousands of native-speaker video clips and AI conversation practice. If your only goal is a new language, its focused content is compelling; for general-purpose memorization, a flashcard app is the better fit. A free tier exists, with Pro sold as a subscription (annual plans around $99, frequent promotions).
SuperMemo – where the forgetting curve research began
SuperMemo is the original: its SM algorithms, developed since the 1980s, are the foundation that Anki and most other apps built upon. The desktop version offers unmatched depth — including incremental reading — but the interface is genuinely old-school, and the ecosystem (paid desktop license, separate supermemo.com courses) takes effort to navigate. For algorithm purists and power users.
Noji – a modern take (not affiliated with Anki)
Noji, formerly known as "AnkiPro," offers spaced repetition in a polished modern interface with AI card generation. Note the naming confusion: despite its former name, it has no connection to the original Anki project. A solid choice if you want something friendlier than Anki and don't need its ecosystem.
Best app by learner type
Just getting started
Best picks: Flips, Noji
Intuitive interfaces that let you start reviewing in minutes, not hours.
Power users who want control
Best picks: Anki, SuperMemo
Deep customization and battle-tested algorithms for those willing to learn the tools.
Studying from your own notes
Best picks: RemNote, Flips
Turn lecture notes and CSV lists into scheduled reviews without retyping everything.
Language learners
Best picks: Memrise, Flips, Quizlet
Rich audio-visual content or flexible custom decks for any language pair.
Keeping costs at zero
Best picks: Flips, Anki (non-iOS)
Full spaced repetition without a subscription — Flips is free everywhere, Anki outside iOS.
Motivated by visible progress
Best picks: Flips, Brainscape
Streaks, gauges, and confidence stats that make improvement feel tangible.
How to use the forgetting curve effectively
What is the forgetting curve?
The forgetting curve, discovered by German psychologist Hermann Ebbinghaus, describes how memory fades over time. Without review, we forget roughly 70% of new material within 24 hours — which is exactly why reviewing at the right moments, rather than more often, is what makes memorization efficient.
The review schedule that works
To make the forgetting curve work for you, the classic spacing looks like this:
- First review 1 day after learning
- Second review after 3 days
- Third review after 1 week
- Fourth review after 2 weeks
- Fifth review after 1 month
Forgetting-curve apps like Flips manage this cycle automatically and prompt you right before a memory fades. Nobody maintains a schedule like this by hand for hundreds of cards — letting the app do it is what makes the method sustainable.
Frequently asked questions
Q. Do forgetting curve apps actually work?
Yes. Studies on spaced repetition report retention improvements of roughly 3–5x compared to massed review (cramming). Combining it with active recall — testing yourself rather than rereading — accelerates the transfer to long-term memory even further.
Q. Is there a good free spaced repetition app?
Flips is completely free with all features included. Anki is free on desktop, Android, and the web (the iOS app is a $24.99 one-time purchase), and RemNote, Brainscape, and Noji all offer usable free tiers.
Q. Which app is best for language learning?
For structured courses with audio and video, Memrise is the specialist. For your own vocabulary lists — any language pair, your own examples — Flips and Quizlet offer the most flexibility.
Start studying scientifically with Flips
Reviews scheduled along the forgetting curve, right when they matter.
From language learning to professional exams — every feature free.
Summary
Forgetting curve apps turn a century of memory research into a daily habit that takes minutes. Flips stands out with its forgetting gauge, streaks, and genuinely free feature set, while Anki, RemNote, Quizlet, Brainscape, Memrise, SuperMemo, and Noji each serve a distinct kind of learner.
Build the habit of reviewing "right before you forget," and vocabulary, exam prep, and professional knowledge all start to stick. Pick the app that fits your style and experience what scheduled reviewing can do.