Better than Quizlet, Anki, and Brainscape

The Last Study App
You'll Ever Need

Science-backed spaced repetition meets community collaboration and advanced AI.
Not a band-aid. Not overwhelming. Just perfect.

Science-Backed SM-2 Algorithm

Proven spaced repetition that actually works

Community-Driven Ecosystem

Rate decks, join groups, make friends while studying

AI Everywhere

Choose your model, control your credits, create from anything

Maximum Customization

9 game modes • 3 algorithm types • Full control

Start Learning Smarter

Available On

Access on
Web App

"Built as a passion project by CEO Nathan Wilson to study scripture with his dad. After trying Quizlet, Anki, and Brainscape without satisfaction, we set out to build the perfect memorization app— one that's science-backed, community-driven, and actually fun to use."

150K+
Active learners
50M+
Flashcards created
98%
Student success rate
4.9
Average rating
AI-Powered Creation

Create Flashcards in Seconds with AI

Three powerful ways to harness AI for instant flashcard creation. From raw notes to complete PDFs, transform any content into study-ready flashcards.

Convert Raw Notes

Paste your lecture notes, study guides, or any text content. AI intelligently extracts key concepts and creates focused flashcards.

  • 10-50,000 characters supported
  • Smart concept extraction
  • Up to 1,500 cards at once

Generate from Topic

Just describe what you want to learn. AI creates comprehensive, educational flashcards on any subject from scratch.

  • Any topic, any difficulty level
  • Educational and accurate content
  • Customizable depth and style

Import from PDF

Upload textbooks, research papers, or study guides. Advanced AI extracts and organizes information into structured flashcards.

  • PDFs up to 10MB
  • Smart chapter/section detection
  • Table data preservation

AI Assistance Everywhere You Need It

Beyond deck creation, AI helps you enhance cards, generate quiz questions, sort decks intelligently, and even assists during quiz games. It's integrated throughout your entire learning experience.

Enhance Cards
Improve grammar, add examples, create mnemonics
Smart Sorting
Sort decks by difficulty, topic, or importance
Quiz Generation
AI creates intelligent quiz questions with distractors
Study Hints
Get contextual hints during quiz games
Real Study Experience

Science-Backed SM-2 Algorithm

Experience the real flashcard component from the app. Tap to flip, rate your recall with the proven SM-2 spaced repetition system.

Real component from the app • Auto-playing demo

SM-2 Spaced Repetition

The oldest and most studied spaced repetition algorithm (published 1988). Proven to optimize long-term retention through scientifically-calculated review intervals.

  • New cards: Binary rating (Wrong/Correct)
  • Learning cards: 0-5 rating scale
  • Adaptive intervals based on your performance

Maximum Flexibility

3 algorithm types (Strict SM-2, Non-strict SM-2, Classic), custom fields with markdown and LaTeX support, and tap-to-flip mobile-first design.

  • Extra custom fields for context
  • Media support (images, audio, video)
  • Keyboard shortcuts for power users

Track Your Progress

Card status indicators (New, Learning, Mastered), detailed analytics, and community leaderboards to stay motivated and measure your growth.

Multiple Choice

Race against time • Build streaks • Real quiz experience

Auto-cycling through games • Click any tab to control

Build Epic Streaks

Chain correct answers to multiply your score. The longer your streak, the more points you earn!

Speed Bonuses

Answer faster to earn speed bonuses. Quick thinking = bigger rewards!

Compete on Leaderboards

Rise through the ranks and compete with friends for the top score!

9 Different Quiz Game Modes

Speed Truth is just one of 9 engaging quiz modes. Try Multiple Choice, Memory Grid, Matching, Fill the Gap, Word Puzzle, and more!

Speed Truth
Multiple Choice
Memory Grid
Matching
Fill the Gap
Type Master
Word Puzzle
Speed Review
Quiz Marathon

Built on Science, Powered by AI

Mentis follows the SM-2 algorithm more faithfully than any other app—combining decades of cognitive science research with cutting-edge AI to optimize your learning.

SuperMemo SM-2 Algorithm

The Gold Standard in Spaced Repetition

Created in 1987 by Piotr Woźniak, the SM-2 algorithm has been proven by millions of medical students, language learners, and academics worldwide. Unlike other apps that modify or "improve" the algorithm, Mentis implements it exactly as designed.

1

Initial Learning

Day 1 → Day 6: Build your foundation

2

Adaptive Intervals

Ease Factor (1.3-5.0) personalizes your schedule

3

Long-Term Retention

Cards can reach intervals of months or years

SM-2 Algorithm Visualization

Memory retention over time

30%
Mature at 9 days
70%
Elite at 180 days
100%
Mastered at 5 years

Strict Mode: Protecting Algorithm Integrity

When cards reach 30% mastery, Mentis automatically blurs them to prevent accidental preview. This protects the integrity of the SM-2 algorithm—if you see a card before you're scheduled to review it, you compromise your progress tracking.

"This level of faithfulness to the algorithm is what sets Mentis apart. Other apps let you peek at cards anytime, which defeats the purpose of spaced repetition."

Full Transparency, No Hidden Tricks

Unlike other apps that obscure their algorithms or manipulate intervals for engagement, Mentis shows you everything: your ease factor, next review date, interval length, and mastery score. You're in complete control.

Ease Factor2.5
Interval42 days
Mastery67%

Why SM-2 Works: The Science

Active Recall

Forcing your brain to retrieve information strengthens neural pathways far more than passive review. Every retrieval makes the memory stronger.

Spacing Effect

Distributing practice over time is dramatically more effective than cramming. SM-2 optimizes these intervals based on your performance.

Metacognition

The 0-5 quality rating helps you reflect on how well you know something. This self-assessment improves learning and guides the algorithm.

Compete with Confidence

Strict mode makes you leaderboard-eligible

Only users in Strict Mode can compete on leaderboards. This ensures fair competition—everyone is following the same rules, with the same card blurring and algorithm enforcement. No shortcuts, no cheating.

Group Leaderboards
Compete with classmates or study groups
Public Leaderboards
See how you rank globally
Quiz Leaderboards
Top scores in Blitz, Accuracy, and Marathon modes

Simple, Transparent Pricing

Start free, upgrade as you grow. No hidden fees, no surprises.

Free

$0
Forever free
50,000 AI credits/week
10 decks, 100 cards each
GPT-5 Nano model
SM-2 algorithm
Join 3 groups
Leaderboards
Get Started
Most Popular

Pro

$5.99
/month
or $59.99/year (save 17%)
500,000 AI credits/week (10x Free)
50 decks, 1,000 cards each
GPT-5 Nano + Mini
AI quiz games
Create groups
5GB media storage
Join 20 groups
Start Free Trial
Best Value

Premium

$19.99
/month
or $199.99/year (save 17%)
3,500,000 AI credits/week (70x Free)
Unlimited decks & cards
All AI models (GPT-5.1, Mini, Nano, O3)
AI quiz games
Unlimited groups
50GB media storage
Priority support
Start Free Trial

All plans include: Full SM-2 algorithm • Leaderboards • CSV import/export • Version control • Mobile apps (iOS & Android)

Credits reset weekly. Purchased credits never expire. Cancel anytime.

Frequently Asked Questions

Everything you need to know about Mentis

The SM-2 (SuperMemo 2) algorithm was created in 1987 by Piotr Woźniak and is the gold standard for spaced repetition. It calculates optimal review intervals based on your performance, ensuring you review cards just before you're likely to forget them. This scientifically proven method builds long-term memory far more effectively than traditional studying or cramming. Mentis implements SM-2 more faithfully than any other app, even blurring mature cards to protect the integrity of your progress tracking.
Unlike other flashcard apps, Mentis strictly follows the SM-2 algorithm without modifications or shortcuts. We blur mature cards to prevent accidental previews that would compromise your progress. We offer complete transparency—you see your ease factor, intervals, and mastery scores. We also give you control over AI models (choose from 4 different models), full CSV import/export, advanced version control for decks, and a community-driven deck ecosystem with proper attribution chains. Plus, we have 9 different quiz game modes and extensive collaboration features.
Strict Mode is our default study mode that follows the SM-2 algorithm exactly as designed. When cards reach 30% mastery (typically around 9 days of study), they're automatically blurred to prevent you from accidentally seeing them before your scheduled review. This protects the integrity of the algorithm—if you peek at a card early, it compromises your progress tracking. Strict Mode is also required for leaderboard eligibility, ensuring fair competition. You can switch to Non-Strict Mode if you want access to all cards anytime, but you'll lose leaderboard eligibility.
AI credits are our transparent pricing system for AI features. Each model has different costs (GPT-5 Nano is $0.05 per 1M input tokens, GPT-5 Mini is $0.25 per 1M input tokens, etc.). Before any AI operation, Mentis shows you the estimated credit cost so you can make an informed decision. Free users get 50,000 credits weekly, Pro users get 500,000 weekly, and Premium users get 3,500,000 weekly. Credits reset every week, and you can purchase additional credits that never expire. There are no hidden costs—you see exactly what you're paying for.
Yes! Mentis supports CSV import for up to 5,000 cards at once. You can map fields from your CSV to Mentis's structure (front, back, and 4 custom fields). We also support PDF import—upload a PDF and AI will generate flashcards from it. You can export your decks at any time to CSV or JSON format with full metadata, progress data, and version history.
Mentis offers: 1) Multiple Choice (AI-generated distractors), 2) Word Bank (fill-in-the-blank), 3) Matching (draw lines to connect pairs), 4) Memory Matrix (classic memory game), 5) Fill the Gap (type complete answers), 6) Speed Truth (lightning-fast true/false), 7) Type Master (typing accuracy game), 8) Word Puzzle (scramble/unscramble), and 9) Speed Review (rapid-fire review). Each mode has unique settings, power-ups, and scoring. Quiz results are tracked separately from your study progress, so you can have fun without compromising your SM-2 schedule.
When you join a deck created by someone else, you can link to it. When the original creator updates the deck, you receive a notification. You can then preview the changes and choose to accept (which updates your deck) or reject (which keeps your current version). You can also 'branch off'—convert the linked deck to your own personal version while maintaining the attribution chain. This way, if you publish your modified version, others can see it was based on the original creator's work. This system ensures proper credit and allows collaborative improvement of study materials.
Absolutely! Mentis has extensive group features. Create a group for your class, study group, or family. Groups can have public or private visibility, live chat, shared decks, group leaderboards, and role-based permissions (Owner, Admin, Member). Admins can manage content, approve new members, and moderate chat. Groups are perfect for classrooms, study groups, families, or any collaborative learning environment. Free users can join 3 groups, while Pro+ users can create and join up to 20 groups (Premium has unlimited).
Mentis is available on web (mentis-app.com), iOS (via App Store), and Android (via Play Store). All platforms sync seamlessly, so you can study on your phone, tablet, or computer. The mobile apps support offline study, biometric login (Face ID, Touch ID, fingerprint), native haptic feedback, push notifications, and platform-specific optimizations.
Leaderboards track your mastery progress or quiz scores. There are three types: Group Leaderboards (compete with your group), Public Leaderboards (global rankings on public decks), and Quiz Leaderboards (Blitz, Accuracy, and Marathon modes). To ensure fairness, only users in Strict Mode can compete on study leaderboards, and quiz leaderboards are version-locked (you only compete with users on the same deck version). You can opt out of leaderboards in your privacy settings.
Yes. Mentis is fully GDPR compliant. Your private decks are only visible to you unless you explicitly share them. You can export all your data at any time, and you can permanently delete your account if you choose. We use industry-standard encryption for passwords and sensitive data, JWT tokens for authentication, and refresh tokens stored securely. We never sell your data to third parties.
Yes, you can cancel anytime with no penalties. If you cancel, you'll retain Pro/Premium access until the end of your billing period, then automatically revert to the Free tier. Your decks and progress are never deleted—you'll just be subject to Free tier limits (10 decks, 100 cards each, reduced AI credits). You can resubscribe at any time to regain full access.

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