Spaced Repetition (SM-2)
The proven SM-2 algorithm automatically schedules cards at the optimal moment — right before you forget them. Science-backed, not guesswork.
Spaced Repetition · Flashcards
Remember Everything Forever.
Memo uses the SM-2 spaced repetition algorithm to schedule reviews at the exact moment you need them. Learn languages, ace exams, master any subject — in 24 languages.
- SM-2 Algorithm
- 24 Languages
- Free to start
- Unlimited cards
4Review Ratings
365 daysMax Card Interval
3Study Modes
24Languages Supported
Everything You Need
Designed for deep recall
Every feature is built around one goal: helping you remember more with less time.
Beautiful Custom Decks
Create decks with 10 accent colors, 20 emoji icons, and custom descriptions. Your study space should feel like yours.
3D Flip Card Experience
Cards flip with a satisfying 3D animation. Front, back, hints — immersive study that keeps you engaged session after session.
Tags, Hints & Rich Content
Tag cards for easy filtering. Add hints that appear before the answer is revealed — perfect for guided recall and layered learning.
3 Intelligent Study Modes
Due Only (review overdue cards), All Cards (full deck practice), New Only (introduce fresh material). You control the pace.
24 Languages, Full RTL
Study in Arabic, Persian, Hebrew, Japanese, and 14 more languages. Fully RTL-aware UI — no awkward layouts for any script.
New in Memo
Study out loud. Import anything.
The tools serious learners asked for — free, and running right in your browser.
Free read-aloud
Your browser's own voices read every card, at the speed you choose. Listening mode lets you answer out loud, hands-free.
Import & export
Bring cards in from JSON, Markdown, CSV or TSV — add, update or replace — and export your decks whenever you like.
Markdown cards
Bold, lists, code and tables render on both sides of a card, with a live preview while you write.
Works with AI agents
Connect Claude or any MCP client and let it build decks, add cards and check your progress for you.
Study calendar
A year-long activity calendar shows every day you studied, so your streak is something you can see.
The Science
How spaced repetition works
The SM-2 algorithm was invented in 1987 by Piotr Woźniak and powers Anki — the world's most popular flashcard app. Memo brings this same engine to the web with a beautiful, distraction-free interface.
After reviewing a card you rate your recall. The algorithm adjusts the next review interval — easy cards wait longer, hard cards come back sooner. Over time you spend less time reviewing while retaining more.
Forgetting curveYou forget 50% of new info within a day without review.
Spaced learningReviewing just before forgetting doubles retention efficiency.
Good → next interval
1d → 6d → 15d → 38d → 95d → 238d → 365d
After you flip a card, rate yourself:
Simple Process
Start studying in 3 steps
No configuration needed. Create, add cards, and the algorithm takes care of the rest.
- 1
Create Your Deck
Name your deck, pick an accent color and emoji icon. Organize by subject — Japanese N5, Biology, System Design, anything.
- 2
Add Cards
Write the front (question/word/concept), back (answer), optional hint, and tags. Add as many as you need — no artificial limits.
- 3
Study & Let SRS Work
Flip each card, rate yourself (Again / Hard / Good / Easy) and the algorithm handles the rest. Come back tomorrow to review exactly what needs it.
Any Subject
What will you master?
Memo adapts to any learning domain — from Japanese vocabulary to medical pharmacology.
Language Learning
Master vocabulary, grammar rules, kanji, or verb conjugations with SRS. Used by JLPT, IELTS, HSK and DELF learners worldwide.
Example cards
- 犬Dog
- BonjourHello
- مرحباHello (Arabic)
Exam Preparation
Crush your next exam by reviewing definitions, formulas, dates, and concepts precisely when you need to. No wasted re-reads.
Example cards
- Mitosis vs MeiosisMitosis: 2 identical cells. Meiosis: 4 sex cells
- E = mc²Energy equals mass times speed of light squared
- Year of French Revolution1789
Medical & Science
Memorize drug interactions, anatomical terms, diagnostic criteria, and lab values. Built for high-density technical recall.
Example cards
- Hypoglycemia threshold< 70 mg/dL
- Cranial nerve VIIFacial nerve — controls facial muscles
- Metformin MOAInhibits hepatic gluconeogenesis (Complex I)
Programming & Tech
Remember algorithms, API signatures, design patterns, and system design concepts that slip away without practice.
Example cards
- Big-O of QuickSort (avg)O(n log n)
- SOLID — SSingle Responsibility Principle
- CAP TheoremConsistency, Availability, Partition Tolerance — pick 2
Personal Growth
Store quotes, lessons learned, book insights, and mental models you want to internalize — not just read once and forget.
Example cards
- Feynman TechniqueExplain a concept simply as if teaching a child
- Pareto Principle80% of results come from 20% of causes
- Locus of ControlInternal = believe you control outcomes
FAQ
Frequently Asked Questions
Is Memo free?
Yes, creating decks and studying with spaced repetition is completely free.
What is spaced repetition?
A learning technique that schedules reviews right before you're about to forget something, based on the SM-2 algorithm — it's proven to make long-term retention far more efficient than cramming.
What can I use Memo for?
Language learning, exam prep, coding concepts, professional certifications — anything you'd normally make flashcards for.
Can I create my own decks?
Yes, create custom decks with rich content and organize them however fits your studying.
Does it track my progress?
Yes, Memo tracks your learning progress over time so you can see how retention improves as you study.
Your brain deserves better than re-reading.
Start building decks today. The algorithm will remember what to show you and when — so you don't have to.
- Free to start, unlimited cards
- No credit card required
- 24 languages including RTL
- Science-backed SM-2 algorithm