The spaced repetition app
Build permanent
memory pathways
Most of what you learn today is gone within a week. Spaced gives everything you want to keep a 6-stage review roadmap, and reminds you at the exact moment a memory starts to fade.
The problem
Your brain is built
to forget
In 1885, the psychologist Hermann Ebbinghaus measured how quickly he forgot what he had just learned. The result became known as the forgetting curve: memory drops steeply in the first hours and days, then levels off at a small fraction of what you started with.
He also found the fix. Each time you actively recall something just as it starts to fade, the curve gets flatter, and the next review can wait longer. This is the spacing effect, one of the most robust findings in memory research. Spaced turns it into a simple routine.
6
reviews per topic
365
days to mastery
5 min
per recall session
Retention over 30 days
How it works
One topic. Six recalls. Forever.
No decks to manage and no daily queue of hundreds of cards. Just a clear roadmap for each thing you want to keep.
01
Log it
Add a topic with a title and rich notes, or pick a ready-made set from the catalog.
02
Get your roadmap
Spaced instantly schedules six reviews across the next 365 days at your preferred time.
03
Recall on cue
When a stage is due you get a reminder. Recall it, mark it reviewed, and watch your mastery grow.
The roadmap
Your 365-day journey
Each stage unlocks on its exact due date. Recall early and it won't count, because the timing is the method.
- 1
Day 3
Immediate Reinforcement
Catch the memory before the steepest part of the curve.
- 2
Day 7
Short-term Recall
Lock it in while it still feels familiar.
- 3
Day 15
Pattern Recognition
Recall it from scratch and notice the patterns.
- 4
Day 30
Consolidation Stage
One month in, the memory gets consolidated.
- 5
Day 90
Long-term Integration
A quarter later, it has become part of what you know.
- 6
Day 365
Permanent Mastery
One year on, it's yours for good.
Use cases
For anything worth remembering
Students & exams
Turn a semester of lectures into knowledge that's still there on exam day, without cramming the night before.
Language learners
Vocabulary, grammar rules, idioms. Log the words you meet and review each one just before you'd lose it.
Professionals
Certifications, frameworks, client names, product specs. Keep the details sharp long after the training ends.
Medicine & law
Drug classes, anatomy, case law. High-stakes facts you can't afford to half-remember.
The curious mind
Capitals, currencies, world religions, cognitive biases. The trivia and wisdom you always wanted to keep.
Readers
Save the one big idea from every book you finish, and actually remember it next year.
“
I once knew the capital of every country in the world. A few months later I couldn't tell you the capital of Burkina Faso. That's when I stopped blaming my memory and started studying it.
— Pawan Subedi, maker of Spaced
Why Spaced exists
Built out of frustration
There were facts I wanted to carry for the rest of my life, and I kept losing them. Spaced started as a personal experiment to stop forgetting, and became the tool I wish I'd had at school.
Read the full storyCatalog
Start with a ready-made set
Curated study sets you can add to your roadmaps in one tap.
500 C1/C2 English Words
Advanced English vocabulary words with meanings for advanced learners.
652 topics · Hard
Countries Capitals
Master capitals of all the countries around the globe by continents.
195 topics · Medium
Countries Currencies
Learn the official currencies used in countries across the world.
195 topics · Medium
Countries Official Languages
Memorize the native and official languages of different countries.
195 topics · Medium
Major World Religions
Explore the founders and sacred texts of the world's major faiths.
12 topics · Medium
Popular Logical Fallacies
Learn to identify bad reasoning and flawed arguments.
15 topics · Hard
Popular Cognitive Biases
Understand psychological mental shortcuts that cloud logic.
25 topics · Hard
Stoicism Pillars
Practical wisdom and daily psychological tools from Stoicism.
15 topics · Easy
Everything you need
Simple by design
Automatic roadmaps
Every topic gets a 6-stage, 365-day schedule the moment you save it.
Smart reminders
Push notifications on Android, and browser alerts on the web, at your preferred time.
Web + Android sync
One account. Add on your laptop, review on your phone. Deletes sync everywhere too.
Rich notes
Bold, italics, underline and bullet lists, so you can capture exactly what you need to recall.
Streaks & history
A daily streak, a full learning log and a mastery ring for every topic.
Ready-made catalog
Eight curated sets, from 195 world capitals to 500 C1/C2 English words.
Your data, exportable
Download everything as JSON whenever you like. No lock-in.
Light & dark
A calm sand-coloured light theme and a deep-space dark theme.
Spaced for Android
Persistent, high-priority reminders that fire right on time, even when the app is closed.
Get it onGoogle PlaySpaced for the web
Plan and add topics from your keyboard, review anywhere. Same account, same roadmaps.
Open spaced.pageQuestions
What is spaced repetition?+
It's a learning technique where you review information at increasing intervals. Every time you successfully recall something just as you're about to forget it, the memory becomes more durable and the next review can wait longer. It's one of the most replicated findings in learning science.
Why 3, 7, 15, 30, 90 and 365 days?+
The gaps grow roughly in step with how memory strengthens after each successful recall. Early reviews come quickly, while the memory is fragile; later ones are far apart, once it's stable. Six reviews over a year is enough to move most facts into long-term memory, without the daily grind of a flashcard queue.
Is Spaced free?+
Yes. The Android app and the web app are free to use.
Does the web app sync with my Android app?+
Yes. Sign in with the same email or Google account and your roadmaps, reviews, categories and history are the same everywhere. Changes made offline sync once the device is back online.
Why can't I mark a review early?+
Because the timing is the method. Recalling something before it's due feels good but does much less for long-term retention. Spaced unlocks each stage on its exact due date.
How do web reminders work?+
Allow browser notifications and Spaced will alert you when a review becomes due, as long as spaced.page is open in a tab, even a background one. For reminders when your computer is off, use the Android app.
Stop relearning.
Start remembering.
Add the first thing you never want to forget. It takes ten seconds.