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The study companion that forgets with you

Teach your notes to Lumi. You’re the one who remembers.

Lumi is a study app for iPhone. You teach it your notes as text, a photo, a PDF or by voice. It forgets over time like a real brain, then quizzes you right before you forget too.

Try it in your browser

On iPhone. Free to start, no ads.

Coming soon on theApp Store
Lumi’s home screen on an iPhone, its room lit by a desk lamp
Lumi, a small living flame, waving hello
Lumi, a small smiling flame, reads an open book on top of a hill at dusk
Lumi learns what you explain to it. The more it remembers, the brighter its flame.

Pick your first subject.

A study card, a fill in the blank question. Answer right and Lumi lights up again. Everything happens in your browser, no account.

study-card.txt

History · teach this card to Lumi

In 1066 William of Normandy won the Battle of Hastings. The Magna Carta was sealed by King John in 1215. The Black Death reached England in 1348. Henry VIII broke with Rome through the Act of Supremacy in 1534.

Lumi’s question

In _____ William of Normandy won the Battle of Hastings.

Pick the missing word

1 / 4
History, method and flashcards
Preview

Answer right to light Lumi up

Its lamp fades when a fact slips away.

Everything you need to study

You teach, Lumi forgets, then it comes back at the right moment.

  • Snap your notes

    A handwritten or printed page is enough. Lumi finds the key facts and writes its questions. Photos stay free.

    How to make flashcards

  • It forgets, like you

    Lumi forgets a little every day, following the forgetting curve. Its room gets darker as facts fade.

    The forgetting curve

  • It quizzes you

    Right before you forget, Lumi asks its questions. Pulling an answer back builds more memory than rereading.

    Active recall

  • It gets things wrong on purpose

    Sometimes Lumi offers a wrong answer. You correct it, and you are the one who remembers, like explaining to a friend.

    The protégé effect

  • One reminder, in the evening

    At most one reminder a day, at the time you pick, never at night. You can turn it off.

    Spaced repetition

  • A light that grows

    From night light to lighthouse, Lumi’s lamp grows with what it remembers. Every fact mastered lights a star.

    See the plans

  • The Mist, the night before the exam

    The night before a test, the Mist of forgetting rises over your sky. Every right answer pushes it back.

    Plan your revision

What the science measures.

Lumi’s methods are the best rated by the research, with figures and sources to back them up.

Study

Rereading feels like knowing. Testing yourself makes it stick.

61%

of the ideas in a text remembered one week later by students who read it once, then tested themselves three times

40%

for students who reread the same text four times

52% vs 14%

forgotten within a week, rereading versus self testing

The trap, rereaders felt the most confident. They forgot 52% within a week, against 14% for those who tested themselves.

Roediger and Karpicke, Psychological Science, 2006, experiment 2, 120 students.
All the science behind Lumi

Choose your plan

Free to start. Pro for your whole programme.

Free

€0forever

 

  • Photos and dictation
  • 3 cards a week
  • Lumi’s questions
  • The Mist on your next exam
  • No ads
Start for free

Lumi Pro monthly

€4.99a month

 

  • No weekly card limit
  • The Mist on every chapter
  • Your whole programme before the exam
  • Cancel anytime
Coming soon
7 days free

Lumi Pro yearly

€29.99a year

That is €2.50 a month

  • All of Lumi Pro
  • 7 day free trial
  • A reminder two days before the trial ends
  • Cancel in your iPhone settings
Coming soon

Planned launch prices in euros. The App Store shows the price for your country.

Frequently asked questions

Short answers, before you start.

What is Lumi?
Lumi is a study app for iPhone shaped like a companion. You teach it your notes, it forgets over time, and it quizzes you at the right moment. It’s active recall and spaced repetition, dressed up as a little tamagotchi.
Why teach my notes to someone else?
Because you remember better what you explain. Students who expected to teach a text recalled it more completely and in a better organized way (Nestojko et al., 2014). With Lumi, you teach, it sometimes gets things wrong on purpose, and you correct it.
When does the app come out?
Lumi is coming soon to the App Store, on iPhone. The button on this site will link to it as soon as it’s live.
How much does it cost?
Lumi is free with 3 cards a week, photos, voice and questions. Lumi Pro is €29.99 a year, that’s €2.50 a month, or €4.99 a month, with a 7 day trial on the yearly plan. The App Store shows your local price.
What happens to the notes I give Lumi?
If you agree, the photo, PDF or text goes to Google’s Gemini through our server, for the time it takes to write the questions. We don’t keep your notes once the reading is done, and they train no model.
Will Lumi send me notifications all day?
No. One reminder a day at most, at the time you choose, and never at night. You can turn it off.
How old do I need to be?
Lumi is for people aged 18 and over. The app checks your birth month and year, on your phone.

Go further

Study smarter, subject by subject

Study guidesForgetting curve, spaced repetition, active recall. Every guide cites its studies.By subjectHow to turn your subject into cards, with an example card you can try.By levelHigh school, AP, SAT, MCAT, GCSE, A-levels, and the French and Spanish systems too.

Lumi is waiting to study with you

Teach it your first card tonight.

Coming soon on theApp StoreFree with 3 cards a week. No ads.