Lumlu
Drop in a book or PDF
Open a textbook, ebook, paper, or lecture slides. Read your way, highlight what matters, and listen with read-aloud.
Lumlu Reader
The best way to make reading stick.
Lumlu turns books and dense PDFs into flashcards and notes pulled straight from what you read, then brings each one back exactly when you're about to forget. Free forever, offline. Premium adds Sync · AI.
Free to start. Reader, notes, and spaced repetition work fully offline — no account needed.
Download for your computermacOS, Windows, and LinuxApp Store — soonGoogle Play — soon
Coming soon to the App Store and Google Play.
iOSAndroid macOSWindowsLinux
Why it works
Spaced repetition that works
On-device FSRS schedules each review just before you'd forget.
Source-anchored
Every card cites the exact page it came from.
Works offline
Free tier, no account — reader, cards, and study run with no signal.
Any subject, any language
Generation follows the language of what you're reading.
Spaced repetition powered by the open-source FSRS algorithm.
How it works
From a page you're staring at to a card you'll remember.
Three steps from a book or dense PDF to something you'll remember.
Capture flashcards & notes
Pick cards, key terms, a summary, or an explanation — grounded in what you selected.
Review until it sticks
Spaced repetition brings each card back right before you'd forget it. Rate Again, Hard, Good, or Easy, and the schedule adapts — weak spots get extra attention.
Features
When the card goes fuzzy, the page is still there.
The loop is simple. What holds is how study material stays tied to the page you were reading — and a reader built for learning, not just flipping.
Back to the page
Flashcards that quote the page they came from.
Lumlu writes flashcards, key terms, summaries, and explanations from exact quotes — and treats your highlights and notes the same. Every card and note anchors to its page and passage. When a detail slips, one tap puts you back on the source.
Exact quotesPage anchorsBack to source
Read your way
A reader built for learning, not just viewing.
Scroll or turn pages, Day or Night. Select any passage and the toolbar is there: highlight, note, make a card, or send it to AI study. When your eyes are done, read-aloud continues word by word — at your own pace.
Selection toolbarHighlights & notesRead-aloud
See it in action
Watch a page become a memory.
Real screens from Lumlu: read any PDF or ebook, highlight what matters, capture key passages, see your study hub, and review with spaced repetition.
Your libraryContinue reading or listen hands-free 
Read any PDF or ebookZoom and pan through dense pages 
Select a passageHighlight, note, card — or study with AI 
Highlight as you goMark what matters with color and notes 
Your study hubAll cards and notes from the document 
Review when it countsSpaced repetition brings cards back before you forget
The same study loop, on a bigger screen.
Select a passageHighlight, note, card — on your computer 
Your study hubThe same cards and notes from the document
Free for everyone
Send study sets to a classmate — not a marketplace.
Share flashcards and notes from your library with a file package or an anyone-with-the-link Share link. Recipients import into Lumlu and study offline. Your book or PDF file is never uploaded with a link; progress stays private.
Handoff is free. Premium is Sync and a higher daily AI allowance — not “can share.”
A study shelf in Lumlu — a set like this is what a handoff packages: cards and notes, with the book or PDF only in a local file package.
Plans
Free is a complete study app. Premium is Sync and daily AI.
Stay on Free as long as you like. Yearly Premium is for the same library on every device, and AI that can keep up with a study week.
Always free
Free
A complete study app. Offline, no account.
- Full reader for PDFs and ebooks — highlights, notes, read-aloud
- Your own flashcards and notes
- Spaced repetition that works fully offline
- Send or receive study sets by file or link — free for everyone
- AI to try: 5 credits on this device, 10 more when you sign in, then 5 each month
No account required. Works start to finish without the cloud.
Premium
Save 25% yearlySync · AI
Everything in Free, plus
- Cloud backup and sync — the same library and progress on every device
- Higher daily AI — around 30 generations a day, so a study week does not run dry
You'll choose monthly or yearly at checkout.
Prices shown in USD. Premium is one subscription — monthly or yearly. Checkout is the App Store, Google Play, or Stripe on desktop. A store or desktop checkout may show a local price.
Get Lumlu
Your free study app is ready.
Offline reader, cards, and spaced repetition — free, no account needed. Install it on your computer now; the phone apps follow. Premium is Sync and a higher daily AI allowance only if you want them.
Download for your computer
macOSTwo builds — pick your Mac
WindowsTwo builds — pick your processor
LinuxTwo builds — pick your processor
Which build do I need?
- macOS
- Open the Apple menu → About This Mac. A Chip line means Apple silicon; a Processor line means Intel.
- Windows
- Open Settings → System → About and read System type. “ARM-based processor” is the Arm build — that includes Copilot+ PCs with a Snapdragon chip. “x64-based processor” is Intel or AMD. The Arm build runs natively and uses less battery; the Intel or AMD build also runs on Arm, but emulated and slower.
- Linux
- Run uname -m in a terminal. x86_64 or amd64 is Intel or AMD; aarch64 or arm64 is Arm.
The same Lumlu. Premium on desktop is desktop checkout — one subscription. Sync when you're signed in.
App Store — soonGoogle Play — soon
Coming soon to the App Store and Google Play.
Free to start. Works offline. No account needed.