The library that works anywhere — and pays you back.

Koob is a book catalog built by the people who read from it. Organize the books
you own, track everything you read, and earn your way through the app by making
the catalog better for everyone after you. It all runs on your device, so it
keeps working with no signal at all.

BUILT TO WORK OFFLINE
Your whole library lives on your phone — every shelf, note, cover, and reading
session. No signal on the metro, in the stacks, or on a plane? Your shelves glow
on. Browse, edit, shelve, take notes, and log your reading exactly as you always
do. Everything you change offline queues up quietly and syncs itself the moment
you're back.

A CATALOG BUILT BY READERS
Scan a barcode and the book is yours — cover, author, and details filled in
automatically. And when a book isn't in the catalog yet, you don't hit a dead
end: add it yourself. Scan the spine, snap the cover, fill in what you know.
Once a reviewer accepts it, that book is in the catalog for good, and every
reader who comes looking for it finds it because of you.

EARN TOKENS FOR EVERY CONTRIBUTION
Accepted books earn tokens, with a bonus for adding a spine photo. Fix a typo,
add a missing cover, complete an entry — the work you put into the catalog comes
back to you. Prefer not to contribute? You can earn free tokens daily, and
Premium members get a monthly allowance.

SPEND THEM ON WHAT YOU NEED
Tokens unlock Super Search, which digs past our shelves into an extended
database to find the rare editions and obscure printings. Or put them toward
Koob+ premium months. Contribute enough and the app pays for itself.

COLLECT THE STAMP ALBUM
Your milestones aren't a checklist — they're issued as stamps in a real
collector's album, one series to a page. Each series climbs from bronze through
silver, gold, and platinum to diamond, and you can watch the next tier ink in as
you read toward it. Premium unlocks special series for your books, your genres,
and your bookcases.

ORGANIZE YOUR WAY
Create custom bookcases and shelves that mirror your real-life setup. Arrange
books exactly how you want them and find any title at a glance.

TRACK YOUR READING
Set goals by books or by pages, log your reading sessions, and watch your
progress build through the year. Your reading statistics show you exactly where
you stand.

TAKE PERSONAL NOTES
Jot down thoughts, favorite quotes, or reflections for any book. Your notes stay
private and stay with you, online or off.

READ ON EVERY DEVICE
Go Premium to sync your library across all your devices, so the collection you
build on one is waiting on the next.

Every book you add helps the next reader. Start building with Koob.