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Coming soon to Android and desktop

Everything your household owns, catalogued and shared.

Books, comics, board games, films, TV series, video games and music. Add it once and the whole household sees it, on phones and computers.

See downloadsHow sharing works

FreeNo account requiredNo ads

Kosmotheka on a computer: the Family library catalogue with music, films, board games, books, comics and video games, with the Carcassonne card open: 2 to 5 players, 35 minutes, ages 7 and up.Kosmotheka on a computer in dark mode: the Family library catalogue with the Carcassonne card open.
Kosmotheka on a phone: the Family catalogue with Abbey Road, Asterix the Gaul, Blade Runner 2049, Catan and Dune.Kosmotheka on a phone in dark mode: the Family catalogue.
Sound familiar?

Hundreds of things at home. The same questions every time.

Do we have that book?

You have itDune · in 2 libraries

Where’s Catan?

Study · cupboardBox, 2015 edition

What are we missing from that series?

Twin Peaks · you’re missing season 3You have seasons 1 and 2, on DVD

Kosmotheka keeps track of it all and shares it with your people. No spreadsheets, no group chats, no asking around.

Why it’s different

Made for home; the cloud, only if you want it.

01

No account, no internet

Everything is stored on your devices. An account is optional, keeps your libraries up to date from afar and, for now, is by invitation.

02

Shared at home

Phones and computers pair with a QR code and sync over your Wi-Fi, with no servers involved.

03

Several libraries

The family one, the role-playing club’s, your own. Each with its own people.

04

A role for everyone

Some people manage, some edit, and some just browse and ask for things to be added. Admins accept or decline.

05

Quick to add

Scan the ISBN or barcode and the details fill themselves in. Or search by title, or import your spreadsheet.

06

Do I have it?

Scan it in the bookshop or the store before you buy it twice.

07

The right details for each thing

Players and play time for a game, director for a film, seasons for a series. And series with their gaps: “I’m missing number 4”.

08

Everyone’s own notes

To read, reading, finished or dropped (or playing, watching…), stars, favourites and “I want this”.

What fits

The whole shelf. Each thing with its own details.

Tap anything on the shelf.

Book

Dune

Frank Herbert · 1965

Its details

AuthorPublisherISBNLanguagePaperback, ebook…

Yours

To readReadingFinishedDropped
Inside

Clear enough for everyone at home.

Add screen: with the ISBN scanned, the app picks Book and finds Dune by Frank Herbert. Add screen in dark mode: the app finds Dune by its ISBN. Do I have it? screen: “You have it”, Catan, in 2 libraries: Family and Role-playing. Do I have it? screen in dark mode: “You have it”, Catan, in 2 libraries. The Dune saga: you have 3 of 6; numbers 3 and 4 are missing and Hugo wants number 4. The Dune saga in dark mode, with its gaps. Dune card: finished, four stars and a favourite; two copies, paperback and Kindle. Dune card in dark mode: finished, four stars. People and roles in Family: Ana manages, Laura edits, Hugo and Carmen browse. People and roles in dark mode. Library switcher: Family, Role-playing, Hugo’s video games and Board games. Library switcher in dark mode.

Screens shown in Spanish; the app is also available in English.

Privacy

Your data is yours.

What you add stays on your devices. We never see it, because it never reaches us.

  • No adsNot now, not later.
  • No trackingNo analytics of ours, no cookies, in the app or on this site.
  • No account requiredOnly if you want your libraries up to date from afar. For now, the cloud is by invitation.
  • Backups whenever you likeKeep them wherever you prefer. And export to CSV.
  • Free softwareIt will be AGPL: the code, open for anyone to see.
  • Your own serverIf you fancy it, you’ll be able to run your own.
Read the privacy policy

Coming soon to your home.

Android is in testing and the desktop app, for Windows and Linux, is on its way. Free, no account, no ads.

See downloadsGet news on Bluesky