What I Already Own vs Gleeph: which app to manage your library?
Gleeph is a free French app that combines a library with a network of readers: scanning, shelves, reviews, suggestions. What I Already Own is a paid app for a collector’s inventory: the exact edition, what each series is missing, your records alongside your books, and your data exportable at any time.
Facts current as of September 29, 2026, taken from the publishers’ official pages, numbered and dated at the bottom of the page.
Scanning is free. At your first add: 7-day trial at €0, card required, then €3.95 a month or €39.95 a year, cancel anytime. Your collection stays exportable.
In short
Choose Gleeph if you want a free library, reviews and suggestions from readers like you, and a way to reserve your books at a bookstore. Choose What I Already Own if you keep an inventory of a collection: every edition, the volumes you’re missing, your records in the same app, on your phone and your computer, with self-service export.
Side by side
| Criterion | What I Already Own | Gleeph |
|---|---|---|
| Price | What I Already Own€3.95 a month or €39.95 a year, tax included, after a 7-day trial. Books and records included. | GleephFree. Premium subscription at €1.99 a month, for reading analytics. 1 2 |
| Platforms | What I Already OwnAn app that installs on iPhone and Android from the browser, without the App Store or Google Play. On a computer, in the browser. | GleephiOS and Android apps. 1 3 |
| Barcode scanning | What I Already OwnWith the camera; when one barcode covers several editions, you pick yours. No barcode? Search by title. | GleephThe barcode on the back cover, with the camera. 1 3 |
| What you can catalog | What I Already OwnBooks and records (vinyl, CDs, cassettes). | GleephBooks, including comics and manga. 1 |
| Reader community | What I Already OwnNo. A private share link, with your wishlist if you like. | GleephYes: reviews, news feed, daily suggestions, other readers’ libraries. 1 3 |
| Bookstores | What I Already OwnNo. | GleephGleeph shows nearby bookstores that have the book and offers to reserve it. 1 3 |
| Market value | What I Already OwnNo market value shown at this time. You can record the price paid and the selling price. | GleephNo market value mentioned. 1 3 |
| Offline | What I Already OwnThe app knows without a signal whether you already own a book; scans made offline are processed once you’re back online. | GleephNo offline mode mentioned in the app descriptions. 1 3 |
| Export | What I Already OwnCSV file and PDF inventory, at any time from the settings, even without a subscription. | GleephOn request by email, according to the publisher’s reply to an App Store review. 1 |
| Languages | What I Already OwnEnglish, French, German, Italian, Spanish and Japanese. | GleephFrench and two other languages, according to the App Store. 1 |
What Gleeph does better
How What I Already Own is different
- Your records too. Vinyl, CDs and cassettes, in the same collection as your books.
- The exact edition, found by its barcode; when a barcode covers several, you pick yours.
- What’s missing, counted for you. For every series and every author you’ve started, the app lists the volumes and books you don’t have yet.
- Your data is yours. Self-service CSV export and PDF inventory, even without a subscription.
- On a computer too. The same collection in any browser.
Scanning is free. At your first add: 7-day trial at €0, card required, then €3.95 a month or €39.95 a year, cancel anytime. Your collection stays exportable.
Frequently asked questions
- Gleeph is free. Why pay for What I Already Own?
- If you mainly want to talk books with other readers, Gleeph is a very good choice. What I Already Own is worth paying for the inventory: the exact edition, the volumes you’re missing counted for you, your records alongside your books, self-service export and a scan that answers without a signal.
- What is the difference between Gleeph and What I Already Own?
- Gleeph is a social network for books, with a library. What I Already Own is a collection inventory, for books and records, with no social network.
- Can I export my Gleeph library?
- According to the publisher’s reply to an App Store review, shelves are exported on request, by emailing Gleeph. In What I Already Own, CSV export and the PDF inventory are in the settings, even without a subscription.
- Which app lists the volumes missing from a series?
- What I Already Own: for every series you’ve started, the app counts the volumes you have and lists the others. Gleeph lets you look up your library while in a bookstore, so you can check for yourself.
- Can I use both?
- Yes: Gleeph for reviews and suggestions, What I Already Own for the inventory of your books and records.
The catalog, no account needed
The lists What I Already Own keeps up to date for you: discographies, bibliographies and reading orders.
Sources
The publishers’ official pages, with the date we checked each one. Prices and plans change: confirm them with the publisher before you subscribe.
- 1Gleeph, App Storehttps://apps.apple.com/fr/app/gleeph-gestion-biblioth%C3%A8que/id1193955842Checked on September 29, 2026.
- 2Gleeph, conditions générales d'utilisation et de ventehttps://www.gleeph.com/cguvChecked on September 29, 2026.
- 3Gleeph, Google Playhttps://play.google.com/store/apps/details?id=net.gleeph.hybridclientChecked on September 29, 2026.
This page is published by What I Already Own, one of the apps compared. We review it every three months. Spotted an error or a fact that has changed? Write to us at [email protected].