What I Already OwnSign in

Install What I Already Own on your phone

It installs straight from this site, with no store in between. Once on your home screen, it opens full screen, uses your camera to scan barcodes and works without a network.

Install the app on your phone

A real app for iPhone and Android, installed from this site in 10 seconds. No App Store, no Play Store, nothing to download.

10 seconds, no App Store.

Start installing

Then, on the page that opens:

  1. 1Tap ··· next to the address bar, then Share.
  2. 2Tap View More, then Add to Home Screen.
  3. 3Leave Open as Web App on, then tap Add.

The app then sits on your home screen as “Already Own”. It doesn't share Safari's sign-in: the first time, sign in with the code we email you, or with Face ID if you've turned it on.

Try it free

Scanning is free. At your first add: 7-day trial at €0, card required, cancel anytime. Your collection stays exportable.

Another phone or browser?

Step by step, device by device

iPhone and iPad

iPhone, Safari (iOS 26)

  1. 1Tap ··· next to the address bar, then Share.
  2. 2Tap View More, then Add to Home Screen.
  3. 3Leave Open as Web App on, then tap Add.

iPhone, Safari (iOS 16.4 to 18)

  1. 1Tap Share (the square with an arrow) at the bottom of the screen.
  2. 2Tap Add to Home Screen.
  3. 3Tap Add.

iPad, Safari

  1. 1Tap Share at the top right (on iPadOS 26: ···, then Share).
  2. 2Tap Add to Home Screen (tap View More first if it isn't shown).
  3. 3Tap Add.

iPhone, Chrome or Edge

  1. 1Tap Share in the address bar.
  2. 2Tap Add to Home Screen (tap View More first if it isn't shown).
  3. 3Tap Add.

iPhone, Firefox

  1. 1Tap the ≡ menu.
  2. 2Tap Share.
  3. 3Tap Add to Home Screen, then Add.

iPhone, inside Instagram, Facebook or Gmail

  1. 1Tap ··· at the top right.
  2. 2Tap Open in browser (or Open in Safari).
  3. 3In Safari, follow the iPhone steps.

Android

Android, Chrome or Edge

  1. 1Tap ⋮ at the top right.
  2. 2Tap Install app (or Add to Home screen).
  3. 3Confirm with Install.

Android, Firefox

  1. 1Tap ⋮.
  2. 2Tap Install (or Add to Home screen).
  3. 3Confirm with Add.

Android, Samsung Internet

  1. 1Tap Open in Chrome.
  2. 2In Chrome, tap ⋮ at the top right.
  3. 3Tap Install app, then Install.

Since March 2026, installing from Samsung Internet is blocked or flagged by Play Protect: go through Chrome, which comes with every Android phone.

Android, inside Instagram, Facebook or Gmail

  1. 1Tap Open in Chrome (or ⋮, then Open in browser).
  2. 2In Chrome, tap ⋮ at the top right.
  3. 3Tap Install app, then Install.

Computer

From a computer

  1. 1Open your phone's camera.
  2. 2Point it at the code and tap the link that appears.
  3. 3Follow the steps shown on your phone.

On a computer, the app also works in the browser, to search, sort and browse your collection. In Chrome or Edge, the install icon in the address bar adds it to your computer; in Safari on a Mac, choose File, then Add to Dock. Scanning barcodes needs a phone camera.

Questions

Why isn't the app on the App Store?
It installs straight from this site, with no store in between: nothing to download, and you always open the latest version. Once on your home screen, it opens full screen like any other app.
Do I need to sign in again after installing?
On iPhone, yes, once: the installed app doesn't share Safari's sign-in. Sign in with the code we email you, or with Face ID if you've turned it on. On Android, you stay signed in.
Does it work without a network?
Yes. Once your collection has loaded on your phone, you can browse it offline, and barcodes scanned offline are queued, then recognised when the network comes back.
How do I uninstall it?
Like any other app: press and hold the icon, then remove it. Your collection stays saved in your account.
How much does it cost?
A 7-day free trial, then €3.95 a month or €39.95 a year, VAT included, for everything: records and books, on your phone and your computer. Your card is requested when the trial starts; cancel before it ends and you pay nothing. What you've catalogued stays yours, exportable at any time.