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First check whether it is a format that can be read; the list is on the Code formats page.

Then make sure there is enough light, hold the device steady and fill the viewfinder with the code without getting too close. If you are reading a code off a phone screen, turn the brightness of that screen up.

EAN-2, EAN-5, Telepen and RM4SCC can be created but not scanned back. That is down to the barcode recognition of the operating system, not to the app.

ISBN, ITF-14 and GS1-128 are read back, but the app then calls them EAN-13, ITF and Code 128, because technically that is what they are. The app warns you about this when you pick the format.

That is the check digit. An EAN-13 consists of twelve digits plus a thirteenth calculated from the other twelve. If you type it yourself, the app verifies it instead of adding one.

The same happens with EAN-8, UPC-A, UPC-E, ISBN and ITF-14. More about that on the Code formats page.

Then the entry is still too short for the chosen format. The app stays quiet about that on purpose, because carrying on typing sorts it out. Under the input field a counter does run along, for instance 9 of the 12 digits, so you can see how far you are.

There is none. What you type appears as a code straight away. Keeping it is a separate step, with the Add to history button below the code. Without that step every keystroke would leave a row in the history.

Encrypted on your own device, in the app's private folder. Nothing goes to a server. You can delete entries individually or all at once. How the encryption works is on the Security page.

No. That action also replaces the key, precisely so that nothing can be recovered. That is why it warns you first.

That is by design. The vault's key is released only after the authentication and is not kept in memory afterwards. If the app held on to it, the lock would be no more than a screen in front of the door.

Two things have to be in place: a screen lock on the device (PIN, pattern, password or fingerprint) and Android 10 or later. If either is missing, the app creates no vault. Calling something a vault while the door stands open serves no purpose.

When a fingerprint or face scan is added to the device, Android discards the vault's key. That is deliberate: otherwise someone who knows your PIN could add a finger of their own and reach your tickets.

What was in there becomes unreadable; only a backup brings it back. The app warns you about this before you start using the vault.

Because the vault sits behind your fingerprint, and the app only asks for it when you ask for the vault yourself. If the search field searched the vault as well, every search would ask for your finger. The vault has a magnifying glass of its own, and that only appears once you have opened it.

Then that file can no longer be opened, not even by the app's author. The password is not stored anywhere; there is nothing to recover or reset. That is exactly what makes the backup worth something.

The ticket vault, bulk scanning with a list to Excel, saving as SVG or PDF, a PNG at 2048 pixels, a logo from a file and reading codes from a shared PDF. Everything else is free.

It is a single one-off purchase of €4.95 in the app; Google Play shows the amount in your own currency. There is no advertising and no subscription. The full list is on the Price page.

Tap Restore purchases, below the buy button on the Pro screen. The app then asks the store again what is registered to your account. If that does not work, do send a message; there is no need to put the address of your Google account in it.

No. The purchase is tied to your Google account. Install the app with the same account and tap Restore purchases.

Yes. In Settings there is a Full screen switch. It makes Android's bars at the top and bottom disappear. Swipe from the edge and they come back for a moment; after that they go away by themselves again.

Yes, for the help in the app. At the top of the help screen are three buttons: Smaller text, Larger text and Text size back to normal. That size works separately from the setting of the device, so you can read the help larger without adjusting all your other apps.

Every screen has a question mark at the top right; it takes you to the topic about that screen. The help is in chapters, in the order in which you do things, and it can be searched.

The same explanation is on this site, on the Manual page.

No. There is no server and no account, and the app itself makes no connection. The internet permission is in the app file, put there by Google's scanning library. The whole story is in the privacy policy.

No. The camera is only used to recognise codes. No image is stored and no image leaves the device.