If it's offline, how does it stay in sync with the service?

Both sides use the same secret and the same clock, so they arrive at the same number independently. Nothing has to be exchanged.

Does Authenticator App work offline?

Generating codes is pure maths on your device: your stored secret plus the current time. That's why the app keeps working on a plane, in a dead spot, or with mobile data off.

What works offline

Generating 6-digit codes for every account you've added.
Adding an account from a QR code or a setup key.
Opening the app with Face ID, Touch ID, or your PIN.

What needs a connection

Backing up to or restoring from iCloud.
Syncing changes to your other Apple devices.
The built-in VPN, private browser, and password-leak checks.

FAQ

If it's offline, how does it stay in sync with the service?: Both sides use the same secret and the same clock, so they arrive at the same number independently. Nothing has to be exchanged.

Keep your 2FA codes in one secure place

Authenticator App - Novaz generates your codes offline, backs them up encrypted to your own iCloud, and locks behind Face ID — free and ad-free.

Download on the App Store

Related guides

Set up 2FA on your accounts

Step-by-step guides for the services people secure first.

Browse all setup guides or check whether a service supports 2FA.