Duo Mobile

If your service provides a key instead of a QR code, look for a tiny '+' button on the main screen—it's easy to miss. Tap that to access the manual entry field where you can paste or type the key. Avoid tapping the QR scanner icon repeatedly, as that won't lead to manual entry.

Yes, you can swipe left or right on the push notification to approve or deny a login request directly from your lock screen or notification shade. This is especially handy when you're busy, like walking the dog or juggling keys, and don't want to open the app.

The persistent notification is required for the app to receive push notifications in the background, so disabling it may break the instant approval feature. Unfortunately, there's no built-in way to hide it without affecting functionality, but it's a common trade-off for fast push alerts.

Duo Mobile works offline using time-based one-time passwords (TOTP), so codes should generate even without signal. If they stop, ensure your phone's date and time are set to automatic, as incorrect time can break TOTP. If the issue persists, try removing and re-adding the account.

Duo Mobile offers faster push notifications (under 2 seconds) and the ability to approve or deny logins without opening the app, while Google Authenticator relies solely on TOTP codes. However, Duo Mobile lacks a biometric lock or password manager integration, which Google Authenticator also doesn't have, but Duo's privacy permissions (like phone access) may feel more invasive to some users.