Authenticator Apps for 2FA
A guide to the best authenticator apps for two-factor authentication, with setup instructions and tips for keeping your account secure.
Last updated: March 22, 2026
What is two-factor authentication?
Two-factor authentication (2FA) adds a second layer of security to your login. After entering your password, you'll also need to provide a temporary 6-digit code generated by an authenticator app on your phone.
Even if someone discovers your password, they still can't access your account without the code from your authenticator app. It's one of the most effective ways to protect your account.
How authenticator apps work
Authenticator apps generate a new 6-digit code every 30 seconds using a shared secret key (the QR code you scan during setup). These codes are generated offline on your device — no internet connection or SMS required. This makes them more secure and reliable than text message codes.
Recommended authenticator apps
Here are the most popular authenticator apps, listed from most popular to least. All of them work with LeyApp. Pick the one that fits your needs best.
Top 5 authenticator apps
- Google Authenticator — Free, simple, and widely supported. Available for iOS and Android. Now supports cloud backup to your Google account. Download: https://apps.apple.com/app/google-authenticator/id388497605 (iOS) · https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2 (Android)
- Microsoft Authenticator — Free with cloud backup, push notifications, and password autofill. Great if you also use Microsoft services. Download: https://apps.apple.com/app/microsoft-authenticator/id983156458 (iOS) · https://play.google.com/store/apps/details?id=com.azure.authenticator (Android)
- Authy by Twilio — Free with multi-device sync and encrypted cloud backups. Your codes are available across all your devices. Download: https://apps.apple.com/app/twilio-authy/id494168017 (iOS) · https://play.google.com/store/apps/details?id=com.authy.authy (Android)
- 1Password — Premium password manager with built-in authenticator. Keeps your passwords and 2FA codes in one place. Download: https://apps.apple.com/app/1password-password-manager/id1511601750 (iOS) · https://play.google.com/store/apps/details?id=com.onepassword.android (Android)
- LastPass Authenticator — Free authenticator with push notifications and cloud backup. Works well with or without a LastPass account. Download: https://apps.apple.com/app/lastpass-authenticator/id1079110004 (iOS) · https://play.google.com/store/apps/details?id=com.lastpass.authenticator (Android)
We recommend choosing an app that supports cloud backup (like Authy, Microsoft Authenticator, or Google Authenticator) so your codes aren't lost if you lose or replace your phone.
How to set up 2FA on LeyApp
- Go to Settings, expand Security, and select Two-Factor Authentication
- Click 'Set up authenticator app'
- Download one of the authenticator apps listed above if you don't have one
- Open your authenticator app and scan the QR code shown on screen (or enter the secret key manually)
- Enter the 6-digit code from your authenticator app to verify and activate 2FA
What if I lose my device?
When you first enable 2FA, LeyApp generates a set of recovery codes. These are one-time-use codes that let you log in even without your authenticator app. Save them in a secure location — a password manager, a printed copy in a safe place, or a secure note.
If you've used all your recovery codes, or didn't save them, contact LeyApp support for help regaining access to your account.
Always save your recovery codes when you set up 2FA. Without them, losing access to your authenticator app could lock you out of your account.