All TOTP authenticator apps generate codes using the same standard algorithm — the difference is in features, backup options, and ease of use. Here's how the top options compare.
In This Guide
Google Authenticator
Best for: Simplicity and Google account integration
- Generates TOTP codes for any service
- Supports encrypted Google account backup (added in 2023)
- Simple, no-frills interface
- Limited features — no password protection, no multiple devices natively
Verdict: A reliable baseline. Good if you want something simple and don't switch phones often.
Authy
Best for: Cross-device sync and cloud backup
- Encrypted cloud backup — don't lose codes when you change phones
- Works across multiple devices simultaneously
- App lock with PIN or biometrics
- Requires phone number registration (privacy consideration)
Verdict: The best balance of security and convenience for most users.
Microsoft Authenticator
Best for: Microsoft 365 and enterprise users
- Deep integration with Microsoft accounts — push notifications for passwordless sign-in
- Cloud backup to Microsoft account
- Supports TOTP for all standard services
- Slightly heavy for non-Microsoft users
Verdict: Excellent if you use Microsoft 365, Teams, or Azure. Overkill for personal use only.
Aegis Authenticator (Android only)
Best for: Privacy-conscious Android users
- Completely offline — no cloud sync, no accounts required
- Encrypted local backup with export options
- Open source and fully auditable
- Android only
Verdict: The top choice for security-focused Android users who manage their own backups.
Raivo OTP (iOS only)
Best for: Privacy-conscious iPhone users
- Open source iOS TOTP app
- iCloud backup (encrypted)
- Clean, minimalist interface
- iOS only
Verdict: Best open-source option for iPhone. Good alternative to Google Authenticator on iOS.
Which Authenticator App Should You Use?
Use Authy if you want reliable cloud backup and multi-device access — ideal for most users.
Use Aegis (Android) or Raivo (iOS) if privacy and open-source are priorities.
Use Google Authenticator if you just want something simple and already use Google.
Or use 2faco.com — generate TOTP codes directly in your browser with zero installation.
Backup and Recovery: What Happens If You Lose Your Phone?
The biggest practical concern with authenticator apps is what happens when you lose your device. Each app handles this differently, and getting it wrong means being locked out of every account that uses 2FA.
Authy stores an encrypted backup of your tokens in the cloud. Install Authy on a new phone, verify your phone number, and all your codes are restored immediately.
Google Authenticator syncs to your Google Account since its 2023 update. Sign in on a new device and your tokens restore automatically.
Microsoft Authenticator backs up to your Microsoft account. Recovery requires signing in with your Microsoft credentials on a new device.
Aegis (Android) requires you to create and store a manual encrypted backup file. This is more secure but requires discipline — if you do not have a recent backup, you lose your tokens.
Raivo (iOS) backs up to iCloud. Recovery is as simple as restoring your iCloud backup.
Before choosing an app, decide your priority: convenience (Authy, Google Authenticator) or control and privacy (Aegis, Raivo).
How to Switch Authenticator Apps Without Losing Access
Switching authenticator apps requires care. The safe process: install the new app, then for each service re-scan the QR code in the new app before removing it from the old one. Never delete your old app until every account is confirmed working in the new one.
SMS vs Authenticator App: Which Is More Secure?
Why TOTP apps beat SMS 2FA.
Google Authenticator vs Authy: Full Comparison
Deep dive comparison of the two most popular apps.
What Is TOTP? How Time-Based Codes Work
The algorithm behind all authenticator apps.