Why Your Choice of Authenticator App Matters
All TOTP authenticator apps generate codes using the same underlying RFC 6238 standard — so why does the choice of app matter? Because the differences lie in backup and recovery, multi-device support, usability, and how well the app protects your secrets if your phone is lost or compromised.
This comparison covers the most widely used options, focusing on their genuine strengths and trade-offs — without sponsored rankings.
The Apps at a Glance
| App | Cloud Backup | Multi-Device | Open Source | Platforms |
|---|---|---|---|---|
| Google Authenticator | Yes (Google account) | Yes (sync) | No | iOS, Android |
| Authy | Yes (encrypted) | Yes | No | iOS, Android, Desktop |
| Microsoft Authenticator | Yes (MS/iCloud) | Limited | No | iOS, Android |
| Aegis (Android) | Manual export | Manual | Yes | Android only |
| Raivo OTP (iOS) | iCloud | No | Yes | iOS only |
| 2FAS | iCloud / Google Drive | Limited | Yes | iOS, Android |
Detailed Breakdown
Google Authenticator
Best for: Users already in the Google ecosystem who want simplicity.
Google Authenticator is the most widely recognized TOTP app, and it has improved significantly with the addition of Google account sync. Accounts are now backed up and transferable to new devices — solving its biggest historical weakness. It's clean, fast, and works with virtually every 2FA-enabled service.
Trade-off: All your secrets sync through Google's servers. If your Google account is compromised, so is your authenticator backup. Also closed source.
Authy
Best for: Users who want desktop access and multi-device sync out of the box.
Authy has long offered cloud-encrypted backup and multi-device support, which made it a popular choice before Google Authenticator added sync. It runs on iOS, Android, and has desktop apps. Backup encryption is password-protected on Authy's servers.
Trade-off: Twilio (Authy's parent company) has announced sunsetting its desktop apps. Its closed-source nature means you're trusting the company's security claims. Account recovery requires a phone number, which introduces a SIM-swap risk.
Microsoft Authenticator
Best for: Microsoft 365 / Azure AD users; supports passwordless sign-in for Microsoft accounts.
Microsoft Authenticator goes beyond TOTP — it supports push notifications and passwordless login for Microsoft accounts, making it a powerful option in enterprise Microsoft environments. It backs up to Microsoft's cloud (or iCloud on iOS).
Trade-off: Designed primarily for Microsoft's ecosystem. Migration to non-Microsoft platforms can be cumbersome.
Aegis (Android)
Best for: Security-conscious Android users who want full control over their data.
Aegis is open-source, free, and highly regarded in the security community. It stores secrets in an encrypted local vault that you can export and back up wherever you choose. It supports TOTP, HOTP, and Steam Guard formats, and offers a clean interface with fingerprint lock.
Trade-off: Android only. Backup is manual — you must remember to export and secure your vault file regularly.
Raivo OTP (iOS)
Best for: iOS users who want an open-source app with iCloud backup.
Raivo is a well-designed, open-source TOTP app for Apple devices. It syncs via iCloud and supports Apple Watch. The interface is polished and the codebase is publicly auditable.
Trade-off: iOS and macOS only. No Android version.
2FAS
Best for: Users who want open source with optional cloud backup and a browser extension.
2FAS offers open-source mobile apps and a browser extension that can send approval requests to your phone — combining TOTP convenience with a push-notification workflow. Backup can go to Google Drive or iCloud.
Trade-off: Less well-known, though gaining a strong reputation in privacy-focused communities.
Which Should You Choose?
- Prioritize ease and ecosystem fit: Google Authenticator (Google users) or Microsoft Authenticator (Microsoft users)
- Prioritize open-source and control: Aegis (Android) or Raivo (iOS)
- Need multi-device and desktop: Authy (with awareness of its trade-offs) or 2FAS
What to Avoid
Avoid any authenticator app that stores your TOTP secrets in plaintext, lacks a PIN/biometric lock, or is made by an unknown developer with no security track record. Also be wary of apps that request unnecessary permissions — a TOTP app has no business needing access to your contacts or camera beyond the initial QR scan.
The Most Important Step
Regardless of which app you choose, back up your secrets. Whether through cloud sync or a securely stored export file, losing access to your authenticator app can lock you out of every account where you've enabled 2FA. Set up your backup strategy before you need it.