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.
Cloud Backup vs Local-Only Storage: The Real Tradeoff
The biggest decision when choosing an authenticator app is where your secret keys live. Cloud-syncing apps (Authy, Google Authenticator, Microsoft Authenticator) copy your tokens to an account you can restore after switching phones. That convenience has a cost: your 2FA secrets are only as safe as that cloud account, so a compromised Google, Microsoft, or Authy account is a compromised set of 2FA keys — and attackers know this, which is one reason these accounts are heavily targeted.
Local-only apps (Aegis, Raivo) keep secrets on your device and give you an encrypted backup file you control. No vendor can be breached to expose your keys, but you accept the responsibility: lose the device and the backup, and you are locked out of every account. The practical middle ground is a local-only app with two copies of the encrypted backup — one at home and one somewhere off-site.
Whatever you choose, save the setup keys or recovery codes each service gave you. An authenticator app is a tool, not a guarantee — your offline backup is what actually protects you from lockouts.
Open Source Apps: Why Code Transparency Matters
Open source authenticator apps like Aegis (Android) and Raivo OTP (iOS) publish their source code, which means security researchers can audit how secrets are stored and encrypted. Closed-source apps may be perfectly secure too, but you're asked to take their claims on trust. For an app that holds the keys to your email, bank, and crypto accounts, the ability to verify the code is a meaningful advantage.
A separate benefit is portability: open source apps generally use standard file formats and TOTP secrets, so you can always migrate to another app in the future. That's not guaranteed with every proprietary app. If community auditability matters to you, an open source app with a manual encrypted backup is the strongest combination available.
Frequently Asked Questions
Can I store 2FA codes in a password manager?
Yes, several password managers include TOTP code generation. The tradeoff: your passwords and 2FA secrets live in one tool, so gaining access to the manager unlocks everything. Protect the master password with strong 2FA and keep it for accounts that matter most.
Which apps store codes only on my device?
Open source apps like Aegis and Raivo OTP keep secrets locally and use encryption with manual backup files. They are the standard choice for users who don't want their 2FA keys in any cloud account.
Do authenticator apps need internet to restore a backup?
Codes always generate offline, but cloud-synced apps need a connection to fetch a backup on a new device. Local-only apps restore from a backup file with no internet at all.
Can malware steal codes from my authenticator app?
If your phone is compromised, an attacker with device access can potentially read stored secrets. Enable the app lock or biometric protection your authenticator offers and keep your phone's operating system updated.
Password Managers With Built-In TOTP: 1Password and Bitwarden
If you already use a password manager, its built-in authenticator may be the best option you have. 1Password and Bitwarden both generate TOTP codes next to the saved login, which means one app handles both the password and the second factor — no switching between apps, and 1Password can even auto-fill the code with the password. Bitwarden offers the same convenience on every platform, and its free tier includes unlimited TOTP entries, which makes it one of the cheapest ways to consolidate 2FA.
The trade-off is concentration of risk: your passwords and your 2FA secrets now live in one place, so the master password becomes a single point of failure. If someone obtains your master password and an unlocked device, they can reach everything. That is why 1Password's Watchtower and Bitwarden's security reports are worth using, and why you should enable 2FA on the password manager itself — a hardware key is ideal there. A reasonable pattern is keeping TOTP in the password manager for lower-value accounts and using a dedicated authenticator app or hardware key for email, banking, and crypto.
Feature Checklist: What to Look For in an Authenticator App
Whatever app you pick, these features separate a tool you can trust for years from one you will outgrow in months:
- Encrypted backup with a way out: cloud sync (Authy, Microsoft) or exportable encrypted files (Aegis, Raivo). No backup path at all means a lost phone is a locked account.
- App lock: PIN, password, or biometric protection so a stolen, unlocked phone does not expose every code.
- Unlimited entries: most apps are fine here, but check the limit before you commit hundreds of accounts.
- Import and export: standard formats (otpauth links) mean you can switch apps later without re-scanning everything.
- No internet required to generate codes: TOTP is offline by design; if an app refuses to show codes without a connection, treat that as a red flag.
- Account naming and organization: folders or search so you can find the right code quickly when you have forty entries.
Mistakes People Make When Setting Up a New Authenticator App
Most lockouts caused by authenticator apps come from setup errors, not from the apps failing. The most common: adding an account, confirming it works, and then never saving the secret or backup codes before deleting the setup email or the QR screenshot. The second most common is keeping the default account name the service generated — "user@example.com (2)" — until you have twenty cryptic entries and cannot tell which code belongs to which service during a hurried login.
Another frequent mistake is testing only once. After adding an account, sign out of the service and sign back in with the new app before you retire the old one. And if you switch phones, remember that some apps tie cloud backup to a phone number (Authy) or an account (Google, Microsoft) — update those details before you wipe the old device, or the backup follows the old number and your codes do not.
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