Start Here: Your iPhone Already Has One
The best kept secret in iPhone security is that iOS has a built in TOTP authenticator hiding inside the Passwords app (on older iOS versions, it lives under Settings then Passwords). Open a saved login, tap "Set Up Verification Code," scan the QR or paste the setup key, and codes generate automatically, and even autofill directly in Safari. It syncs through iCloud Keychain, end to end encrypted, to every Apple device signed into your account.
For an Apple-only household, that combination of autofill convenience and zero extra apps installed is genuinely hard to beat. So why does the rest of this ranked list exist at all? Three real reasons: cross-platform needs (a Windows PC at work, an Android tablet somewhere in the house), a deliberate preference for keeping your two factors out of the same ecosystem entirely, and power features like encrypted local exports that Apple's built in tool does not offer.
The Ranked List
1. 2FAS (Best Free Standalone App)
Free, open source, no account required to use it, and genuinely polished. It offers iCloud or fully local encrypted backups, an Apple Watch companion app, a browser extension approval flow where your phone approves a login with one tap, and no ads or upsell prompts anywhere in the interface. For anyone whose request is simply "give me a great authenticator app and nothing else," this is the current best answer on iPhone.
2. Ente Auth (Best Cross-Platform Sync)
Open source with genuine end to end encrypted sync across iOS, Android, and desktop apps, which makes it the strongest answer to "I want my codes available on every platform I own, without trusting a big tech company's cloud to hold them." Setup takes a few extra minutes compared to 2FAS because it involves creating an Ente account, but that account is what makes the cross-device sync work without any plaintext ever touching a server. Full breakdown in our Ente Auth review.
3. Apple Passwords (Best for Apple-Only Users)
Described in detail above: unbeatable autofill integration, invisible sync, and it is already installed on every iPhone running a recent iOS version. Its limits are that it is Apple ecosystem only, and codes living beside passwords in the same iCloud Keychain concentrates both factors into one place. That is a perfectly reasonable trade if your Apple ID itself is hardened to a high standard, meaning a hardware key or passkey protecting the Apple ID login, not just a password. See the trade-off logic in more depth in our piece on combined factors.
4. Google Authenticator (Best If Your Life Runs Through Google)
Clean, universal, and it now syncs entries through your signed-in Google account rather than trapping codes on one device. Its export QR feature also keeps you genuinely free to leave for another app later, which was not always true of older versions. On iPhone it is a solid citizen, and the considerations are essentially identical to using it on Android; see our cloud backup analysis for the detail on what that account sync actually protects and what it does not.
5. Microsoft Authenticator (Best for Microsoft Accounts)
If your daily life includes Microsoft 365, Outlook, or a work account tied to Microsoft Entra, the passwordless push approvals with number matching justify installing this one on their own; it also holds standard TOTP entries for every other site, so it does not need to be a second app alongside a "real" authenticator. Comparison details live in our Microsoft vs Google piece.
Honourable Mention: Your Password Manager
Bitwarden and 1Password both generate TOTP codes right beside your saved logins, with flawless autofill for both factors in one motion. That is one app for everything, with the concentration trade-off discussed at length in the dedicated roundup on that exact topic.
Not Applicable Here: Aegis
Aegis is frequently recommended as one of the two best open source authenticators, alongside 2FAS, but it is Android only with no iOS build and no plans announced for one. If you split your devices between an iPhone and an Android tablet or a work phone, Aegis simply is not on the table for the iPhone side of that setup; 2FAS or Ente Auth are the open source options that actually work here. Our Aegis vs 2FAS comparison covers that pairing in full for anyone on Android.
Ranking honesty: every app on this list implements the exact same open standard, producing identical codes from identical secrets, provable with our own browser generator for any account. You are choosing a backup story and an interface here, not stronger or weaker cryptography.
The Feature That Should Actually Decide It: Backup
| App | Backup model | Lost iPhone recovery |
|---|---|---|
| Apple Passwords | iCloud Keychain, end to end encrypted | Sign into any Apple device with your Apple ID |
| 2FAS | iCloud or local encrypted file | Restore the backup file on a new phone |
| Ente Auth | End to end encrypted account sync | Sign in anywhere with your Ente account |
| Google Authenticator | Google account sync | Sign into the app with the same Google account on a new phone |
| Microsoft Authenticator | iCloud backup on iOS | Restore the backup on a new iPhone |
Whichever one you choose, enable its backup mechanism today, not after the phone is already lost or broken, and keep per-account backup codes as the layer beneath that (see our storage guide). For the day nothing works at all, the recovery drill is our lost phone playbook.
Frequently Asked Questions
Can I use Face ID to protect these apps?
Yes: every app on this list supports biometric lock, and Apple Passwords requires it by its very nature as part of the OS. Enable it everywhere; a phone thief should not get a free pass to your codes just because the phone itself was unlocked at the time. How biometrics actually work under the hood is covered in our biometric explainer.
How do I move my codes from Google Authenticator into a new app?
Google Authenticator's built in export QR, found under the menu then Transfer Accounts, can be imported directly by several apps on this list, or failing that you can re-enroll per account from scratch. The general process either way is covered in our transfer guide.
Is the built in Apple option really as secure as a dedicated third party app?
The underlying TOTP implementation is standard, and iCloud Keychain's encryption is genuinely excellent, independently reviewed, and end to end. The real design consideration is concentration risk: passwords and codes sitting in one synced store rather than two separate ones. Harden the Apple ID itself (a strong unique password, trusted devices reviewed periodically, recovery contacts configured) and it becomes a thoroughly defensible setup for the vast majority of people.
Do any of these work on Apple Watch?
2FAS and Authy both have dedicated watch apps, and glancing at a code on your wrist mid-login without touching the phone at all is nicer in practice than it sounds on paper. Apple Passwords instead autofills directly on whichever device you are actually logging in on, which covers the same convenience through a different mechanism.
What about Authy on iPhone?
Still functional and still genuinely multi-device, with the caveats detailed in our Authy vs Google Authenticator piece: accounts tied to a phone number rather than an email, and historically no clean export path if you decide to leave. The apps ranked above match its core strengths with fewer of those strings attached.
Which one should someone with zero technical patience actually install today?
If every device you own is an Apple device, do nothing extra and just turn on the built in option inside Passwords; it is already there and needs no download. If a Windows PC or Android device is anywhere in the picture, 2FAS is the least fussy standalone app on this list and the safest default recommendation for a non-technical relative.
