Short answer: Aegis is the best choice for most Android users — free, open source, encrypted vault, and it imports from everything. 2FAS is better if you want automatic cloud backup and codes on your desktop. Ente Auth wins if you need encrypted sync across Android, iPhone and desktop. Google Authenticator is fine but no longer the obvious default.
What separates them (it isn’t the codes)
Every app here generates identical six-digit codes, because they all implement the same open standard. Choosing is not about security of the algorithm — it is about what happens around it:
- Backup. The overwhelming reason people lose 2FA access is a broken or stolen phone, not a hacker. An app with no backup plan is a liability.
- Export. Can you take your tokens elsewhere later, or are you stuck?
- Encryption at rest. Is the vault protected beyond your lock screen?
- Desktop access. If you log into things on a laptop all day, reaching for your phone forty times gets tiresome.
- Trust. Open source and auditable, or at least a company whose business is not your data.
1. Aegis — best overall for Android
Free, open source (GPLv3), no ads, no account, no telemetry. Its standout feature is a properly encrypted vault: your entire token database is encrypted on disk with a password you choose, unlockable by fingerprint. Most authenticators, Google’s included, simply rely on app-private storage.
Strengths: encrypted vault, scheduled automatic exports to a folder you pick, the best import support of any app (Google Authenticator, Authy, andOTP, FreeOTP, 2FAS, Bitwarden and more), icon packs, groups, HOTP and Steam token support, codes hidden until tapped.
Weaknesses: Android only. No built-in cloud sync — you set up the export yourself, and if you never check it, you have no backup.
Pick it if: you are Android-only and want your secrets to stay off other people’s servers.
2. 2FAS — best for backups and desktop use
Also free and open source, with a friendlier default: it backs up to Google Drive automatically. That single feature solves the failure mode that actually bites people.
Its browser extension is the other draw. Pair it with your phone once, and when a site needs a code the extension sends a prompt you approve — the code fills in without you typing anything, and the secret never touches your computer.
Strengths: automatic cloud backup, browser extensions for Chrome, Firefox, Edge, Brave and Opera, runs on iPhone too, clean widgets.
Weaknesses: fewer power-user options than Aegis; the extension needs your phone reachable.
Head-to-head detail: Aegis vs 2FAS.
3. Ente Auth — best cross-platform sync
End-to-end encrypted sync across Android, iOS, desktop and web, from the team behind Ente Photos. Open source and independently audited. Your codes follow you everywhere and Ente cannot read them.
Strengths: genuine E2E sync, works offline, imports from most apps, generous free tier, excellent if you carry an Android phone and use a Mac or iPad.
Weaknesses: requires an Ente account, which is one more credential to protect.
4. Microsoft Authenticator — best if you have a work account
If your employer runs Microsoft 365, you probably have this already. It handles standard TOTP for personal accounts alongside number-matching push approvals for work ones, plus passwordless Microsoft sign-in.
Strengths: cloud backup, number matching (which blocks prompt bombing), free, enterprise-grade reliability.
Weaknesses: heavier than needed for personal use; backup tied to a Microsoft account. Comparison: Microsoft Authenticator vs Google Authenticator.
5. Bitwarden / 1Password / Proton Pass — if you already pay
Password managers with TOTP autofill both factors in one action, and the backup question disappears entirely.
The trade-off is real though: both factors then sit behind one master password. For most accounts that is still a net win, because the realistic alternative is password reuse. For your email, your bank and anything holding money, keep the codes in a separate app. Full argument: password managers with built-in TOTP.
6. Google Authenticator — works, but you can do better
It now syncs to your Google account, which fixed its worst problem. But it is closed source, has no vault password of its own, and ties your second factor to the same Google account it is often protecting.
Its genuine advantage is the export QR feature, which makes leaving easy. Use that to move somewhere better: transferring Google Authenticator and 7 alternatives worth considering.
7. Authy — check the platform first
Long the standard recommendation for multi-device sync and encrypted backups. Twilio discontinued the desktop apps, and export has always been deliberately difficult — you can get in easily and out with effort.
Still a capable mobile app. Just know what you are committing to: Authy vs Google Authenticator.
Choosing in ten seconds
- Android only, want control: Aegis.
- Want it backed up without thinking: 2FAS.
- Android plus an iPad or Mac: Ente Auth.
- Work account on Microsoft 365: Microsoft Authenticator for everything.
- Already pay for a password manager: use it, but keep your critical few separate.
One warning about the Play Store
Search “authenticator” and you will find dozens of apps with generic names, stock icons, ads and suspicious permission requests. Several have been outright credential harvesters, and a fake authenticator is uniquely dangerous — it holds every secret you scan into it.
Stick to the apps named above, check the developer, and be sceptical of anything with a five-star average from four hundred reviews and no history.
Frequently asked questions
Can I switch apps without disabling 2FA everywhere?
Often yes. Aegis and 2FAS export encrypted files, Google Authenticator exports via QR, Ente imports from most formats. Where export is impossible, you must disable and re-enable 2FA per account — a reason to weigh export support before choosing.
Are free authenticator apps safe?
The ones listed here are, and several are open source and audited. Avoid ad-supported apps with generic names and no track record.
What happens when I get a new Android phone?
Apps with cloud backup restore automatically. Aegis needs your export file. Either way, sort this out before you wipe the old device. See how to back up your authenticator app.
Should I use two apps for redundancy?
For accounts you cannot lose, yes — scan the same QR into two apps while it is on screen. Both then generate the same codes forever, independently.
Do I still need one if I use passkeys?
Yes, for now. Most banks, exchanges and smaller services still offer only codes. See phishing-resistant MFA for where each belongs.
Does the app need internet permission?
Aegis famously does not request it. Others need it for cloud backup. An offline-capable app requesting network access is not automatically suspicious — but it is worth knowing which yours is.
The bottom line
Aegis if you value control, 2FAS if you value not thinking about it, Ente Auth if you live across platforms. Any of the three beats what most people are using. Install it, migrate your tokens, and set up the backup the same day — that last part is the difference between a good app and a good outcome.
Need a code without installing anything? Our browser-based 2FA code generator runs locally on your device.