This guide compares authenticator apps using current official documentation for platforms, backup, export, and account requirements. It does not present a fresh hands-on benchmark. That distinction matters: a feature documented by a developer is evidence that the feature exists, but it is not proof that the workflow is fast, pleasant, or bug-free on every device.
Correction published August 30, 2026: The previous edition contained outdated platform information for Proton Authenticator, Authy, Google Authenticator, and FreeOTP+. It also described source-based research as hands-on testing and used generated interface images in screenshot positions. This edition removes those claims and images, changes the ranking, and links the deciding facts to primary sources.
The short answer is simple. Pick Aegis for an Android-only encrypted local vault, Ente Auth for open-source cross-platform sync, Proton Authenticator for flexible account-optional use across mobile and desktop, 2FAS for a phone-centered workflow with a browser companion, or Google Authenticator for a basic option tied to a Google Account. Authy is no longer a top recommendation because its desktop apps reached end of life in 2024.
How this comparison was checked
Four decision points determine the ranking: where the token secrets are stored, what happens after a lost phone, whether the data can be exported, and which platforms are actually supported. Open-source availability is included because it permits inspection, but it is not treated as proof that an app has no vulnerabilities.
The evidence pass used product documentation and project repositories available on August 30, 2026. Marketing claims were narrowed when the documentation did not support a stronger statement. No malware resistance, breach probability, speed, or usability score is assigned without a reproducible test record.
| Pick | Best fit | Platforms documented | Recovery model | Main limitation |
|---|---|---|---|---|
| Aegis | Android users wanting local control | Android | Encrypted exports and local automatic backups | No iOS or desktop app |
| Ente Auth | Cross-platform encrypted sync | Android, iOS, web, Windows, macOS, Linux | End-to-end encrypted sync and encrypted export | Sync uses an Ente account |
| Proton Authenticator | Flexible mobile and desktop use | Android, iOS, Windows, macOS, Linux | Optional Proton sync, iCloud sync on Apple devices, or local-only use | Newer product with a shorter operating history |
| 2FAS | Phone-centered use with browser assistance | Android, iOS, supported browsers | Platform backup plus migration tools | Browser companion still depends on the phone app |
| Google Authenticator | Simple Google Account users | Android and iOS | Google Account synchronization or device transfer | Closed source and fewer portability controls than the leading picks |
1. Aegis Authenticator: best for Android local control
Aegis is free, open source, and Android-only. Its project documentation describes an AES-256-GCM encrypted vault, password or biometric unlock, TOTP and HOTP support, encrypted exports, and automatic backups to a location chosen by the user. Read the Aegis project documentation and backup FAQ.
The useful distinction is that Aegis does not provide its own cloud account. A backup can be written to Android storage and moved elsewhere by a compatible storage or synchronization app. This gives the user control, but also gives the user responsibility. An encrypted export that is never copied off the phone is not a recovery plan.
Aegis documents import support for several other apps, but some import paths require root access. Do not delete the old authenticator until every critical account produces a valid code in Aegis and fresh recovery codes have been stored separately.
Choose Aegis when: the device is Android, local custody matters more than automatic multi-platform sync, and manual backup verification is acceptable.
2. Ente Auth: best for open-source cross-platform sync
Ente Auth documents mobile, desktop, and web clients with end-to-end encrypted synchronization. Its official Auth page also describes bulk import and data export. The encrypted export format uses Argon2id for key derivation and XChaCha20-Poly1305 for encryption, according to the export specification.
This is a stronger portability story than a product that offers synchronization without a documented export path. It also reduces the chance that a single lost phone becomes an account-recovery emergency. The trade-off is that synchronized use depends on an Ente account and on the availability and security of that service, even though token data is designed to remain end-to-end encrypted.
Choose Ente Auth when: codes are needed across mobile and desktop, open-source clients and an export path are priorities, and an encrypted account-based sync model is acceptable.
3. Proton Authenticator: best account-optional cross-platform choice
Proton launched Proton Authenticator on July 31, 2025, not in late 2024. The app is free on iOS, Android, Windows, macOS, and Linux. A Proton account is optional: codes can remain local, Apple devices can use iCloud synchronization, and a Proton account enables end-to-end encrypted sync across supported platforms. These details come from the launch announcement and current support page.
The previous version of this guide incorrectly described the app as paid, subscriber-only, and iOS-only. Those errors materially changed who could use the product and are the main reason Proton moved into the top five after this review.
Choose Proton Authenticator when: mobile and desktop support is needed, local-only use should remain possible, or a Proton account is already part of the recovery plan.
4. 2FAS Authenticator: best phone-centered browser workflow
2FAS is an open-source mobile authenticator with a browser extension that assists desktop sign-ins. The important architecture point is that the extension works with the phone app; it is not a standalone desktop vault. Review the product description and browser extension documentation before choosing it for a desktop-heavy workflow.
That phone-centered design can be a benefit because the token source stays separated from the browser session. It can also be inconvenient if the phone is unavailable. Backup behavior differs between Android and iOS, so the backup and restore path should be tested on the actual platform before relying on it.
Choose 2FAS when: the phone will remain the primary authenticator and browser assistance is more valuable than a full desktop authenticator app.
5. Google Authenticator: best for a simple Google Account workflow
Google Authenticator supports Google Account synchronization on both iOS and Android. Google announced the capability for both platforms in April 2023. The earlier Top5soft edition incorrectly said cloud backup was Android-only. See the Google security announcement.
Users can also transfer codes between devices. Google Authenticator remains a reasonable basic choice, but it is closed source and offers less control over encrypted export formats than Aegis or Ente Auth. Account synchronization also changes the threat model: protecting the Google Account and its recovery methods becomes part of protecting the authenticator data.
Choose Google Authenticator when: a simple mobile workflow matters most and the user is comfortable making a Google Account part of recovery.
Why Authy is no longer a top-five pick
Twilio ended support for the Authy desktop apps on March 19, 2024. The previous edition still listed Windows, macOS, and browser-extension support, which was wrong. Twilio’s end-of-life notice directs users toward the mobile apps.
Authy can still generate codes on supported mobile devices and its encrypted backup may be useful to existing users. The problem is portability: moving away from Authy can require account-by-account re-enrollment, especially when a direct export path is unavailable. Anyone planning a migration should keep the old app active, sign in to each service, replace the authenticator registration, verify the new code, and save new recovery codes before removing Authy.
The correct question is not whether Authy suddenly stopped working. It is whether starting a new authenticator setup today should depend on a mobile-only, proprietary system with a difficult exit path. For this ranking, the answer is no.
Backup and migration checklist
A good authenticator without a tested recovery path can still cause a lockout. Use this sequence when changing apps:
- Start with email, the password manager, Apple or Google account, banking, domain registrar, and developer accounts.
- Save fresh recovery codes for each service in a separate encrypted location.
- Add or migrate the token to the new authenticator without deleting the old entry.
- Sign out and complete a real login with the new code.
- Create an encrypted export or confirm that synchronized recovery works on a second device.
- Record the backup location and review date, but do not put live TOTP secrets in an unencrypted inventory.
- Remove the old authenticator registration only after every critical account has passed the check.
TOTP codes are not phishing-resistant. A fake login page can relay a current code to the real service. Passkeys or FIDO2 security keys are stronger for accounts that support them. NIST treats PSTN out-of-band authentication as restricted, and CISA recommends stronger MFA where available. Consult the NIST authenticator guidance for the technical model.
The best choice is therefore not a universal winner. It is the app whose platform support, export path, and recovery model match the devices and risks involved.
