Two-factor authentication apps all do the same basic job — generate a rotating six-digit code so a stolen password alone isn't enough to break into your accounts — but Aegis Authenticator and Authy take almost opposite approaches to where those codes actually live.
The short version: Aegis is free, open-source, and Android-only, keeping your 2FA codes in an encrypted vault entirely on your device with no forced cloud account. Authy is the mainstream, cross-platform choice, with automatic cloud backup and sync across multiple devices — convenient, but it means trusting a company with your encrypted vault instead of keeping it fully local.
Aegis Authenticator — your codes never leave your phone
Aegis stores 2FA codes in an encrypted vault unlocked by biometrics or a PIN, with no ads, no company account, and no forced cloud sync — it's free, open-source, and community-maintained. It can import codes straight from Google Authenticator, Authy, FreeOTP+ and others, so switching in is easy. The tradeoff is real: it's Android-only with no official iOS version, there's no automatic cloud backup by design, and losing your phone without a recent manual backup means losing every code. It also assumes a bit more comfort with the app than mainstream options aimed at less technical users. Best for: Android users who'd rather manage their own backups than trust a cloud account with their 2FA vault.
Authy — cloud backup and multi-device sync, out of the box
Authy was built as a drop-in replacement for Google Authenticator, and its main advantage is exactly what Aegis deliberately skips: automatic backups and the ability to use the same codes across multiple devices without manually re-registering each one. It's free for up to 100 successful authentications, with pricing beyond that unclear on the public site. The convenience comes from Authy holding your encrypted vault in the cloud, which means your account security now depends partly on Authy's own infrastructure and account-recovery process, not just your device. Best for: anyone who wants 2FA that survives a lost phone without manual backup discipline, and who's comfortable trusting a cloud-synced vault.
At a glance
| Aegis Authenticator | Authy | |
|---|---|---|
| Platform | Android only | Multi-device (phone, desktop) |
| Cloud sync | None by design | Automatic |
| Price | Free, open-source | Free up to 100 authentications |
| Backup | Manual, user-controlled | Automatic cloud backup |
| Best for | On-device privacy, no cloud trust | Convenience across devices |
Pick Aegis if you'd rather keep your 2FA codes fully on your device and are willing to manage your own backups in exchange for not trusting a third party with your vault. Pick Authy if you want codes that survive a lost or replaced phone automatically, and multi-device sync matters more to you than keeping everything strictly local. There's no wrong answer here — it's a genuine tradeoff between convenience and where your secrets physically live.