BAYAuth vs. 2FAS: open-source authenticators compared
BAYAuth is a zero-knowledge, browser-based TOTP authenticator that syncs 2FA codes across every device — no app install required. 2FAS is an open-source mobile authenticator that stores your tokens locally with optional cloud backup and a browser extension for code filling. Both are free and open source, but they make fundamentally different architectural choices: local-first mobile app versus browser-native vault. Here is how those choices play out in practice.
Two philosophies
Mobile-first local vault vs. browser-native sync
2FAS and BAYAuth are both open source, but they start from different assumptions about where your vault lives and how you access it.
2FAS: local-first with optional backup
2FAS stores your TOTP secrets on your phone, encrypted with a master password. Cloud backup goes through Google Drive or iCloud — your own storage, not 2FAS's servers. This is a strong privacy model for a phone-only workflow, but it means your vault is primarily a local asset. If you need codes on a laptop, you need the phone nearby.
BAYAuth: browser-native with zero-knowledge sync
BAYAuth encrypts your vault in the browser before upload, using AES-256-GCM and a key derived from your master password. The server stores ciphertext it cannot read. The result: real-time sync across every device with a browser — phone, laptop, desktop, Chromebook — without installing anything. The trade-off is that sync goes through BAYAuth's servers rather than your own cloud storage.
The sync model defines the experience
2FAS's backup-and-restore model means your vault is not live on a second device — you restore it when you set up a new phone. BAYAuth's sync model means your vault is available immediately on any device you sign in to. For users who switch between phone and desktop multiple times a day, real-time sync is a different product category than periodic backup.
Desktop access is the key gap
2FAS has a browser extension that can fill TOTP codes, but the vault lives on your phone. You need the phone app running and nearby to approve code fills. BAYAuth runs entirely in the browser — no phone needed, no extension relay. Your vault is there as soon as you sign in on any PC, Mac, or Linux machine. For desk workers, developers, and anyone who spends significant time at a keyboard, this is the most practical difference between the two tools.
Side by side
BAYAuth vs. 2FAS, feature by feature
Both are open source and both encrypt your secrets. The differences are in how they handle sync, desktop access, backup, and the encryption trust model.
| Feature | BAYAuth | 2FAS |
|---|---|---|
| Open source | ||
| Cloud sync | Real-time, zero-knowledge | Backup only (Google Drive / iCloud) |
| Desktop access | Full vault in any browser | Phone must be nearby (browser extension) |
| Backup / recovery | Recovery key + master password | Cloud backup file + password |
| Encryption | AES-256-GCM zero-knowledge | AES encryption (local + cloud backup) |
| Browser extension | Full vault access | Code fill only (phone required) |
Trade-offs
Where each architecture wins
Open-source transparency
Both BAYAuth and 2FAS are open source, which means you can verify the encryption implementation rather than trusting a marketing claim. 2FAS has a strong community and is transparent about its local storage model. BAYAuth is transparent about its zero-knowledge sync model — the server code, the encryption constants, and the key derivation parameters are all published. The shared advantage is auditability; the difference is what you are auditing.
Backup and recovery
2FAS backs up your encrypted vault to your own Google Drive or iCloud. If you lose your phone, you restore from that backup on a new device. This is a simple, transparent model — the backup is yours, in your cloud storage. BAYAuth provides a recovery key (a human-readable code you store offline) plus your master password for signing in from any device. Recovery does not depend on your cloud storage being accessible, and the encrypted vault is always available on BAYAuth's servers as ciphertext. Both models work; the choice depends on whether you prefer managing your own backup files or having a vault that is always accessible through sign-in.
Desktop and laptop workflows
2FAS's browser extension is useful for filling codes, but it requires the phone app to be running and nearby. If your phone is dead, charging in another room, or you left it at home, you cannot fill codes on your laptop. BAYAuth runs entirely in the browser — the vault is loaded when you sign in, and codes generate locally from the shared secret. No phone needed, no relay, no dependency on a second device being powered on and in Bluetooth range. For anyone who codes, administers servers, or manages accounts from a desktop for extended periods, this is the most tangible quality-of-life difference.
Encryption trust model
Both tools encrypt your vault, but the trust model is different. 2FAS encrypts locally and stores the result on your device or in your own cloud — you control the storage layer entirely. BAYAuth encrypts in the browser with AES-256-GCM, then syncs the encrypted vault to its servers. The server never receives the decryption key, so it stores ciphertext it cannot read. The trust difference: with 2FAS, you trust your own cloud provider (Google, Apple) to store encrypted files. With BAYAuth, you trust the published encryption implementation to be correct. Both are reasonable trust models for different users.
Both tools encrypt your secrets — the architecture matters
2FAS encrypts your vault locally and backs it up to your own cloud storage. BAYAuth encrypts in the browser with AES-256-GCM and syncs encrypted vault data to its servers, with a key the server never receives. Both are open source and both are reasonable choices. The difference is in whether you prefer a local-first model with your own backup management, or a browser-native model with real-time sync. BAYAuth's full architecture, including its stated limitations, is documented openly rather than asserted.
FAQ
What people ask about BAYAuth vs. 2FAS
Is 2FAS better than BAYAuth?
It depends on what you need. 2FAS is a well-built, open-source mobile authenticator with optional cloud backup and a browser extension for filling codes. If your workflow is phone-first and you are comfortable with the mobile app model, 2FAS is a solid choice. BAYAuth is better if you need full desktop access without a phone, want a vault that syncs across every device including laptops and desktops, or prefer a zero-knowledge architecture where the server never holds decryption keys. Both are open source and both are free — the trade-off is platform model, not quality.
Does 2FAS sync across devices?
2FAS offers optional cloud backup through Google Drive or iCloud, which lets you restore your vault on a new phone. This is not real-time sync — it is a periodic backup that you restore on a new device. BAYAuth syncs in real time: sign in on any device and your vault is there immediately, encrypted with your master password. For users who switch between phone and desktop frequently, the browser-based model is more practical than a backup-and-restore cycle.
Can I use 2FAS on PC?
2FAS has a browser extension that can fill TOTP codes on a PC, but the vault itself lives on your phone. You need the phone app running to approve code fills, which means your phone must be nearby and powered on whenever you need a code on your desktop. BAYAuth runs natively in the browser on any PC, Mac, or Linux machine — no phone required. Your vault is there as soon as you sign in.
How does BAYAuth's encryption compare to 2FAS?
2FAS encrypts your vault with a master password and stores it locally, with optional cloud backup through your own cloud storage. BAYAuth uses AES-256-GCM encryption in the browser, with a key derived from your master password through a KDF, and syncs the encrypted vault to its own servers. Both protect your secrets at rest. The difference is in sync and access: 2FAS's model is local-first with optional backup, while BAYAuth's model is cloud-synced with zero-knowledge encryption. BAYAuth's server never receives the decryption key, so even it cannot read your vault.
Get your codes on every device — phone included
BAYAuth gives you a zero-knowledge vault with real-time sync across every device. No phone required, no app install, no extension relay. Free and open source.
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