BAYAuth vs. Authy: a direct comparison
BAYAuth is a zero-knowledge, browser-based TOTP authenticator that syncs 2FA codes across every device — no app install required. Authy, owned by Twilio, was long the go-to for cross-device 2FA, but with its desktop app removed and development slowing, users are looking for alternatives that offer the same sync with stronger privacy guarantees. Here is how the two actually compare on the dimensions that matter.
What happened
Authy's desktop retreat and what it means
For years, Authy was the best way to sync 2FA codes across phone and desktop. Twilio's recent moves changed that calculus.
Desktop app removed
Twilio discontinued Authy's macOS and Windows desktop applications. Users who relied on a desktop authenticator for coding, server administration, or password-manager workflows suddenly had no desktop path. The remaining mobile app works, but the cross-device story is now incomplete.
Recovery tied to phone number
Authy's account recovery depends on your phone number and SMS verification. If you lose your phone, change your number without migrating first, or hit Twilio's rate limits on verification codes, recovery becomes a support process rather than an instant one. BAYAuth's recovery key model gives you a self-service path that does not depend on a third party.
Encryption boundary is different
Authy encrypts your tokens, but the encryption is managed by Twilio's infrastructure — a third party holds the encrypted blobs and the account model that gates access. BAYAuth seals your vault with AES-256-GCM in the browser before upload, under a key your master password derives. The server stores ciphertext it cannot read. For users who care about who holds the keys, the distinction is fundamental.
Browser-native beats platform-dependent
BAYAuth runs in Chrome, Firefox, Edge, and Safari. There is no OS-specific build to wait for, no app store approval cycle, and no risk of a vendor discontinuing a platform. The same vault, the same codes, on a Windows work laptop, a MacBook, a Linux desktop, and a Chromebook — without installing anything.
Side by side
BAYAuth vs. Authy, feature by feature
Both products sync 2FA codes across devices and are free. The differences are in how they handle desktop access, recovery, encryption, and the trust model.
| Feature | BAYAuth | Authy |
|---|---|---|
| Sync across devices | ||
| Desktop support | Any browser | Mobile only (desktop app removed) |
| Recovery method | Recovery key + master password | Phone number + SMS verification |
| Encryption model | AES-256-GCM zero-knowledge | Encrypted cloud (Twilio-managed) |
| Open source | ||
| Pricing | Free | Free |
Trade-offs
Where each tool wins and loses
Sync across devices
Both BAYAuth and Authy sync your 2FA tokens across multiple devices, which is the core feature people switched to Authy for in the first place. The difference is in scope: Authy syncs between Authy apps on phones and, until recently, desktop clients. BAYAuth syncs across any device with a browser — that includes desktop operating systems where Authy no longer ships an app. For teams that span Windows offices and Mac-heavy design shops, a browser-based vault is the more reliable sync surface.
Desktop support
This is where the gap is sharpest. Authy removed its desktop application, leaving users to either switch to the mobile-only app or find a workaround. BAYAuth has always been browser-native, so desktop access is not a feature it ships — it is a fundamental property of the architecture. Open a browser on any desktop OS and your vault is there. There is no platform risk from a vendor deciding a desktop build is not worth maintaining.
Recovery and lockout prevention
Authy ties account recovery to your phone number. If you lose your phone and cannot verify via SMS, or if Twilio's recovery process changes, you may be locked out of your vault. BAYAuth provides a recovery key — a human-readable code you can store offline — plus your master password for signing in from any device. Recovery is self-service, does not depend on a third party, and works regardless of what happens to your phone number.
Open source and auditability
BAYAuth's codebase is open source, which means anyone can verify how encryption is implemented, how keys are derived, and whether the server ever sees plaintext. Authy is proprietary. For security-conscious users, the ability to audit the tool you trust with your 2FA secrets is a meaningful differentiator — not because open source is automatically more secure, but because it makes verification possible.
Every zero-knowledge claim needs verification
“Zero-knowledge” is a claim about architecture, not a guarantee by itself. BAYAuth seals your vault with AES-256-GCM in the browser, under a key derived from your master password, before anything is uploaded — the server stores ciphertext it cannot read. The full architecture, including its stated limitations, is documented openly rather than asserted.
FAQ
What people ask about BAYAuth vs. Authy
Is Authy shutting down?
Twilio removed Authy's desktop application and has been consolidating features toward a mobile-only experience. While the mobile app still works as of 2026, the trajectory — desktop app removed, reduced active development, community concern about long-term support — means relying on Authy alone carries increasing platform risk. BAYAuth, by contrast, runs in any browser on any operating system with no app to lose.
How does BAYAuth compare to Authy's cloud sync?
Authy syncs your 2FA tokens across devices through Twilio's cloud, encrypted with a key tied to your Authy account. BAYAuth uses a different model: your vault is encrypted client-side with AES-256-GCM before it ever reaches the server, using a key derived from your master password through a KDF — the server stores ciphertext it cannot decrypt. The practical result is similar cross-device access, but BAYAuth's zero-knowledge design means no third party can read your secrets even with a subpoena, while Authy's encryption depends on Twilio's infrastructure and account security.
Can I import from Authy?
Authy does not provide a direct export format that other tools can read. The standard approach is to export your tokens from the services themselves (most services let you re-enroll a new authenticator), then add them to BAYAuth by scanning the new QR codes. BAYAuth also reads Google Authenticator's QR-code export, so if you have tokens in both apps, the Google Authenticator route is often faster for bulk migration.
Is BAYAuth more private than Authy?
BAYAuth is designed around a zero-knowledge model: your secrets are encrypted on your device with a key derived from your master password, and the server never receives the decryption key. Authy, owned by Twilio, stores encrypted tokens that Twilio's infrastructure can manage — a different trust boundary. For users who want to minimize the number of entities that can access their 2FA secrets, BAYAuth's architecture is architecturally stricter, though both are reasonable choices depending on your threat model.
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