🔒 Microsoft Authenticator vs Authy 2026: Head-to-Head Comparison

In July 2024, Twilio disclosed that an unauthenticated API endpoint exposed phone numbers for approximately 33 million Authy users — a breach that landed in headlines precisely because authenticator apps are supposed to be the safe choice. If you're weighing Microsoft Authenticator vs Authy in 2026, the security track record is one of several factors worth examining alongside the features.

Quick Verdict Table

Microsoft Authenticator: What It Does Well

Microsoft Authenticator is a free app from Microsoft, available on iOS and Android. It functions in two distinct modes depending on the account type:

• For Microsoft accounts (personal, work, and school): push notification approval with number matching, passwordless phone sign-in, and deep integration with Microsoft Entra ID (formerly Azure Active Directory) and Microsoft 365.
• For third-party accounts (Google, GitHub, Amazon, etc.): standard six-digit TOTP code generation, compatible with any service using the standard TOTP protocol.

The standout feature for Microsoft users is number matching, enabled by default for all Microsoft Authenticator MFA notifications since May 2023. When a sign-in triggers a push request, the app displays a two-digit number that you must match to the number shown on the login screen. This directly addresses MFA fatigue attacks — where attackers send repeated push notifications hoping a user approves one out of frustration or accident. Without number matching, accepting a push requires a single tap; with it, you must verify a displayed number, which an attacker cannot know.

Cloud backup uses your Microsoft account on Android or iCloud on iOS. Restoring to a new phone requires signing into the same account; both paths work reliably when the backup was set up in advance.

Where it falls short: Microsoft Authenticator is strictly single-device. Your TOTP codes cannot be active on both a phone and a tablet simultaneously. And outside the Microsoft ecosystem, it adds no advantage over a generic TOTP app — the push notification and passwordless features are Microsoft-account-exclusive.

Authy: What It Does Well

Authy, built by Twilio, was one of the first authenticator apps to offer cloud-backed TOTP storage. Its core differentiator remains multi-device sync: register Authy on up to five devices and your codes are available on all of them simultaneously. Phone and tablet, phone and work laptop, two phones — all stay in sync.

Cloud backup uses AES-256 encryption with a separate backup password that only you set. Twilio does not hold this password. Lose your phone, install Authy on a replacement, verify your registered phone number, enter your backup password, and all codes restore instantly. The recovery flow is genuinely fast and requires no coordination with individual services.

In March 2024, Twilio discontinued the Authy desktop apps for Windows, macOS, and Linux. Authy is now mobile-only.

The July 2024 breach deserves a clear-eyed assessment. Attackers exploited an unauthenticated API endpoint to verify which phone numbers were registered with Authy, exposing approximately 33 million numbers. TOTP secrets and backup passwords were not accessed — the cryptographic codes stored in the app were not compromised. Twilio patched the endpoint immediately and pushed rate-limiting updates to the app. A phone number leak is a meaningful privacy incident; a TOTP secret leak would be an authentication catastrophe. The two are not equivalent.

One underused configuration: once you've added all the devices you want, you can disable multi-device within Authy's settings. This prevents any new device from being registered, removing the attack surface that multi-device sync creates while preserving your existing devices.

Head-to-Head: Feature by Feature

Cloud Backup and Recovery

Authy's backup model is more resilient for most individuals. Codes are encrypted with a password you control and stored on Authy's servers, independent of any third-party account. Recovery requires your phone number and backup password — nothing else.

Microsoft Authenticator's backup relies on iCloud on iOS or a Microsoft account on Android. Both recovery paths work, but each adds a dependency: iCloud account access and iCloud Keychain must be enabled on iOS; a signed-in Microsoft account must be present on Android. These are common prerequisites, but they introduce more that can go wrong on a new device.

Critical note for Authy users: if you lose both your phone and your backup password, no recovery is possible. Write the backup password down on paper and store it somewhere physically secure. This is not optional.

Multi-Device Support

Authy allows up to five devices to have active access to your TOTP codes simultaneously. Microsoft Authenticator does not support this; each account can only be active on a single device at a time. For users who want codes accessible from both a phone and a secondary device, Authy is the only practical choice between these two apps.

Device Migration

Switching phones is where Authy's cloud model produces the starkest difference. On a new device: install Authy, verify your phone number, enter your backup password — typically under five minutes for a full restore regardless of how many accounts you have.

With Microsoft Authenticator, migration requires either a functioning old device to initiate an account transfer, or a pre-existing cloud backup. If neither is available, every account must be reconfigured individually, which means locating recovery codes or temporary access methods for each service. For users with many 2FA-protected accounts, this is a significant practical burden.

Security Architecture

NIST SP 800-63B designates app-based TOTP as a higher assurance level than SMS OTP. The reasoning: SMS codes can be intercepted via SIM swap or SS7 vulnerabilities; TOTP codes are generated on-device and never transmitted. Both Microsoft Authenticator and Authy operate well above the SMS baseline on this measure.

The NCSC recommends app-based authenticators over SMS for both personal and organisational accounts, noting that TOTP apps are appropriate for the majority of consumer authentication scenarios. Neither the NCSC nor NIST specifies a preference between compliant TOTP apps.

Microsoft Authenticator's number matching adds a layer that Authy lacks: resistance to MFA fatigue specifically on Microsoft account push requests. For users whose threat model includes targeted MFA fatigue attacks — more relevant in corporate environments — this matters. For TOTP code generation on third-party services, both apps are functionally equivalent.

Platform and Ecosystem Fit

Organisations running Microsoft Entra ID, Microsoft 365, or Azure benefit from Microsoft Authenticator's native integration with Conditional Access policies, Intune device management, and the broader Microsoft identity platform. IT administrators can configure and enforce authenticator policies centrally. Authy has no equivalent enterprise management capability.

For personal use with no Microsoft infrastructure dependency, the two apps are functionally equivalent for standard TOTP. The multi-device and recovery advantage tips the practical balance toward Authy for most individual users.

When to Choose Each

Choose Microsoft Authenticator if you…

• Use Microsoft 365, Entra ID, Azure AD, or a personal Microsoft account as a primary identity
• Want push notification approval with number matching for Microsoft accounts
• Want passwordless phone sign-in for personal Microsoft accounts
• Are in an organisation managing devices via Microsoft Intune
• Have a single primary phone and don't need multi-device code access

Choose Authy if you…

• Want your TOTP codes accessible on multiple devices simultaneously
• Switch phones regularly and want a one-step cloud restore
• Don't depend on Microsoft's identity platform and want a standalone solution
• Prefer controlling your own backup encryption password rather than relying on iCloud or a Microsoft account
• Have previously used or plan to use a desktop authenticator (note: desktop support ended in 2024)

Frequently Asked Questions

Is Microsoft Authenticator safer than Authy?

Both are considered secure for TOTP-based 2FA. Microsoft Authenticator has had no significant data incidents. Authy's parent Twilio suffered an API breach in July 2024 that exposed approximately 33 million phone numbers, though TOTP secrets were not compromised. Microsoft Authenticator's number matching also provides additional defence against MFA fatigue attacks on Microsoft accounts specifically.

What happens to my Authy codes if I lose my phone?

Authy stores AES-256 encrypted backups on its servers, protected by your backup password. Install Authy on a replacement device, verify your registered phone number, and enter your backup password to restore all codes. Without the backup password, there is no recovery path — set one as soon as you set up the app.

Can Microsoft Authenticator store non-Microsoft accounts?

Yes. Microsoft Authenticator generates standard TOTP codes for any service using the standard TOTP protocol — Google, GitHub, Amazon, Dropbox, and hundreds of others. Push notifications and passwordless sign-in are Microsoft-account features; all other accounts use standard six-digit codes.

Did Authy get hacked?

In July 2024, Twilio disclosed that an unauthenticated API endpoint allowed attackers to verify which phone numbers were registered with Authy, exposing approximately 33 million numbers. TOTP secrets and backup passwords were not accessed. Twilio secured the endpoint and pushed rate-limiting updates to the Authy app.

Can I run both Authy and Microsoft Authenticator simultaneously?

Yes — many users do. A common setup keeps Microsoft Authenticator for Microsoft and work accounts and Authy for personal accounts elsewhere. Both apps operate independently; there are no conflicts. During initial account setup, scan each service's QR code into whichever app you want to use for that account.

Bottom Line

The Microsoft Authenticator vs Authy decision comes down to ecosystem and workflow. Inside the Microsoft stack — Entra ID, Microsoft 365, Azure — Microsoft Authenticator is the clear choice: number matching, passwordless sign-in, and Intune integration are features Authy simply doesn't offer. Outside the Microsoft ecosystem, Authy's multi-device sync and reliable one-step cloud restore give it a practical edge for most individual users.

Either app is a major upgrade over SMS-based 2FA. NIST SP 800-63B classifies SMS OTPs at a lower assurance level than app-based authenticators because SMS is interceptable; a TOTP code generated on-device never travels over a channel an attacker can tap. Whichever app you choose, you're making the right move by switching away from SMS.

For more on authenticator options, see our three-way authenticator app comparison and our full 2026 authenticator app roundup.

Sources: Twilio Security Advisory (July 2024), NIST SP 800-63B Digital Identity Guidelines (2025 revision), NCSC Two-Factor Authentication Guidance, Microsoft Entra ID documentation, Microsoft Authenticator release notes. Published 20 August 2026.