Best Duo Security App

225+ iOS apps curated and reviewed

4.4 avg rating
20 free apps
Updated July 2026

Duo Mobile is the household name in duo security app, but it's far from the only option. We track 225+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Duo Security App (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Duo MobileDuo MobileFree4.9★ (2.2M)NoNoAug 2026
2Microsoft AuthenticatorMicrosoft AuthenticatorFree4.7★ (677K)NoNoAug 2026
3Google AuthenticatorGoogle AuthenticatorFree4.9★ (1.1M)NoNoAug 2026
4Authenticator ℠ AppAuthenticator ℠ AppFree4.3★ (4.4K)YesYesAug 2026
52FA Authenticator • Auth App+2FA Authenticator • Auth App+Free4.5★ (95)YesYesJul 2026
6Authenticator: Secure 2FA, MFAAuthenticator: Secure 2FA, MFAFree4.6★ (61)NoYesJul 2026
7Two Factor Authenticator & OTPTwo Factor Authenticator & OTPFree4.5★ (133)NoYesJul 2026
8Authenticator: Secure 2FA AuthAuthenticator: Secure 2FA AuthFree3.7★ (3)YesYesJul 2026

Top Picks for Duo Security App

Duo Mobile#1

Duo Mobile by Duo Security LLC

Security made simple
Editor's Choice
💼 Business
4.9😐(2.2M ratings)
Free
#12in Business
Duo Mobile screenshot 1
Duo Mobile screenshot 2
Duo Mobile screenshot 3
Duo Mobile screenshot 4

Enhance login security with two-factor authentication. Generate passcodes or use one-tap push notifications for seamless access to your accounts. Manage authentication for multiple applications and web services.

What We Love

  • 👍 Simple and easy to use
  • 🔒 Provides an extra layer of security
  • 🚀 Quick and convenient authentication
  • 🔒 Secure login experience

Room to Improve

  • 🐛 Unreliable notifications and push functionality
  • 🐛 Compatibility issues when changing devices
  • 🐛 Slow and frustrating authentication process
Microsoft Authenticator#2

Microsoft Authenticator by Microsoft Corporation

Protects your online identity
Strong Contender
📊 Productivity
4.7😞(677K ratings)
Free
#5in Productivity
Microsoft Authenticator screenshot 1
Microsoft Authenticator screenshot 2
Microsoft Authenticator screenshot 3
Microsoft Authenticator screenshot 4
Microsoft Authenticator screenshot 5
Microsoft Authenticator screenshot 6

Securely sign into online accounts with multi-factor authentication, passwordless login, or password autofill. Manage multiple accounts, including non-Microsoft services, and access Microsoft products and services seamlessly.

What We Love

  • 🚀 Seamless authentication
  • 🔒 Secure login process
  • 👍 Convenient passwordless sign-in
  • 🚀 Smooth app performance

Room to Improve

  • 🐛 Broken Apple Watch functionality
  • 🐛 Backup and restore issues
  • 🐛 Confusing login flow
Google Authenticator#3

Google Authenticator by Google

Worth Considering
🔧 Utilities
4.9😞(1.1M ratings)
Free
#3in Utilities
Google Authenticator screenshot 1
Google Authenticator screenshot 2
Google Authenticator screenshot 3
Google Authenticator screenshot 4
Google Authenticator screenshot 5
Google Authenticator screenshot 6

Enhance your online security with a second verification step for your accounts. Generate codes directly on your phone, even offline, to protect against unauthorized access. Sync codes across devices for easy access and manage multiple accounts securely.

What We Love

  • 👍 User-friendly
  • 🔒 Secure authentication
  • 🚀 Simple and fast
  • 🔒 Reliable security

Room to Improve

  • 🐛 Randomly deleted all codes
  • 🐛 Unreliable, lost access to accounts
  • 🐛 Timing issues, codes didn't work

More Duo Security App apps to explore

4
Authenticator ℠ App
Authenticator ℠ App
Authenticator ℠ App
Authentication App: 2FA, MFA
Free

Secure your online accounts with standards-based two-factor authentication. This app generates time-based one-time passwords directly on your device, offering a reliable second step for sign-ins without relying on SMS codes. Protect personal and work accounts across various platforms.

Secure TOTP verification codesFast and easy account setupFull control over 2FA accounts
🔧 Utilities
(4.4K)
free with in-app purchases
5
2FA Authenticator • Auth App+
2FA Authenticator • Auth App+
2FA Authenticator • Auth App+
Secure & Fast Authentication
Free

Enhance your online account security with this tool that generates two-factor authentication (2FA) codes. It supports a wide range of services and offers effortless setup with a user-friendly interface. Secure your digital identity and gain peace of mind.

Generate two-factor authentication codesSupport for a wide range of servicesEffortless setup process
📊 Productivity
(95)
free with in-app purchases
6
Authenticator: Secure 2FA, MFA
Authenticator: Secure 2FA, MFA
Authenticator: Secure 2FA, MFA
2 Step Verification Auth: TOTP
Free

This app provides two-factor authentication to secure your online accounts. It generates time-based one-time passwords for various services, offering features like cloud backup, biometric protection, and offline code generation. Protect your digital life with this reliable and user-friendly security solution.

Time-based one-time passwords (TOTP)Secure cloud backup and syncBiometric and PIN protection
🔧 Utilities
(61)
free with in-app purchases
7
Two Factor Authenticator & OTP
Two Factor Authenticator & OTP
Two Factor Authenticator & OTP
Simple 2FA authentication app
Free

Enhance your online security with robust two-factor and multi-factor authentication. This app generates secure one-time passwords and supports multiple protocols, with features like backup, restore, and encrypted data storage for peace of mind.

Two-Factor Authentication (2FA)Multi-Factor Authentication (MFA)TOTP and HOTP Support
🔧 Utilities
(133)
subscription
8
Authenticator: Secure 2FA Auth
Authenticator: Secure 2FA Auth
Authenticator: Secure 2FA Auth
2 Factor Authentication: MFA
Free

Securely manage your two-factor authentication tokens and passwords in one place. This app offers offline code generation and a private in-app browser. Free users can manage existing codes and passwords, while premium subscribers gain unlimited creation and secure browsing.

Organize 2FA tokens and passwordsOffline code generationBuilt-in secure browser
🔧 Utilities
(3)
free with in-app purchases
9
Authenticator ·
Authenticator ·
Authenticator ·
2FA, Two Factor Authentication
Free

Securely store and generate two-factor authentication (2FA) tokens for your online accounts. Protect your accounts from hackers with an additional layer of security. Features encrypted backups, cross-device synchronization, and a private browser.

Secure 2FA token generationEncrypted iCloud backupsCross-device synchronization
🔧 Utilities
(26K)
free with in-app purchases
10
Twilio Authy
Twilio Authy
Twilio Authy
by Authy Inc.
Free

This app provides a secure and convenient way to manage two-factor authentication tokens for your online accounts. It offers features like cloud backups, multi-device synchronization, and offline token generation to enhance account security and prevent lockouts.

Secure 2-step verification token generationEncrypted cloud backupsMulti-device synchronization
🔧 Utilities
(53K)
free
11
Authenticator ® App
Authenticator ® App
Authenticator ® App
2FA Two Factor Authentication
Free

This app enhances online security by managing two-factor authentication codes for over 1,000 applications. It offers features like password leak detection, VPN protection, and secure password autofill, with cloud backups and biometric security options.

Two-factor authentication code generationPassword leak detectionVPN protection
📊 Productivity
(3.2K)
free with in-app purchases
12
UniFi Verify
UniFi Verify
UniFi Verify
Secure Your Identity
Free

Enhance account security with two-factor authentication. This app generates time-sensitive codes and single-use passwords for logins, providing an extra layer of protection against unauthorized access. It supports multiple accounts across various platforms.

Two-factor authentication (2FA)Time-sensitive verification codesSingle-use passwords
💼 Business
(11K)
free
13
m-Post
m-Post
m-Post
by Alpha System SAS
Free

This app provides a mobile solution for security workforce management, enabling real-time reporting, guard tours, and shift tracking. It integrates with a web-based platform for customization and data processing, enhancing operational efficiency and communication.

Guard tour managementPost order accessShift start/end tracking
💼 Business
(29)
free
14
Authenticator App - DuoShield
Authenticator App - DuoShield
Authenticator App - DuoShield
2FA Verify Password: TOTP, 2FA
Free

Secure your online accounts with this comprehensive two-factor authentication tool. It offers features like account organization, customizable icons, secure backups, and Face ID protection. Unlock advanced features like QR code scanning and manual 2FA entry with premium subscriptions.

Account creation and storageCustomizable account foldersPersonalized account icons
🔧 Utilities
(15)
free with in-app purchases
15
BoifunCam
BoifunCam
BoifunCam
by Mingify Innovations Technology Co., Limited
Free

Monitor your home security with live video streaming and motion detection. Receive instant alerts when movement is detected, allowing you to take immediate safety measures. Access your cameras from your phone to review footage anytime, anywhere.

Live video streamingMotion detection recordingInstant push notifications
🌟 Lifestyle
(314)
free
16
FaceTime
FaceTime
FaceTime
by Apple Inc.
Free

Connect with loved ones through high-quality audio and video calls. Share experiences like watching videos or listening to music together, collaborate on projects, and enhance your calls with fun effects and improved audio quality. Easily invite anyone to join, regardless of their device.

Video and audio messagingSharePlay for synced mediaScreen sharing with remote control
🌐 Social Networking
(24K)
free
17
AccountAbility Mobile
AccountAbility Mobile
AccountAbility Mobile
by AccountAbility Global LLC
Free

This security guard management system app facilitates guard tours, patrol tracking, and reporting for AccountAbility Global customers. It offers features like a Community Watch App, customizable functions, and real-time reporting with client branding. The app provides 24/7 U.S.-based expert support and geofencing for enhanced security.

Guard tour trackingPatrol monitoringSecurity officer reporting
📊 Productivity
(52)
free
18
Guardio - Mobile Security
Guardio - Mobile Security
Guardio - Mobile Security
Browsing & Identity Protection
Free

This app offers comprehensive digital protection for your devices, identity, and online accounts. It detects and alerts you to threats like phishing, leaked passwords, and identity theft, providing guidance to enhance your online safety.

Real-time personal info exposure alertsPhishing and scam detectionIdentity monitoring
🔧 Utilities
(37K)
free with in-app purchases
19
Authenticator App Plus
Authenticator App Plus
Authenticator App Plus
2FA Security, OTP Verification
Free

Secure your online accounts with this app, offering robust two-factor authentication (2FA) and time-based one-time password (TOTP) generation. It provides advanced security features like end-to-end encryption, privacy mode, and break-in alerts, alongside convenient multi-device sync and quick QR code scanning for effortless account protection across all your Apple devices.

Time-based one-time password (TOTP) generationEnd-to-end encryption for codesPrivacy Mode to hide codes
📊 Productivity
(171)
freemium
20
LastPass Password Manager
LastPass Password Manager
LastPass Password Manager
Store & Autofill Passwords
Free

Securely store, generate, and autofill passwords and other sensitive information with a single master password. Syncs across all devices and offers advanced security features.

Secure password vaultAutofill loginsPassword generator
📊 Productivity
(57K)
freemium

FAQ about Duo Security App

What is the best duo security app for iPhone?
Duo Mobile tops our duo security app ranking as of July 2026, with a 4.9-star average from 2.2M App Store ratings, and it's free to download.
Yes — 20 of the top duo security app we rank are free to download, including Duo Mobile and Microsoft Authenticator.
Duo Mobile has no ads and has no in-app purchases, according to its App Store listing as of July 2026.
We track 225+ duo security app on the iOS App Store as of July 2026, ranked by rating, recency, and analysis of real user reviews.
Duo Mobile enhances login security by providing two-factor authentication. It generates passcodes and allows for one-tap authentication via push notifications to secure your accounts.
The application works with Duo Security's service to offer secure logins. You can generate passcodes directly within the app or approve login requests with a simple tap on a push notification.