Best Duo 2 Factor Apps

234+ iOS apps curated and reviewed

4.5 avg rating
20 free apps
Updated June 2026

Duo Mobile is the household name in duo 2 factor, but it's far from the only option. We track 234+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Top Picks for Duo 2 Factor

Duo Mobile#1

Duo Mobile by Duo Security LLC

Security made simple
Editor's Choice
💼 Business
4.9😐(2.2M ratings)
Free
#13in 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
2FA Authenticator (2FAS)#2

2FA Authenticator (2FAS) by Two Factor Authentication Service, Inc.

#1 Rated 2FA Authenticator
Strong Contender
📊 Productivity
4.7😊(34K ratings)
Free
2FA Authenticator (2FAS) screenshot 1
2FA Authenticator (2FAS) screenshot 2
2FA Authenticator (2FAS) screenshot 3
2FA Authenticator (2FAS) screenshot 4
2FA Authenticator (2FAS) screenshot 5
2FA Authenticator (2FAS) screenshot 6

Securely log in to your online accounts with two-factor authentication. This app protects your personal data and passwords from cyber threats with a simple, private, and open-source solution. It offers easy token restoration, app protection, and offline functionality.

What We Love

  • 🚀 Efficient and fast
  • 🔒 Secure and private
  • 👍 Simple and intuitive UI
  • 💡 Customizable icons and folders

Room to Improve

  • 🐛 Occasional bugs and crashes
  • 🔒 Lack of password/PIN protection
  • 🕰 No Apple Watch app
2FA Authenticator • Auth App+#3

2FA Authenticator • Auth App+ by APPSTER LIMITED

Secure & Fast Authentication
Worth Considering
📊 Productivity
4.5(95 ratings)
FreeAdsIn-App Purchases
2FA Authenticator • Auth App+ screenshot 1
2FA Authenticator • Auth App+ screenshot 2
2FA Authenticator • Auth App+ screenshot 3
2FA Authenticator • Auth App+ screenshot 4
2FA Authenticator • Auth App+ screenshot 5
2FA Authenticator • Auth App+ screenshot 6

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.

More Duo 2 Factor apps to explore

4
Authenticator App ™
Authenticator App ™
Authenticator App ™
Two Factor Authentication
Free

This app provides a secure way to manage two-factor authentication (2FA) for your online accounts. It generates time-based one-time passwords (TOTP) that update every 30 seconds, offering an extra layer of security without needing an internet connection. Features include iCloud backup, cross-device synchronization, and biometric unlock.

Time-based one-time password (TOTP) generationSecure iCloud backup and encryptionSynchronization across all devices
🔧 Utilities
(21K)
free with in-app purchases
5
Authenticator ℠ App
Authenticator ℠ App
Authenticator ℠ App
2FA, Two Factor Authentication
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
(4K)
free with in-app purchases
6
Authenticator: AuthSnap
Authenticator: AuthSnap
Authenticator: AuthSnap
Fast. Safe. Verified.
Free

This app simplifies online security by generating one-time passcodes for two-factor authentication. It supports both time-based and counter-based algorithms and offers easy setup via QR code scanning.

QR code scanning for setupTOTP and HOTP supportUser-friendly interface
🔧 Utilities
(11)
freemium
7
Google Authenticator
Google Authenticator
Google Authenticator
by Google LLC
Free

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.

Offline code generationSync codes across devicesAutomatic QR code setup
🔧 Utilities
(1.1M)
free
8
Authenticator Duo: Two Factor
Authenticator Duo: Two Factor
Authenticator Duo: Two Factor
2Fa Authy, MFA Authentication
Free

Secure your online accounts with this app that generates and stores two-factor authentication codes. It offers end-to-end encryption, Face ID/Touch ID access, and encrypted iCloud backups for easy restoration across devices. Operate securely offline and import existing tokens.

Generate and store 2FA/MFA tokensScan QR codes or manually input codesEnd-to-end encryption for all codes
🔧 Utilities
(14)
subscription
9
2FAuthify - Authenticator app
2FAuthify - Authenticator app
2FAuthify - Authenticator app
Two Factor Authenticator
Free

Secure your online accounts with a robust two-factor authentication app. Generate, store, and manage 2FA and MFA codes for numerous services, ensuring your digital life remains protected. Offers encrypted backups, cross-device sync, and offline code generation.

Strong encryption and privacyEncrypted cloud backupCross-device synchronization
📊 Productivity
(30)
free with in-app purchases
10
Microsoft Authenticator
Microsoft Authenticator
Microsoft Authenticator
Protects your online identity
Free

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.

Multi-factor authentication (MFA)Passwordless sign-inPassword autofill
📊 Productivity
(663K)
free
11
Guide for Google Duo
Guide for Google Duo
Guide for Google Duo
by Davit Mkrtchtan
Free

Learn how to use a popular video calling app with this comprehensive guide. It offers step-by-step tutorials with images to help you install, set up, and master video calls. Discover how to connect with your phone contacts easily.

Installation guideSetup instructionsMaking video calls
📚 Books
(29)
free
12
Internet Protection App 2FA+
Internet Protection App 2FA+
Internet Protection App 2FA+
MFA & OTP Keypass Manager
Free

Enhance your online security with this app, providing two-factor authentication (2FA) and multi-factor authentication (MFA) tokens. It generates secure, time-based one-time passwords (TOTP) that update every 30 seconds, working offline for seamless verification across thousands of websites and services.

Two-factor authentication (2FA)Multi-factor authentication (MFA)Time-based one-time passwords (TOTP)
🔧 Utilities
(61)
free with in-app purchases
13
Authenticator App+
Authenticator App+
Authenticator App+
2FA Two Factor Authentication
Free

Secure your online accounts with this app. It generates and stores two-factor authentication codes for popular services. Features include QR code scanning, end-to-end encryption, and device syncing.

Generate and store 2FA/MFA codesScan QR codes or enter manuallyEnd-to-end encryption
📊 Productivity
(12K)
subscription
14
SkyDuo - Video Calling & Chat
SkyDuo - Video Calling & Chat
SkyDuo - Video Calling & Chat
Calls, Texts, 2nd Phone Number
Free

Connect with friends and family globally through free video calls and messaging. This app also provides secondary phone numbers for private calling and texting, offering a secure and cost-effective communication solution.

Free video calls across devicesPrivate second phone numbersCheap international calls and texts
🌐 Social Networking
(2K)
free with in-app purchases
15
Google Meet
Google Meet
Google Meet
Video calling and meetings
Free

Connect with friends, family, and colleagues through high-quality video calls and meetings. Schedule calls, send video messages, or join spontaneous conversations. Enhance interactions with features like real-time captions, in-call chat, and engaging effects.

High-quality video callsScheduled meetingsVideo messages
🌐 Social Networking
(2.3M)
freemium
16
Authenticator App - Two Factor
Authenticator App - Two Factor
Authenticator App - Two Factor
Two-factor - Duo Security
Free

Secure your online accounts with this simple and safe two-factor authentication app. It generates 6-digit one-time passwords to add an extra layer of security against hackers. Protect your accounts by scanning QR codes or manually entering tokens.

Secures online accountsGenerates 6-digit TOTP codesSupports QR code scanning
🔧 Utilities
(400)
free with in-app purchases
17
Authenticator App
Authenticator App
Authenticator App
2FA Authentication MFA & OTP
Free

This app provides secure two-factor authentication codes for your online accounts, enhancing security with encryption and backups. It offers seamless synchronization across Apple devices and quick access via widgets, even when offline.

Secure & Private EncryptionEncrypted BackupAutomatic Synchronization
📊 Productivity
(46K)
subscription
18
Two Factor Authenticator App
Two Factor Authenticator App
Two Factor Authenticator App
Simple 2FA Authentication
Free

Generate and store secure two-factor authentication codes for enhanced online account protection. Easily set up tokens via QR code scanning and access codes instantly with widgets and FaceID. Enjoy offline code generation and private browsing.

Secure 2FA code generationQR code setupSeamless device sync
🔧 Utilities
(58)
free with in-app purchases
19
Authenticator app - 2FA, MFA
Authenticator app - 2FA, MFA
Authenticator app - 2FA, MFA
Two Factor Authentication, OTP
Free

This app provides secure two-factor authentication for over 1000 popular online accounts. It offers quick access via widgets and Apple Watch, and ensures your data is safe with no internet exchange. Easily set up accounts by scanning QR codes or entering secret keys.

Two-factor authentication (2FA)Multi-factor authentication (MFA)Supports 1000+ apps
🔧 Utilities
(5.7K)
free with in-app purchases
20
Authenticator
Authenticator
Authenticator
Simple 2-factor authentication
Free

This app provides a secure and straightforward way to protect your online accounts. It generates one-time passwords that, when combined with your regular password, significantly enhance your account security. The app operates offline, ensuring your sensitive data remains on your device.

Generates one-time passwordsQR code setupEncrypted data storage
🔧 Utilities
(407)
free