Best Duo Gsu Apps

235+ iOS apps curated and reviewed

4.3 avg rating
20 free apps
Updated May 2026

With an average user rating of 4.3★, the duo gsu category is one of the App Store's strongest. Browse all 235+ apps we track, sorted so the most loved ones surface first.

Top Picks for Duo Gsu

Duo Mobile#1

Duo Mobile by Duo Security LLC

Security made simple
Editor's Choice
💼 Business
4.9😐(2.1M ratings)
Free
#8in Business
Duo Mobile screenshot 1
Duo Mobile screenshot 2
Duo Mobile screenshot 3
Duo Mobile screenshot 4

"Duo Mobile simplifies security by generating passcodes for two-factor authentication and providing easy, one-tap login authentication through push notifications on iOS devices. It also manages two-factor authentication for various other services and applications. Activate and link the app to your Duo account to start using its features."

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
Authenticator App ™#2

Authenticator App ™ by Codenhagen.IO ApS

Two Factor Authentication
Strong Contender
🔧 Utilities
4.4😞(21K ratings)
FreeIn-App Purchases
Authenticator App ™ screenshot 1
Authenticator App ™ screenshot 2
Authenticator App ™ screenshot 3
Authenticator App ™ screenshot 4
Authenticator App ™ screenshot 5
Authenticator App ™ screenshot 6

Secure your online accounts with an advanced two-factor authentication app that generates time-based codes for enhanced security when logging in. Compatible with over 2,500 websites, streamline your multi-factor authentication setup by scanning QR codes.

What We Love

  • 👍 Easy to use
  • 🚀 Works well
  • 👍 Simple and straightforward
  • 🚀 Functional tool

Room to Improve

  • 🐛 Unable to remove accounts
  • 🐛 Difficult to cancel subscription
  • 🐛 Doesn't work as expected
2FA Authenticator (2FAS)#3

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

#1 Rated 2FA Authenticator
Worth Considering
📊 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

A secure two-factor authentication app that generates codes for additional account security. Protect your online accounts with an extra layer of verification.

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

More Duo Gsu apps to explore

4
Authenticator ·
Authenticator ·
Authenticator ·
2FA, Two Factor Authentication
Free

Secure your online accounts with Authenticator 7, an app that stores and generates secure 2FA tokens for added account protection. Safeguard your accounts from hackers with this easy-to-use two-factor authentication solution.

🔧 Utilities
(26K)
5
RSA Authenticator (SecurID)
RSA Authenticator (SecurID)
RSA Authenticator (SecurID)
by RSA Security
Free

This app provides strong authentication through OTP credentials, cloud-based MFA, push notifications, and biometrics for enhanced security. It is suitable for iOS and macOS users looking for a secure and convenient authentication solution. Check the App Store for more information.

💼 Business
(319)
6
Authenticator app - 2FA, MFA
Authenticator app - 2FA, MFA
Authenticator app - 2FA, MFA
Two Factor Authentication, OTP
Free

Protect your accounts with our free authenticator app that offers 2FA security for various platforms. With support for over 1000 apps, including Apple Watch compatibility, ensure your accounts are secure.

🔧 Utilities
(4.9K)
7
UniFi Verify
UniFi Verify
UniFi Verify
Secure Your Identity
Free

Enhance your account security with an app that provides two-factor authentication (2FA) for all your logins. Instant setup via QR code, support for multiple accounts and platforms, time-sensitive verification codes, and single-use passwords make this app a must-have for securing your online identity.

💼 Business
(11K)
8
Google Authenticator
Google Authenticator
Google Authenticator
by Google
Free

A secure two-step verification app that generates codes for logging into online accounts, adding an extra layer of security beyond passwords. Easily sync codes across devices, set up accounts with QR codes, and manage multiple accounts in one place. To start securing your accounts, enable 2-Step Verification on your Google Account.

🔧 Utilities
(1M)
9
Authenticator ® App
Authenticator ® App
Authenticator ® App
Two Factor Authentication Aрр
Free

Enhance your online security with our all-in-one mobile Authenticator App for 2FA and MFA authentication. Simply scan a QR code to secure your accounts with time-sensitive codes, cloud backups, privacy features, and more. Download today for peace of mind in the digital world!

📊 Productivity
(3K)
10
Authenticator App+
Authenticator App+
Authenticator App+
2FA Two Factor Authentication
Free

Secure all your online accounts with our Authenticator App. Easily scan, generate, and save 2FA codes for enhanced security. Download now for peace of mind online!

📊 Productivity
(12K)
11
LastPass Password Manager
LastPass Password Manager
LastPass Password Manager
Store & Autofill Passwords
Free

A secure password management app that stores, organizes, and autofills passwords across devices, ensuring convenient and safe access to online accounts. Protect your digital identity with ease and efficiency.

📊 Productivity
(1.3K)
12
Microsoft Authenticator
Microsoft Authenticator
Microsoft Authenticator
Protects your online identity
Free

A secure app for easy online account sign-ins, offering multi-factor authentication, passwordless login, and password autofill features. Manage Microsoft and non-Microsoft accounts with added security layers like fingerprint, face ID, or PIN. Stay protected and simplify access to various online services.

📊 Productivity
(652K)
13
Authenticator App-2FAS・MFA・OTP
Authenticator App-2FAS・MFA・OTP
Authenticator App-2FAS・MFA・OTP
Two Factor Authentication・TOTP
Free

Get secure two-factor authentication and safeguard your online accounts with our app, which provides effortless setup, biometric authentication, and cloud backups for your time-based one-time passcodes. Download and secure your digital life today!

🔧 Utilities
(400)
14
Authenticator ©
Authenticator ©
Authenticator ©
Authenticator app, 2fa
Free

Protect your online accounts with our secure Two-Factor Authentication app. Easily add accounts by scanning QR codes or entering them manually, and manage passwords with our password management feature. Secure your accounts today!

💼 Business
(2.3K)
15
Authenticator App
Authenticator App
Authenticator App
2FA Authentication MFA & OTP
Free

Protect your accounts with an advanced authentication app offering both Two-Factor Authentication (2FA) and Multi-Factor Authentication (MFA) features. Secure your online presence now.

📊 Productivity
(46K)
16
Dual App - Duo Web Scanner
Dual App - Duo Web Scanner
Dual App - Duo Web Scanner
Dual App Backup Deleted Msgs
Free

Introducing an app that lets you manage multiple WhatsApp accounts on one device, making it easy to switch between personal and business conversations. Back up and recover chat messages, create custom stickers and statuses, and enhance your messages with fancy fonts and text effects. Stay secure with a password lock feature, and enjoy direct chat messaging without adding contacts. Find out more and download now!

🌐 Social Networking
(884)
17
OneLogin Protect
OneLogin Protect
OneLogin Protect
by OneLogin, LLC
Free

Ensure the security of your online accounts with a free MFA app that provides two-factor authentication for OneLogin SSO accounts and third-party apps. Features include push notifications, Touch ID/Face ID verification, and TOTP code generation every 30 seconds. For more information, visit onelogin.com/onelogin-protect-authenticator.

💼 Business
(561)
18
Authenticator App - Authkey
Authenticator App - Authkey
Authenticator App - Authkey
Two factor authentication, 2fa
Free

A comprehensive 2FA app designed to enhance online security by generating unique access codes for account protection, ensuring the safety of personal information. Secure your accounts easily and reliably with our advanced security protocols.

🔧 Utilities
(3.3K)
19
Twilio Authy
Twilio Authy
Twilio Authy
by Authy Inc.
Free

A two-factor authentication app for iPhone and iPad, Authy ensures secure account protection through multi-device synchronization, secure cloud backups, and offline token generation. Protect all major accounts and bitcoins with Authy's trusted security features. Visit the website to enhance your account security today: https://www.authy.com.

🔧 Utilities
(52K)
20
SecureAuth Authenticate
SecureAuth Authenticate
SecureAuth Authenticate
by SecureAuth Corporation
Free

SecureAuth Authenticate is a modern mobile app for secure identity verification and accessing apps with multi-factor authentication. It offers personal and business features, including generating one-time passcodes and supporting account security for various apps. Get started with SecureAuth Authenticate at https://www.secureauth.com/secureauth-authenticate.

💼 Business
(6)