Best Duo Security App

250+ iOS apps curated and reviewed

4.3 avg rating
20 free apps
Updated October 2026

Duo Mobile is the household name in duo security app, but it's far from the only option. We track 250+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Duo Security App (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Duo MobileDuo MobileFree4.9★ (2.3M)NoNoOct 2026
2Microsoft AuthenticatorMicrosoft AuthenticatorFree4.7★ (703K)NoNoOct 2026
3Authenticator: MFA Auth & TOTPAuthenticator: MFA Auth & TOTPFree5.0★ (1)NoYesOct 2026
4Total Connect 2.0Total Connect 2.0Free4.6★ (286K)NoNoOct 2026
5Google AuthenticatorGoogle AuthenticatorFree4.9★ (1.2M)NoNoOct 2026
6Authenticator App - OneAuthAuthenticator App - OneAuthFree4.7★ (34K)NoNoOct 2026
7ADT+ADT+Free4.8★ (59K)NoNoOct 2026
8Lorex ClassicLorex ClassicFree4.6★ (25K)NoNoOct 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😐(2.3M ratings)
Free
#16in Business
Duo Mobile screenshot 1
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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
  • 👍 Straightforward and user-friendly
  • 👍 Easy to set up and use

Room to Improve

  • 🐛 Unreliable notifications and push functionality
  • 🐛 Compatibility issues when changing devices
  • 🐛 Slow and frustrating authentication process
  • 🐛 Confusing and non-intuitive user interface
  • 🐛 Forced use of the app causing inconvenience
  • 🐛 Inability to remove or deactivate the app
Microsoft Authenticator#2

Microsoft Authenticator by Microsoft Corporation

Protects your online identity
Strong Contender
📊 Productivity
4.7😞(703K ratings)
Free
#6in Productivity
Microsoft Authenticator screenshot 1
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Microsoft Authenticator screenshot 4
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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
  • 🐛 Accounts disappearing after phone change
Authenticator: MFA Auth & TOTP#3

Authenticator: MFA Auth & TOTP by Ditlev Carlsen

2 Step Authentication: 2FA OTP
Worth Considering
🔧 Utilities
5.0(1 ratings)
FreeIn-App Purchases
Authenticator: MFA Auth & TOTP screenshot 1
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This app generates one-time passwords (OTPs) to add an extra layer of security to your online accounts. It supports time-based OTPs for various popular services and offers quick setup via QR code scanning. Designed for privacy and security, it helps protect your data from unauthorized access.

More Duo Security App apps to explore

FAQ about Duo Security App

What is the best duo security app for iPhone?
Duo Mobile tops our duo security app ranking as of October 2026, with a 4.9-star average from 2.3M 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 October 2026.
We track 250+ duo security app on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.