Duo mobile is described as 'Duo Mobile works with Duo Security's two-factor authentication service to make logins more secure. The application generates passcodes for login and can receive push notifications for easy, one-tap authentication' and is a Authenticator in the security & privacy category. There are more than 50 alternatives to Duo mobile for a variety of platforms, including iPhone, Android, iPad, Android Tablet and Mac apps. The best Duo mobile alternative is Proton Authenticator, which is both free and Open Source. Other great apps like Duo mobile are Aegis Authenticator, 2FA Authenticator (2FAS), Authy and Stratum.
Protect your accounts with Proton Authenticator, a private and secure cross-device two-factor authentication (2FA) that works offline. Created by Proton, the creators of Proton Mail, Proton VPN, Proton Drive, and Proton Pass.
Switzerland
Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens for your online services.
Netherlands
EU
2FAS Authenticator is a simple and free application for Two Factor Authentication (2FA Authentication) which generates Time-based One-time Passwords (TOTP) and PUSH authentication*.
United States
Manage two-factor authentication seamlessly across various platforms with secure cloud backups and offline access. From Gmail to LastPass, enhance security effortlessly. Sync multiple devices securely and protect sensitive data with robust encryption.
United States
Open-source authenticator for Android and Wear OS providing local, encrypted token storage, TOTP/HOTP support, and export options. No server communication, no corporate ties, and no data lock-in—prioritizing privacy, usability, backup, and secure multi-token management.
FreeOTP is a two-factor authentication application for systems utilizing one-time password protocols with support for Android (6 or later) and iOS (11 or later). Tokens can be added easily by scanning a QR-code or by manually entering in the token configuration.
United States
Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts.
United States
Tokn is a small, privacy-first 2FA / MFA authenticator. Your one-time codes stay on your device, encrypted. No accounts, no cloud sync, no analytics, no ads.
GermanyEU
Sign in is easy, convenient, and secure when you use Microsoft Authenticator. Use your phone, not your password, to log into your Microsoft account. You simply have to enter your username, then approve the notification sent to your phone.
United States
OnlyKey is an open source alternative to YubiKey. OnlyKey natively supports: a hardware password manager, multiple two-factor methods (FIDO2, TOTP, and Yubico® OTP), passwordless SSH login, and OpenPGP.
United States
OVault is a super simple OTP app that lets you view and manage OTPs for all your accounts. Set up OTPs by scanning QR codes with your devices Camera App, or by manually providing the OTP secret to the app.
United Kingdom
Open-source authenticator app for iOS and macOS generates time-based one-time passwords, supports secure iCloud sync and encrypted backup, FaceID and TouchID unlocking, QR code scanning, custom icons, search, handoff for copying codes, and encrypted export.
Morocco
