Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens for your online services.




OTPClient is described as 'GTK+ application for securely managing TOTP & HOTP tokens. Content is encrypted on disk using AES256-GCM. Master password derived using PBKDF2 with 100k iterations & SHA512 as hash algorithm. Can import encrypted backups from andOTP & Authenticator+' and is a Authenticator in the security & privacy category. There are more than 25 alternatives to OTPClient for a variety of platforms, including Android, iPhone, Linux, Android Tablet and iPad apps. The best OTPClient alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like OTPClient are Proton Authenticator, Bitwarden Authenticator, 2FA Authenticator (2FAS) and Authy.
Aegis Authenticator is a free, secure and open source app to manage your 2-step verification tokens for your online services.




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.




Bitwarden Authenticator generates verification codes for two-factor authentication, ensuring your identity is verified when you log into accounts.




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*.




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.




Google Authenticator generates 2-Step Verification codes on your phone.




It implements Time-based One-time Passwords (TOTP) and HMAC-Based One-Time Passwords (HOTP). Simply scan the QR code and login with the generated 6-digit code.




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.




A free open-source two factor authentication app for Android. It features encrypted backups, icons, categories and a high level of customisation. It also has a Wear OS companion app.




Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts.



The multi-protocol security key offers the highest assurance, protecting devices with passwordless workflows and strong 2FA against phishing. It plugs into computers, tablets, and mobile devices, integrates PIN or biometric for identity verification, and reduces helpdesk costs.



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.



