Etopa is a two-factor-authentication app, which runs as a web server and can be accessed using a web browser or using an Android app. You can use the Etopa.de instance or host your own.
Cost / License
- Free
- Open Source
Platforms
- Online
- Android



One of the most popular alternatives to YubiKey is 2FA Authenticator (2FAS), which is free and open source. Other popular alternatives are Authy, Nitrokey, OnlyKey and Microsoft Authenticator. You're spoiled for choice with Authenticators like YubiKey: we list more than 25 alternatives for Android, iPhone, iPad, Linux and Mac.
Etopa is a two-factor-authentication app, which runs as a web server and can be accessed using a web browser or using an Android app. You can use the Etopa.de instance or host your own.




Two-factor authentication app for Yandex accounts and also other QR-code based temporary codes for two-factor authentication



Location-based behavioral biometrics SDK and APIs for frictionless mobile identification verification and authentication.



Google Titan Security Keys offer two-factor authentication to prevent phishing and man-in-the-middle attacks. They support FIDO standards and come in USB-A, USB-C, and Bluetooth formats, ensuring compatibility with various devices and services.




Krypton implements the standardized FIDO Universal 2nd Factor (U2F) protocol to provide secure, un-phishable two-factor authentication on the web, using just your phone.




TOTP Authenticator makes it simple and easy to enable 2-factor authentication on your accounts. The app provides option to backup data offline or on the cloud. Features like Push to Chrome, dark theme, custom icons and widgets make the app stand out.



Sentinel is an elegant OTP Authenticator app for both iOS and MacOS. It relies only on the Apple's iCloud Keychain to share data across devices.




This app is created for use with the YubiKey NFC and NEO to copy One-time-passwords (OTPs) from a YubiKey into the iOS clipboard.

Fast, offline 2FA codes in your browser — TOTP two-factor authentication. Quick import from Google Authenticator.
