Etopa is described as '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' and is an app. There are more than 50 alternatives to Etopa for a variety of platforms, including iPhone, Android, iPad, Android Tablet and Mac apps. The best Etopa alternative is Aegis Authenticator, which is both free and Open Source. Other great apps like Etopa are Proton Authenticator, Ente Auth, 2FA Authenticator (2FAS) and Authy.