CloudOTP is described as 'An awesome two-factor authenticator based on Flutter, supports Android, Windows and Linux platforms, and supports multiple cloud backup methods such as Onedrive, Dropbox, WebDAV, S3Cloud, etc' and is an app. There are more than 25 alternatives to CloudOTP for a variety of platforms, including Android, iPhone, Linux, Mac and Windows apps. The best CloudOTP alternative is Ente Auth, which is both free and Open Source. Other great apps like CloudOTP are Bitwarden Authenticator, Authy, Google Authenticator and Authenticator Extension.