Buttercup is described as 'Uses a delta-system to manage archive changes and save conflicts. The archive, upon saving, is encrypted with AES 256bit to ensure the security of your credentials. Buttercup uses industry standard methods and configuration for encryption to ensure that there are no' and is a popular password manager in the security & privacy category. There are more than 100 alternatives to Buttercup for a variety of platforms, including Windows, Mac, Android, iPhone and Web-based apps. The best Buttercup alternative is Bitwarden, which is both free and Open Source. Other great apps like Buttercup are KeePassXC, KeePass, Proton Pass and LastPass.