Buttercup 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 weaknesses in the locking/unlocking process of your archives. No personal data is collected by Buttercup and no accounts are required.
Can store password archives in Dropbox, ownCloud, Nextcloud and WebDAV for remote use / sharing - your credentials are completely controlled by you and available anywhere that you have internet connection. The desktop application supports offline archives by saving files locally. The mobile application supports in-browser login auto-filling.