Buttercup

About

Buttercup is a free and open-source, privacy-focused password manager that utilizes a delta-system for managing archive changes and saving conflicts. It ensures the security of credentials by encrypting archives with AES 256bit using industry-standard methods. Available across multiple platforms including Mac, Windows, Linux, Android, iPhone, and as browser extensions for Google Chrome, Brave, and Firefox, Buttercup offers a comprehensive suite of features such as password encryption, a password generator, biometric authentication, autofill, encrypted notes, dark mode, offline functionality, and cloud synchronization via services like WebDAV and Dropbox. Built on Electron, it is praised by some users for its modern interface, cross-platform compatibility, and the enthusiastic support from its developers. However, it faces criticism for having fewer features compared to competitors like Keepass, reported instability on mobile applications (specifically iPhone), and installation issues on certain Linux distributions. Its development is open-source, with a presence on GitHub.