Buttercup

Buttercup is a beautifully-simple, open-source password manager designed for desktop (Windows, macOS, Linux), mobile (iOS, Android), and browser platforms (Chrome, Firefox, Edge). It uses strong encryption to securely protect your credentials under a single master password, enabling the use of complex passwords without memorization. Buttercup supports seamless synchronization across devices via encrypted vaults, providing a portable, secure password management experience with features like auto-lock and security overlays on mobile apps.

platform:web platform:macos platform:windows platform:linux platform:ios platform:android platform:chrome platform:firefox platform:edge pricing:free open_source form:desktop-app form:mobile-app form:browser-extension feature:encryption feature:multi-device-sync feature:auto-lock feature:security-overlay feature:open-source target:developers target:teams target:individuals use-case:security use-case:password-management