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ButtercupKeeWeb
Free

Free and open source, no longer developed.

 Free

Free and open source under the MIT licence.

Windows, macOS, Linux Windows, macOS, Linux, Web
  • Vaults are ordinary encrypted files you control, with no Buttercup account
  • Installers for Windows, macOS and Linux, plus a portable Windows build
  • Same kdbx files as KeePass, with a far more modern interface
  • Opens databases directly from cloud storage or WebDAV
  • The project has ended; no updates or security fixes will follow the September 2024 release
  • Issues and pull requests are ignored, so bugs will not be fixed
  • Upstream development has been slow for some time
  • The web version means trusting a page with your vault in memory
Downloadable app Downloadable app, Web application
Open source Open source
License: GPL-3.0 License: MIT
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 26, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.