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Buttercup vs Enpass: catalog facts
Buttercup	Enpass
Free Free and open source, no longer developed.	Paid A paid subscription or one-time licence is required. A limited free tier exists on mobile.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Browser extension
Vaults are ordinary encrypted files you control, with no Buttercup account Installers for Windows, macOS and Linux, plus a portable Windows build	The vendor never holds your vault; sync goes through storage you choose One-time purchase option instead of a subscription
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	Sharing and recovery are weaker because there is no vendor-held vault Closed source
Downloadable app	Downloadable app, Browser extension
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 22, 2026

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