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Mater vs Flowkeeper: catalog facts
Mater	Flowkeeper
Free Free and open source under the MIT licence.	Free The open-source software is available without a license fee. Hosting, hardware and…
macOS	Windows, macOS, Linux
Unobtrusive menu bar interface Time can be adjusted by dragging while running	Provides keyboard shortcuts and configurable work sessions.
macOS only No published GitHub releases	It is a focus timer rather than a full project-management system.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
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 October 2, 2026	Official website Full listing and sources Checked September 22, 2026

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