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Mater vs Vitamin-R: catalog facts
Mater	Vitamin-R
Free Free and open source under the MIT licence.	Paid One-time purchase with a 14-day free trial.
macOS	macOS
Unobtrusive menu bar interface Time can be adjusted by dragging while running	Structured focus sessions with a clear objective Quick capture of distractions during a session
macOS only No published GitHub releases	macOS only Paid after the 14-day trial
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	No account 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 October 2, 2026

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