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arbtt vs Time Sink: catalog facts
arbtt	Time Sink
Free Free and open source under the GPL-2.0 licence.	Paid $5 with at least a year of updates and a perpetual license; free trial available.
macOS, Linux, Command line	macOS
Fully automatic capture with no manual input Rules applied at query time so old data can be re-analysed	Automatic tracking per app and per window Pools group related activity
Requires writing a rules file to get useful statistics Command-line only, no graphical reports	macOS only Tracks one Mac, not a team
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	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 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.