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arbtt vs Memtime: catalog facts
arbtt	Memtime
Free Free and open source under the GPL-2.0 licence.	Paid Paid software with a free 14-day trial, no credit card required.
macOS, Linux, Command line	Windows, macOS
Fully automatic capture with no manual input Rules applied at query time so old data can be re-analysed	Records time automatically without start and stop timers Activity data stays on the device
Requires writing a rules file to get useful statistics Command-line only, no graphical reports	Closed source Paid after the trial
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	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.