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Watson vs klog: catalog facts
Watson	klog
Free Free and open source under the MIT licence.	Free Free and open source under the MIT licence.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Projects and tags with filtered reports Quick start and stop commands	Time data stays in readable plain-text files you own Published file format specification in the public domain
Command line only Requires Python	Command line only, no graphical interface Requires learning the file syntax
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account 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.