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