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TimeTagger vs Watson: catalog facts
TimeTagger	Watson
Freemium Self-hosting is free; the hosted service is paid after a 14-day free trial.	Free Free and open source under the MIT licence.
Web, Self-hosted	macOS, Linux, Command line
Interactive timeline for quick insight into spent time PDF and CSV reports suitable for client billing	Projects and tags with filtered reports Quick start and stop commands
Hosted service requires a paid subscription after the trial Pomodoro feature is experimental	Command line only Requires Python
Web application, Self-hosted, Hosted service	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
Not stated if an account is 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.