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Watson vs TimeTagger: catalog facts
Watson	TimeTagger
Free Free and open source under the MIT licence.	Freemium Self-hosting is free; the hosted service is paid after a 14-day free trial.
macOS, Linux, Command line	Web, Self-hosted
Projects and tags with filtered reports Quick start and stop commands	Interactive timeline for quick insight into spent time PDF and CSV reports suitable for client billing
Command line only Requires Python	Hosted service requires a paid subscription after the trial Pomodoro feature is experimental
Downloadable app	Web application, Self-hosted, Hosted service
Open source	Open source
License: MIT	License: GPL-3.0
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.