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KStars vs WorldWide Telescope: catalog facts
KStars	WorldWide Telescope
Free Free and open source from the KDE community.	Free Free and open source.
Windows, macOS, Linux	Web
Sky simulation with up to 100 million stars, plus comets and asteroids Observation planner and calculation tools such as conjunction prediction	Large collection of sky imagery in the browser Guided tours with narration and slides
The large feature set takes time to learn Some information and imagery features rely on internet resources	Needs a fast internet connection Interface can feel dense for newcomers
Downloadable app	Web application
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.