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WorldWide Telescope vs Gaia Sky: catalog facts
WorldWide Telescope	Gaia Sky
Free Free and open source.	Free Free and open source under the MPL-2.0.
Web	Windows, macOS, Linux
Large collection of sky imagery in the browser Guided tours with narration and slides	Uses real scientific catalogs including Gaia star data Handles around a billion objects in real time
Needs a fast internet connection Interface can feel dense for newcomers	Large datasets need significant download space and capable hardware Aimed at scientific exploration rather than a guided planetarium experience
Web application	Downloadable app
Open source	Open source
License not stated	License: MPL-2.0
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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