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WorldWide Telescope vs Cartes du Ciel (SkyChart): catalog facts
WorldWide Telescope	Cartes du Ciel (SkyChart)
Free Free and open source.	Free Free software under the GPL.
Web	Windows, macOS, Linux
Large collection of sky imagery in the browser Guided tours with narration and slides	Uses many star and deep-sky catalogues Shows planets, asteroids and comets
Needs a fast internet connection Interface can feel dense for newcomers	The number of settings can overwhelm casual stargazers Interface is functional rather than polished
Web application	Downloadable app
Open source	Open source
License not stated	License: GPL
Not stated if an account is needed	No account needed
Needs internet	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.