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KStars vs Sky Map: catalog facts
KStars	Sky Map
Free Free and open source from the KDE community.	Free Free and open source under the GPL 3.0 or later licence.
Windows, macOS, Linux	Android
Sky simulation with up to 100 million stars, plus comets and asteroids Observation planner and calculation tools such as conjunction prediction	Real-time identification using the phone's sensors Long history, maintained by the original developers
The large feature set takes time to learn Some information and imagery features rely on internet resources	The classic interface looks dated, as the developers acknowledge Accuracy depends on the phone's compass and sensors
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
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.