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KStars vs astroterm: catalog facts
KStars	astroterm
Free Free and open source from the KDE community.	Free Free and open source under the MIT license.
Windows, macOS, Linux	Command line
Sky simulation with up to 100 million stars, plus comets and asteroids Observation planner and calculation tools such as conjunction prediction	Explores sky views at different dates, times, and locations Shows stars, planets, moon phases, and constellations
The large feature set takes time to learn Some information and imagery features rely on internet resources	Displays the sky using terminal graphics.
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is 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 8, 2026

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