Compare software

astroterm vs KStars: catalog facts
astroterm	KStars
Free Free and open source under the MIT license.	Free Free and open source from the KDE community.
Command line	Windows, macOS, Linux
Explores sky views at different dates, times, and locations Shows stars, planets, moon phases, and constellations	Sky simulation with up to 100 million stars, plus comets and asteroids Observation planner and calculation tools such as conjunction prediction
Displays the sky using terminal graphics.	The large feature set takes time to learn Some information and imagery features rely on internet resources
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 23, 2026

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