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The most feature-rich free astronomy software

KStars caters to a wide-variety of use cases. Whether you are a student, an educator, an amateur astronomer or an astronomy enthusiast, you will find tools in KStars that are useful to you. Have a look at the Features page for a full listing of features, organized by use case.

Graphical simulation of the sky with the planets, up to 100 million stars, 10000 deep-sky objects, comets and asteroids. Adjustable simulation rate.

Access to several internet resources for information, imagery and data

Complete astrophotography workflow

A host of tools that predict conjunctions, plot time variation of positions of planets, perform calculations etc.

Powerful observation planner to plan your observations