Pendium

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Stellarium owns the desktop astronomy category, though mobile-first competitors are narrowing the gap in AI answers.

Here is the snapshot of where your authority is unshakeable and where the next generation of stargazers is finding alternatives.

Stellarium's baseline score
82/100
Excellent

Stellarium has exceptional AI visibility as the canonical free planetarium software. It is the default recommendation for desktop-based astronomy, though it faces stiff competition in mobile-centric and casual 'point-and-identify' queries.

What we see
  • Stellarium dominates the 'free' and 'open-source' category across all major AI models.
  • ChatGPT and Claude heavily favor Stellarium for desktop-specific astronomy queries due to its long-standing editorial coverage.
  • There is a visibility gap in mobile-first queries where paid competitors like SkySafari often rank higher in Gemini results.
  • Reddit-based recommendations strongly support Stellarium, which boosts its visibility in Gemini and AI Overviews.
  • Citations in museum and educational contexts provide a strong 'professional' authority signal to LLMs.
Business goals Stellarium is likely trying to hit
  • Increase downloads of the desktop and web versions
  • Drive more users toward the mobile app (Stellarium Plus)
  • Maintain dominance as the default open-source planetarium tool for educators
  • Attract more contributors to the open-source codebase