AstroAlert icon
AstroAlert icon

AstroAlert

AstroAlert is a mobile app that tells you exactly when a satellite, planet, comet, or deep-sky object will pass directly above your location (over 70° altitude).

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Cost / License

  • Freemium (Subscription)
  • Proprietary

Platforms

  • iPhone
  • iPad
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AstroAlert information

  • Developed by

    FR flagMobulding

  • Licensing

    Proprietary and Freemium product.

  • Pricing

    Subscription that costs $3 per month + free version with limited functionality.

  • Alternatives

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  • Supported Languages

    • English
    • French

AlternativeTo Category

Education & Reference

Apple AppStore

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AstroAlert was added to AlternativeTo by Mobulding on and this page was last updated .
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What is AstroAlert?

Unlike most astronomy apps that show hundreds of low-visibility events, AstroAlert focuses only on spectacular, highly visible passes — the ones worth stepping outside for.

? Why AstroAlert stands out Shows only the passes that are actually visible (above 70°) Covers satellites, planets, comets, and deep-sky objects in one place Includes 600+ satellites (visual, active, LEO, Starlink) Uses precise JPL & NASA Horizons ephemerides Daily personalized alerts based on your location (Premium) Includes a full astronomy glossary + NASA Picture of the Day Clean, immersive interface inspired by mission control

🛰? What AstroAlert does Computes the next 24h of sky events for your exact coordinates Highlights “don’t-miss” events (>80°) Shows object name, culmination time, altitude, and type Lets you explore educational sheets for 1,000+ celestial objects (Premium)

📡 Technology Satellite positions from latest TLEs (Skyfield) Planetary positions from JPL DE ephemerides Comet trajectories from NASA Horizons Deep-sky objects from fixed RA/Dec catalogs Local time zone + geolocation aware Daily Python pipeline generates user-specific events