AstroAlert
Know exactly when satellites pass above you.
AstroAlert launched on November 27, 2025 with 113 votes, #288 of 9,796 launches that month and more than 95% of that year's launches.
What it does
AstroAlert is your personal sky-watch assistant. It tells you exactly which satellites, planets, comets, and deep-sky objects will pass right above your location in the next 24 hours — including spectacular zenith events above 70°. Powered by NASA/JPL data, it combines real-time calculations with educational content, a full astronomy glossary, and detailed object sheets. The sky above you, revealed with precision.
AstroAlert is the mobile app that shows satellite pass alerts, planets and deep-sky objects above you. Automatic alerts and detailed object sheets included.
Know exactly which satellites, planets, comets or deep-sky objects are passing above you — and learn something fascinating about the Universe every single day. AstroAlert automatically calculates the most remarkable sky events visible from your location, using your latitude, longitude and time zone. Only objects rising above 70° altitude are selected, ensuring you see only the most impressive and worthwhile sky shows. From the brightest satellites to massive constellations like Starlink, AstroAlert analyzes fresh orbital data every day. See which spacecraft are actually passing above you, their trajectories, their purpose — and even the story behind each one. AstroAlert covers the major…from astroalert.app
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I really like Stellarium and SkySafari but I felt like these are primarily geared towards exploring the sky but not so much "here are the long list of things I want to see, when can I see them tonight and where". There's also not really a great option I've found that combines sky object planning + location weather details while still being free so I built this. The UI's heavily inspired by NINAs sky atlas + Robinhood. Right now you can: View the altitude chart of objects and 3D view Create lists of objects of interest View the annual max/min daily altitude of an object to find the best…
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