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.
🚀 Hello Product Hunt!
I’m thrilled to introduce AstroAlert — a project I built because I always missed spectacular satellite passes without knowing they were happening above me.
AstroAlert calculates all major sky events for your exact location: satellites, planets, comets and even deep-sky objects.
I’d love your feedback: what celestial object would YOU like to track next?
Happy to answer every question! ✨
This looks like a really cool app, wow!! 🤩 Congrats on the launch!
This would be so useful for stargazers and people who are just curious about what deep sky objects may be visible etc. Love how the images are shown too for galaxies etc. Would you eventually expand to add constellations in the future? So that the app could showcase what major constellations would be visible. Am curious!
Finally a simple way to know what’s actually happening in the sky right above you. Super handy for catching those rare “blink and you miss it” passes. Do you plan to add alerts for really special events - like ISS flares or unusually bright flyovers - so people don’t miss them?
Thank you all so much — we just passed 80 upvotes! 🚀✨ I really appreciate the support. If you have any questions, feedback, or ideas, feel free to ask — I’m here all day and happy to chat! 🙌
This is quite amazing. How do you know the location? Do you ask for location permission?
Love the idea! Will this be available on Android or web browser at some point?
About AstroAlert on Product Hunt
“Know exactly when satellites pass above you.”
AstroAlert launched on Product Hunt on November 27th, 2025 and earned 116 upvotes and 16 comments, placing #7 on the daily leaderboard. 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 was featured in Productivity (649.7k followers), Education (78.4k followers) and Science (1.3k followers) on Product Hunt. Together, these topics include over 153.2k products, making this a competitive space to launch in.
Who hunted AstroAlert?
AstroAlert was hunted by Théo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how AstroAlert stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
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