AstroAlert
Know exactly when satellites pass above you.
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Théo

AstroAlert - Know exactly when satellites pass above you.

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AstroAlert
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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.

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Théo
Maker
📌
🚀 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! ✨
Sean Tiffonnet ▲

Love the idea! Will this be available on Android or web browser at some point?

Théo
Maker

@seantiffonnet Thank you! 🙌
Yes — the Android version is already in closed testing and will be available in the next few days.
A web version is also planned right after the Android rollout. 🚀

Silvia O'Dwyer

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!

Théo
Maker

@silvia_odwyer1 Thank you so much! 🙌 Really appreciate the kind words.

And yes — constellations are definitely planned!
I’m already working on expanding the app to include major constellations, with visibility info just like for planets, satellites and deep-sky objects.

Lots more coming very soon 😊

Chilarai M

This is quite amazing. How do you know the location? Do you ask for location permission?

Théo
Maker

@chilarai Thank you! 🙌
Yes — the app asks for location permission the very first time, but it's entirely optional after ! You can disable it.

Théo
Maker

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! 🙌

Evgenii Zaitsev

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?

Théo
Maker

@evgenii_zaitsev1 Thank you so much — that’s exactly the goal of the app!
And yes, absolutely: I’m planning to add special-event alerts soon, including rare visibility moments (the ISS is already in the app 😉).

I want AstroAlert to make sure people never miss those “once in a while” sky events. 🚀
Really appreciate the feedback!

Bud Broesky-Herron
satalert wouldve been a great name
Théo
Maker

@budb Haha true, that’s actually a really good name! 😄
I hesitated a lot while naming the app — maybe I’ll keep Satalert in mind for a future feature or companion tool!

Thanks for the idea! 🚀

Paul Tseluyko

Did you vibe code it? With which tool?

Théo
Maker

@pasha_tseluyko Not really “vibe coded” 😄
I used a mix of tools: FlutterFlow for the app, Firebase for the backend, and a lot of Python running on my VPS for all the orbital calculations.
ChatGPT helped a ton along the way, but everything is fully custom-built.

OJ Designz

After getting Starlink I became more interested in seeing what satellites were affecting signal, this is an awesome way to tell! Perhaps this can help me to know when space junk falls on my head too :P

Théo
Maker

🚀 Update: AstroAlert is now available on Android!
You can download it here 👉 https://play.google.com/store/apps/details?id=com.astroalert

Thanks again for all the support — happy sky watching 🌌