Horizon Alert
Real-time sky alerts near you
About
Get real-time alerts for celestial events visible from your location, including rocket launches, ISS passes, and meteor showers. The app provides precise timing, direction, and visibility intelligence, such as cloud cover, to ensure you don't miss any opportunities to look up.
What's New in Horizon Alert
1.0.3
July 22, 2026
Point your phone at the sky — introducing the new Sky view. • New Sky tab: hold your phone up to identify planets, the Moon (and its current phase), and bright stars in real time. • The main feed is now "Up Next" — clearer about what's coming. • You'll now see a heads-up when the feed can't refresh, so you always know when you're viewing saved events. • Haptics and reliability improvements throughout.
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FAQ
What celestial events does Horizon Alert notify me about?
Horizon Alert notifies you about rocket launches, ISS passes, meteor showers, eclipses, and spacewalks. It focuses on events that are actually visible from your current location.
How does Horizon Alert determine visibility?
Horizon Alert uses real visibility intelligence, including cloud cover at launch time fetched per location, sun elevation to filter out daylight events, and distance from the launch pad. This ensures you receive accurate alerts.
Can I customize when I receive alerts for events?
Yes, you can choose your alert timings for events, with options ranging from 1 day, 12 hours, 2 hours, 30 minutes, 10 minutes, or T-zero. Notifications can also auto-cancel if conditions degrade.
Does Horizon Alert require an account or track my data?
No, Horizon Alert is built privacy-first. It does not require accounts or analytics, and no third-party tracking is involved. Your location stays on your device, with only rounded latitude and longitude sent for cloud forecasts.
What devices is Horizon Alert available on?
Horizon Alert is available on iPhone and iPad devices. It features a clean, dark-mode-native experience.
How often is Horizon Alert updated?
The latest version of Horizon Alert is 1.0.3, and it was last updated on July 22, 2026. Updates typically include improvements and new features based on user feedback and astronomical data.
Is Horizon Alert suitable for children?
Horizon Alert has an age rating of 4+, making it suitable for children. Its focus on educational and observational content about space makes it a great tool for young enthusiasts.
Does Horizon Alert have ads?
No, Horizon Alert does not contain advertisements. It offers a clean, uninterrupted experience for users interested in sky events.