Stellarium is a free open-source planetarium software that shows a realistic sky in 3D, just like what you see with the naked...
Best GoSatWatch Alternatives ranked by AI · updated Aug 2026
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GoSatWatch is an iOS satellite-tracking app that predicts visible passes and displays satellites on maps and sky views. It is aimed at iPhone and iPad users who want dedicated pass alerts and tracking for the ISS and other satellites.
Top 6 GoSatWatch alternatives
Heavens Above is a popular website that provides information about satellite and ISS sightings, astronomy events, and space exploration news.
ISS Detector is a mobile app that predicts visible International Space Station and satellite passes for observers. It combines pass times, weather...
Pros
- More focused on ISS and satellite passes than general astronomy apps
- Combines visibility forecasts with weather and cloud-cover data
- Augmented-reality view helps identify where to look
Cons
- Free version includes advertising and feature restrictions
- Less capable for general star, planet, and deep-sky observation than Stellarium
- Interface is more utilitarian than Sky Tonight or Star Walk
Free with ads; Pro upgrade
4
Sky Tonight
Vito Technology
Sky Tonight is a mobile stargazing guide that identifies stars, planets, constellations, and satellites using an interactive sky map. It is built...
Pros
- Makes identifying objects in the sky easier than the NASA App
- Includes augmented-reality sky viewing, event calendars, and visibility forecasts
- Offers a more focused experience for local stargazing
Cons
- Has substantially less NASA news and mission reporting
- Many advanced features require a purchase or subscription
- Less suitable for following long-running NASA programs
Freemium, paid upgrades
5
Look4Sat
rt-bishop
Look4Sat is an open-source Android satellite tracker that calculates visible passes from current orbital data. It targets observers who want a lightweight,...
Pros
- Free and open source with no subscription requirement
- More lightweight and privacy-friendly than commercial astronomy apps
- Provides pass predictions for ISS and many other satellites
Cons
- Android-only and less polished than the leading commercial apps
- No comparable iOS app or rich web interface
- Lacks ISS Detector's integrated weather presentation
Free, open source
6
N2YO.com
N2YO.com
N2YO.com is an online satellite-tracking service with real-time positions, orbital maps, and visible-pass predictions. It serves satellite enthusiasts who need broad catalog...
Pros
- Tracks a very broad range of satellites beyond the ISS
- Works directly in a browser without requiring a mobile installation
- Provides real-time maps, orbital data, and location-specific passes
Cons
- Less convenient for quick outdoor use than ISS Detector's mobile interface
- Visual design is more technical and dated than Sky Tonight
- Weather and cloud information are less integrated
Free; optional membership
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