ISS Detector

ISS Detector is a practical pass-prediction app for anyone who wants to catch the International Space Station and other objects from a chosen location. It is best for observers who value precise viewing times, advance alerts, and a weather check over a full planetarium or sky-mapping suite.

Overview

For each upcoming ISS pass, the app supplies local start time, direction, highest altitude, and duration. A notification arrives minutes before the event, so the app works as a timely prompt rather than a forecast you must remember to revisit. Its local weather check indicates when cloud may block the sighting; that is useful planning context, though it cannot guarantee clear conditions. Sightings can be shared on social media.

ISS Detector says it combines data from NASA, Heavens-Above, the Minor Planet Center, and yr.no weather. Its privacy policy says location calculations occur on-device and precise location is not stored on the maker’s servers. It also says users can request access to or deletion of data linked to an anonymous user ID under GDPR. Google Play says data cannot be deleted, creating a significant concern for Android users who require an unambiguous deletion route.

Key features

• Pass predictions and alerts: Timing, direction, peak altitude, and duration let you decide whether a pass merits stepping outside or setting up equipment. Minute-before notifications reduce the chance of missing a short viewing window.
• Weather context: The forecast warning helps avoid planning around a pass hidden by clouds. It is a useful filter, not a substitute for checking changing local conditions.
• Expanded object tracking: Premium adds Starlink, Hubble, rocket bodies, planets, comets, and amateur radio satellites. That gives committed observers substantially more to follow than ISS-only predictions.
• Amateur radio data: Radio-satellite tracking includes transmitter information and Doppler-shift calculations, making Pro more relevant to radio operators than a basic visual-tracking app.
• Data and privacy controls: Anonymous user IDs and subscription status are described as securely stored with industry-standard security measures. Services named in the privacy policy include Space-Track for orbital data, RevenueCat for subscriptions, Google Analytics and Firebase for statistics, met.no for weather, and the Minor Planet Center for comet and celestial data.

Pricing

The freemium ISS Detector Satellite Tracker plan costs free, contains ads, and includes in-app purchases. It is the sensible starting point for occasional ISS viewers who only need core pass information, alerts, and weather context. Ads and the narrower object selection are the trade-offs.

ISS Detector Pro costs $17.99, paid once. The one-time purchase includes all extensions and removes ads, while unlocking the expanded object catalogue and amateur-radio tracking. It fits frequent observers and radio users who will use those additions; casual viewers may not recover the cost from features they rarely open. No seat, quota, or trial terms are given.

Platforms

ISS Detector has cross-platform coverage on Android, iOS, macOS, and the web. That breadth suits households or enthusiasts who switch between mobile and desktop devices, although the Google Play deletion caveat matters specifically to Android users.

Who it's for

Choose it if your main goal is knowing when and where an ISS or satellite pass will occur, receiving a last-minute reminder, and checking whether clouds make the attempt worthwhile. Pro is aimed at enthusiasts tracking many object types or amateur-radio satellites. It is less suitable if you want a rich interactive planetarium, a broad educational astronomy environment, or a clearly resolved Android data-deletion process.

Pros and cons

Pros

• Actionable pass information: Direction, altitude, duration, and local timing turn predictions into an observation plan.
• Useful reminders: Notifications minutes before a pass help prevent missed events.
• Weather-aware planning: Cloud warnings can save a wasted trip outside.
• Strong Pro scope: Starlink, Hubble, planets, comets, rocket bodies, and radio-satellite calculations cover varied interests.
• One-time Pro price: The 17.99 USD purchase avoids a recurring subscription.

Cons

• Free edition carries ads and in-app purchases: The no-cost tier is less polished and limits expanded tracking.
• Deletion inconsistency: GDPR deletion requests are described in the privacy policy, while Google Play says data cannot be deleted.
• Weather is only an indicator: Cloud forecasts cannot ensure a visible pass.

Alternatives

Browse the Astronomy Apps list for more choices. Pick NASA Eyes instead if you want a free browser-based experience across Android, iOS, Linux, macOS, web, and Windows and do not mind requiring an internet connection. Celestia is the better choice for free, open-source software with mobile frontends and broad desktop coverage.

Choose SkyORB if you want a freemium astronomy app spanning Android, iOS, macOS, and Windows, including a free Classic edition and a 4.99 USD one-time iOS/tvOS/Apple Watch option. Solar System Scope suits users seeking a freemium solar-system experience on web, desktop, and mobile. Cosmic Watch offers sky, Earth, and solar-system views with notifications, including a free tier and a 0.99 USD monthly plan.

Star Chart is preferable if you want every feature and upgrade in a free app without subscriptions or paywalls. Choose Stellarium for free astronomy software on Linux, macOS, web, and Windows, or Gaia Sky for free, open-source desktop software on Windows, Linux, and macOS.

Verdict

ISS Detector is a strong choice for observers who want dependable pass timing, a pre-pass alert, and a quick weather check in one focused tool. Buy Pro if broader object tracking or amateur-radio data matters; stay with Free for occasional ISS viewing. Look elsewhere for a full planetarium experience or if Google Play’s stated inability to delete data is a deal-breaker.