From orbit.
To your sky.
Follow the ISS and Tiangong around Earth. Find the next pass, point your phone toward a satellite, and set a reminder for another look.
Coming to the App Store · Built for iPhone
ISS and Tiangong observing is free. More satellites with Pro.
Track · Find · Get reminded
Choose a satellite.
Take it from there.
Start with a complete free station experience. A short welcome guide and simple shortcuts keep the next step close.
Follow the orbit.
Explore a detailed Earth with atmosphere, clouds and city lights. Follow ground tracks and footprints, or open flight details for altitude, speed and position.
Know when to look.
Check rise, peak and set times in your local time. Overhead passes and estimated visible passes are clearly distinguished, with viewing explanations and matching countdowns.
Point toward the sky.
Sky Finder gives direction and tilt guidance, a horizon reference, and distinct past and future trails. Explore the virtual sky or turn on the optional camera overlay.
See what’s above you.
A sweeping radar shows supported satellites above your location. Pinch to zoom, choose your chart’s satellites, and open Sky Finder directly from a satellite card.
Make time to look up.
Track & notify puts satellite selection, tracking and recurring reminders together. Turn reminders on or off. Use station widgets and Live Activities on supported devices.
Keep exploring.
Search the catalog, browse launch information and groups, and explore satellites together. Discover the Sun, Moon and NOAA GloTEC ionosphere map, with adjustable opacity and labeled contours.
Camera frames are previewed only. Your saved observing places, pass calculations and reminder schedules stay on your device. Camera access is optional.
One app.
More ways to look up.
The globe, space weather and new observing tools. Open a screen for a closer look.
New P-Track 1.1 tools alongside classic globe captures. Screens show free and Pro features as labeled. Orbital positions and pass forecasts come from production data; the capture device’s location and pointing direction are simulated. Sky Finder is shown with its camera off. The catalog includes selected Starlink satellites, not the entire constellation.
Three steps.
A new perspective.
New here? Follow the optional welcome guide, skip it anytime, or replay it from Settings.
Start with ISS or Tiangong.
Choose a free station from Satellites. Turn the globe, follow its track, and open flight details when you want more.
Check the pass and find your direction.
Use Observe for forecasts and viewing conditions. Open Sky View or Sky Finder to connect the satellite’s position with your local sky.
Set a reminder for next time.
Open Track & notify and enable pass reminders at your observing spot. Return there whenever you want to turn notifications off.
Start with the stations.
Go further with Pro.
Your station companion.
A complete observing experience for the International Space Station and Tiangong.
- 3D tracking, tracks, footprints and flight details
- Pass forecasts and viewing explanations
- Sky View radar and camera-optional Sky Finder
- Basic station reminders at one editable saved place
- Station widgets and Live Activities on supported devices
- Catalog browsing, welcome guide and night tint
More satellites. Your plans.
Extend the same tracking and observing tools to supported GPS and selected Starlink satellites.
- Supported GPS and selected Starlink tracking
- Radar, Sky Finder, pass forecasts and widgets for Pro targets
- Additional saved observing places
- Custom reminder time windows
- Estimated-brightness filters for reminders
- One Pro offering, with monthly or six-month billing
Subscriptions will be offered through the App Store at launch. Both durations include the same Pro access. Prices and renewal terms are shown before purchase. Subscriptions renew automatically unless canceled in your Apple account settings. Restore Purchases is available. Disabling reminders remains available if Pro expires.
A little ground control.
When can I download P-Track?
We’re preparing P-Track for its App Store launch. This page previews the new 1.1 experience currently being tested in TestFlight; it is not yet available for public download.
What’s free, and what needs Pro?
ISS and Tiangong tracking, passes, radar and Sky Finder are free, along with basic reminders at one editable saved place and station widgets. Pro adds supported GPS and selected Starlink observing, more saved places and advanced reminder filters. Browsing satellite information is free.
Does “in view” mean visible to my eyes?
Sky View’s list uses a 5° elevation threshold. That is a geometric position test. Seeing a satellite also depends on sunlight, brightness, weather and obstructions. “Next overhead pass” can include daylight passes; “Next visible passes” applies estimated viewing conditions. Unknown brightness is labeled. GPS satellites are primarily educational, radio or telescope targets.
Does Sky Finder need the camera?
No. The virtual sky works with the camera off. You can enable the camera inside Sky Finder for an approximate overlay. Compass interference can affect pointing; the app shows direction or accuracy warnings when needed. Camera frames are previewed only.
Which time zone do pass times use?
User-facing pass times follow your phone’s local time and are labeled “local.” Technical UTC clocks are labeled “UTC.” Relative countdowns and their accompanying clocks refer to the same instant. A saved place determines the pass geometry; custom reminder windows use that place’s selected time zone.
How do reminders work?
Use Track & notify to turn recurring reminders on or off for a satellite. More options lets you review saved places and detailed rules. Schedules are calculated locally for available forecast coverage, so open P-Track regularly to extend them. iOS controls notification delivery, widget refresh and Live Activity availability.
Does P-Track include every satellite?
No. The supported catalog includes the ISS, Tiangong, GPS satellites and a selected Starlink fleet. Catalog membership and forecast coverage depend on the data source. Launch information is shown where available.
Does P-Track need internet?
Internet is needed to download fresh orbital and ionosphere data. A limited local cache can remain available during a service outage, and the app indicates stale, missing or limited coverage. Predictions and saved observing places stay on your device.
How do I restore or cancel Pro?
Choose Restore Purchases from plan selection using the Apple account that purchased Pro. Manage or cancel subscriptions in iPhone Settings under your Apple account’s Subscriptions. Deleting the app does not cancel a subscription.
Where can I get help?
Read the P-Track guide and support page, check service status, or email support@ptrackapp.com. P-Track is for education and exploration; its estimates are not for navigation or safety-critical decisions.
Your next pass starts here.
Explore the planet. Follow a station. Find your place in the sky.
P-Track for iPhone · Coming to the App Store