When can I see the ISS? What's that light in the sky? The official Heavens-Above app provides you with precise pass predictions for the ISS visible satellites Iridium flares and radio satellites. Main features include:


No advertisements
This version is free of advertisements. You can try the free version before buying this one.

Live sky chart
See what's in the sky above you right now or at a given moment.

Pass predictions
Get precise predictions for passes of the ISS and most visible satellites.

Iridium flares
See when Iridium satellites mirror the sunlight directly towards you resulting in bright flares.

Radio satellites
Get passes for amateur radio satellites complete with uplink and downlink information.

All calculations performed locally
Predictions are generated right on your phone so you only need a data connection every few days.

Orbit and ground track
See details about the orbit of any selected satellite rendered and with all relevant data.

Satellite details
Get detailed information about any satellite as provided by our Heavens-Above website.

Timeline
Get a visual overview over passes and animate the position of satellites on the sky chart and on the ground track.

Night mode
An optional red on black color scheme to preserve your night vision.

Tracker
Easily find or identify any object in the sky by orienting your device towards it.

Calendar Integration
Quickly add interesting passes to your calendar so you won't miss them.