Install it on your phone, or just open it in your browser. Both work.
INSTALL ON YOUR PHONE
Add JetStream to your home screen. It opens full screen like any other app, no store needed.
GOOGLE PLAY
The Android app is with Google for review. It opens up as soon as that clears.
IPHONE & COMPUTER
On iPhone, open the site and tap Share, then Add to Home Screen. On a computer it runs straight in the browser. Same app, same camera.
OPEN JETSTREAMThe camera needs permission to see the sky, so allow it when your browser asks. Nothing is stored from your camera unless you choose to save a spot. You can use the map, airports and weather without an account. Sign in only if you want your logbook and cards to follow you across devices.
That is genuinely the whole idea.