Cosmik is a free, no-login web app that tracks the ISS, Starlink and over 20,000 satellites live in 3D, shows the real-time rocket launch schedule, and sends alerts so you know exactly when to look up. It runs entirely in your browser.

Yes. Cosmik is completely free with no login required. Optional push and email alerts are also free; the project is supported by donations.

How do I track the ISS with Cosmik?

Open Cosmik, search for the ISS (or any satellite), and follow it. Cosmik computes the next visible pass over your location and can send a push or email alert a few minutes before it flies over so you can step outside and watch.

Does Cosmik track rocket launches?

Yes. Cosmik shows the live upcoming launch schedule with countdowns, status, and embedded webcasts, and can alert you before liftoff for launches you follow.

How accurate is Cosmik's satellite tracking?

Cosmik propagates official CelesTrak orbital data (TLEs) with the SGP4 model in your browser — the same physics professional trackers use — for accurate real-time positions and pass predictions.

How to track satellites live — free, in your browser

Over 20,000 tracked objects orbit Earth right now — space stations, internet constellations, weather satellites, telescopes, and rocket debris. Here's how live tracking works and how to see it all yourself in 3D, free: open the live map →

How satellite tracking works

Radars and telescopes (led by the US Space Force) measure every object's orbit and publish it as TLEs (two-line element sets) via services like CelesTrak. From a fresh TLE, the SGP4 algorithm predicts a satellite's exact position minutes or days ahead — that's what Cosmik computes live in your browser for the whole catalogue, no server needed.

Track satellites in 4 steps

1. Open gocosmik.com — the 3D map runs in any modern browser, mobile included.
2. Zoom to Earth — every satellite appears in its true position, updated continuously. Filter Starlink, GPS, weather satellites and more.
3. Switch to the sky view with your location on — see exactly what's crossing your sky right now, and when the next pass comes.
4. Follow anything with ★ — free push or email alerts before it flies over, plus launch and reentry notifications.

What to track first

The ISS — the brightest artificial object in the sky. See pass times for your city.
A fresh Starlink train — the famous line of lights after each SpaceX launch.
Hubble and Tiangong — icons you can watch cross the sky.
Whatever just launched — follow the launch news and watch new satellites deploy in 3D.