Astrophotography · iOS & Android
Sharper stars, fewer trails.
The universal astrophotography exposure calculator. Dial in the exact shutter limit before the Earth's rotation smears your stars — with a nightly sky forecast and an AR finder that points you straight to the core. Works with any DSLR, mirrorless or film camera.
The math that keeps stars as points instead of streaks — handled for you, so the only thing left to do is frame the shot.
Dark Skies does the astrophotography math, scores the night's conditions, and helps you find your target — all from your phone, even with no signal.
Enter your sensor and focal length and Dark Skies returns the exact shutter limit before the Earth's rotation starts to trail your stars — with a sharper NPF mode for when precision matters most.
A nightly forecast scores the next seven nights from 0 to 100 — folding in cloud cover, transparency, seeing and the moon — so you only pack the car when the sky is worth it.
See exactly when the Milky Way core rises, when astronomical dark begins, and how long your shooting window lasts — then point your phone at the sky and let the AR finder guide you to your target.
Your maximum trail-free shutter, in a tap.
The quick estimate for a fast setup.
The sharper calculation for pixel-level stars.
Seven nights scored 0–100 on real conditions.
Point and find the core, planets and more.
No accounts, no third-party APIs, no signal required.
No accounts. No third parties.
Dark Skies works entirely on your device — calculations and forecasts run without sign-ins or third-party APIs, and nothing about your location or your shoots is sold or sent away.
The universal astrophotography exposure calculator, sky forecast and AR finder. Free to download on the App Store and Google Play.