SkyFix
Read the sky. Find your way.
A live sky you hold up to the real one, a course in celestial navigation, and a voyage under sail to learn it on. For iPhone and iPad.
Coming to the App Store on 18 December 2026. Pre-order opens soon. $9.99 at launch, $19.99 from 1 January 2027 (US prices). One purchase: no subscription, no in-app purchases, no ads.
Three ways in
SkyFix opens on a painted title screen. One tap takes you to the sky, to the lessons or to the navigation tools.
Look up
Hold your phone to the sky and see what is there: the Moon, the planets, thousands of stars and their constellations, the Space Station's passes and the next rocket launches. Every position is worked out on your device.
Lessons
A five-level course in celestial navigation, from finding Polaris to a fix from three stars. Every number in it comes from the app's own astronomy engine, not typed in by hand.
Find your way
Take a sight with your phone, or enter one from a real sextant, and work it into a line of position and a fix. SkyFix always says how accurate the answer is.
The voyage
Sail a Royal Navy sloop around 1790 as her youngest midshipman. The story is told in 23 narrated films, and eight times it stops for you to do the navigation yourself.
When the sky is clear you take the sight under the real one. When it is not, the engine draws the sky for you and says so: a drawn star is never passed off as one you saw.
Good to know
- Night modeEverything turns deep red, the camera picture included, so your eyes stay used to the dark.
- No account, no trackingNo sign-in, no analytics and no advertising. Your sights and progress stay on your device. Privacy policy.
- Works offlineThe stars, planets and Moon need no signal. Space Station passes and launches refresh when you have one.
- A training instrumentSkyFix teaches real celestial navigation for recreation and education. It is not for primary navigation: carry proper charts and instruments when it matters.