SkyFlux
Where the sky is still dark
Drag to move, scroll or pinch to zoom. The number under the crosshair is how dark the sky is at that exact spot, on a scale of 1 to 9.
What you are looking at
The glow is light thrown upward into the sky, measured from orbit — not streetlights seen from above, but the haze they put into the air that hides the stars. A 1 is a sky where the Milky Way casts a shadow. A 9 is a city centre, where only the brightest stars survive. Most of Europe sits between 4 and 7, and the useful question is never “is it dark here” but “how far do I have to drive”.
The same map, in your pocket
SkyFlux carries this layer inside the app, so it works in a field with no signal — and it adds the part a map cannot do: what is actually up tonight, when it gets dark where you stand, and whether the clouds will let you see any of it.
Light pollution layer derived by SkyFlux from NASA Black Marble (VIIRS/Suomi NPP, public domain), method after Duriscoe et al. (2018). Coastlines: Natural Earth (public domain). This is not the Bortle scale — it is a modelled figure from satellite radiance, not a naked-eye judgement.