Dark Sky Meter IYL15 app for iPhone and iPad
Get instant information about the night sky quality and contribute to science. The data provided by the app is gathered in a global map of sky darkness.
The Dark Sky Meter IYL 2015 edition app has been partially supported by the International Astronomical Union Cosmic Light Cornerstone.
Note that this app is not reliable on an iPhone 4 because of the poor camera. (4S and up are fully supported)