SkyQI is a free citizen-science platform for monitoring light pollution. Photograph the night sky with any smartphone and get an instant Sky Quality Meter (SQM) estimate and Bortle scale class (1–9). Every reading joins a global map built from community measurements and VIIRS satellite data.
Get the free SkyQI app: SkyQI - Light Pollution on the App Store (iOS) · SkyQI - Light Pollution Monitor on Google Play (Android)