Many scientific datasets from satellites are in principle available for free, but that doesn’t mean that they are actually accessible to the wider public. A new web application aims to change that, at least for satellite imagery of Earth at night. An app called Radiance Light Trends allows anyone with an internet connection to quickly select a region or a site and analyse the trends in light emissions observed by satellites since 1992. The development of the web app was guided by Christopher Kyba from the GFZ German Research Centre for Geosciences in Potsdam.