Stars Above Horizon.
The cellphone app is downloadable from AppStore and GooglePlay for Android and iOS, respectively.
Your task as user:
open the app
[automatically, it loads some data from local weather stations]
open the star chart
type on the stars that you can see
if you see a star coloured (reddish, yellowish, bluish) type longer
a menu will open and you can report the colour, too
once you are done: SAFE the data
(it will be uploaded to a server at the University of Jena, Germany)
At Friedrich Schiller University, the cellphone app for monitoring atmospherical conditions by the observations of stars was developed. The development started with a prototyp for feasibility tests in 2018/9 by a student of physics. It was developed further by two software development projects by (in total) five students of computer science.