The original cyanometer was invented by the Genevan physicist and Alpine explorer Horace-Bénédict de Saussure (* 17 February 1740 in Conches; † 22 January 1799) in 1789. It is an instrument for measuring 'blueness', specifically the colour intensity of blue sky. With the measurement it is possible to draw conclusions from the constitution of the atmosphere: the bluer the sky the less the water vapor. Saussures cyanometer consisted out of 53 parts of a circular ring ranging from white over different grades of blue to black (Saussure used Prussian blue). Saussure used his cyanometer for measurements in Geneva, Chamonix und on the Mont Blanc.
Alexander von Humboldt used a cyanometer on his expedition to America (1799 - 1804).
You can use our Cyanometer in three modes: The modern scale uses distinct grades of blue starting with clear white up to black. The Saussure scale shall give an idea about the colors from Saussures original cyanometer. With the user defined scale own scans of blue skies can be added to an own colored circular ring - an own cyanometer.
Each scan is saved inside the app containing information about date, time and locality. So it is possible to compare scans of blue skies from different locations.
Privacy notice: No data will be saved or processed outside the app.
Fixes for iOS13/SDK 13.
Ratings and ReviewsSee All
My sky, your sky
I love this app.
Since reading about Humboldt’s Cyanometer in “The Invention of Nature” I’ve been a bit obsessed with the idea of measuring the blueness of the sky. I understand the blueness can be a measure of water content, but there is something also poetic and uniting about the cyanometer: we all share the same sky, yet it is for each of us a different sky.
Use this app and your sky will never be simply blue again.
With Family Sharing set up, up to six family members can use this app.