The key here is that it's capable of measuring pretty much any kind of display: smartphone, tablet (any OS), TV, computer..
It also uses several techniques to give accurate results even on display implementing funky dynamic contrast, content adaptive backlight control or other similar effects.
During the process I learned a ton about color theory, maths, algorithms, colorspace conversion and representations.
..Which now gives me ideas on how to write my own automatic and high precision calibration engine!
Later maybe, but it's stuff I'm dreaming of since years actually.
Just letting you now that despite I didn't released new snapshots of the Android app, there's progress 🙂