I have published a very popular series of posts discussing the evolution of user adoption for iOS releases. These have looked at individual iOS releases and tracked the progress of the release.
This approach has always felt a bit cumbersome to me since I end up with dozens of small updates all containing the same type of information. To mitigate that I’ve decided to launch a single site with this data. Going forward I will maintain an up-to-date dashboard showing current iOS adoption stats here:
While I may from time to time still have posts showing interesting details of this landscape, this link should be the canonical place to check current data.