What is the percentage of web users that use either cookie blocking software for their web browsers or software that blocks Google Analytics tracking?
None of those blocking tools report [expose] themselves to trend trackers so you gotta count the extension market users. Example, the Google analytics opt-out extension in the play store has 295,842 users out of the billions that use the internet. Thats like nothing in the scope of internet users. And thats just Google analytics block, not all cookies block.
As far as the rest of cookies, they are generally useful and far less people want to block them for obvious reasons: they don't want to lose their cart, they want to stay signed in across apps, they just want a hassle-free experience from a site that has memory of them.
That being said, I would guess at most something less than .001% of web users block all cookies. Thats 1 million folks per billion users.
Yell.com are either blocking cookies or running in "incognito" mode (which accepts cookies but discards them later, which I think would count here):
How about local storage?
97.6% of users have local storage enabled (0.07% of those are non-JS users) I was prepared for the number of users without local storage enable to be slightly higher than the two previous measures, but 2.4% is quite a lot, this translates to around 480,000 visitors. That’s not an alarming amount, but it’s high enough that we can’t ignore it. Of those users, 0.07% don’t allow JS.
Many of these remaining visitors choose to use their browser’s Private Browsing mode, which causes data to [not] be stored on their machines. iOS Safari is particularly notable for this behaviour. We found that these users know what they are doing and consciously want to prevent tracking and in doing so can stop some features from working.