Google Play Store data suggests that just over 1 million Pixel, Pixel XL handsets have been sold22
For some time, Google listed 500,000 to 1,000,000 installations of the Pixel Launcher. That figure has just changed to a range between 1 to 5 million installations of the app. This has taken place seven months after the Pixel and Pixel XL were released. The launcher is an app offered exclusively to owners of the two Pixel handsets. As a result, tracking the number of times it has been installed can give us a reasonable estimate of the number of Pixel units purchased. And at this moment, that would appear to add up to approximately one million phones.
To put this number in perspective, Samsung reportedly sold 5 million Galaxy S8 and Galaxy S8+ handsets after just 26 days. While it took 37 days in South Korea for the pair to sell one million units in that country, it took twice as many days for the Galaxy S7 and Galaxy S7 edge to hit the million sales mark last year. The LG G6 will have sold 2 million units in six months according to one estimate. While the Pixel wouldn't rank among the top selling Android models, there is enough support within Google to continue producing the line with sequels planned for this year.
We should point out that the install numbers in the Google Play Store count as one install per account even if you've uninstalled and re-installed the app a number of times.
source: ArsTechnica via AndroidAuthority