AdDuplex has released its latest monthly report on the state of the Windows 10 ecosystem, showing that the April 2018 Update is now on 84.2 percent of Windows 10 PCs. And though the April 2018 Update continues to enjoy the fastest rollout of any major Windows 10 feature update, its growth has started to slow compared to previous months.

In comparison, the April 2018 Update was at 78 percent coverage when AdDuplex released its last monthly report. In May, the update had hit 50 percent coverage, reaching that point in half the time it took the Fall Creators Update to do the same.

In terms of past feature updates, their share continues to drop. According to AdDuplex's numbers, the Fall Creators Update is now on 10.3 percent of Windows 10 PCs, while the Creators Update and Anniversary Update are at 2.1 percent and 2.2 percent, respectively.

Microsoft confirmed in June that the April 2018 Update had reached full availability, so it makes sense that we'd see its coverage accelerate. Still, it's worth noting that there's a disparity between AdDuplex's numbers and the most recent figures provided by Microsoft. In announcing full availability of the latest update, Microsoft revealed it was installed on 250 million devices out of Windows 10's total install base of around 700 million.

The gulf is likely explained by AdDuplex's method for sampling data for its reports. The company collects its figures based on a collection of around 5,000 Microsoft Store apps that run its SDK, which could slant results based on a number of factors. For July, AdDuplex says that its data was collected throughout the day of July 25.