A week after its release, Apple’s OS X Yosemite powered 13% of all Macs in the U.S. and Canada, about the same uptake pace as seen by its predecessor, Mavericks.

Yosemite debuted Oct. 16.

Seven days later, Yosemite’s share of all Macs in North America stood at 12.8%, ad network Chitika said today. Chitika frequently mines its logs for evidence of the operating systems or browsers used by the devices that access partners’ online advertisements.

In its first week of its availability, Mavericks’ uptake was almost the same: 12.4%.

Both Yosemite and Mavericks were grabbed by a larger percentage of Mac owners than 2012’s OS X Mountain Lion, which after seven days accounted for only 5.6% of all systems. The difference between Yosemite and Mavericks on one hand, and Mountain Lion on the other, has been credited to the formers’ zero-dollar pricing. Mavericks was Apple’s first free OS upgrade, and Yosemite followed suit; Mountain Lion cost $19.99.

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