AppAnnie has added new features to its free Store Stats tool that you can track apps’ performance on Google Play, iOS, Amazon, and Mac App Store apps in up to 10 countries at once.

For instance, you can see the rank history of WeChat on iOS Store in multiply countries as below. What immediately drew my attention is a peak during the past holiday season. The graph in orange is WeChat’s performance on the U.S. iOS Store. It’s unknown what marketing efforts by Tencent, WeChat’s parent company, helped it.

What’s obvious is that WeChat’s ranking began rising after Tencent added some staff in the U.S. to promote the mobile messaging app in early 2013.

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Tracey Xiang

Tracey Xiang is Beijing, China-based tech writer. Reach her at traceyxiang@gmail.com