Apple's App Store is the market leader, according to an ABI Research index that considers criteria beyond simply sales numbers, including implementation and innovation. Apple scored 80.8 on a scale of 100 in combined score, besting Android's 72.2 and Microsoft's 63.9, which nonetheless topped Apple in the innovation category. ABI favored Microsoft's method of app charting, and "the way Microsoft has been transparent about what its chart algorithm has eaten, if compared to Apple and Google, which officially never comment anything and leave everything for speculation," ABI analyst Aapo Markkanen says.

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