Source: InMobi [download page]
Notes: Based on Q3 network data, InMobi has determined that for app advertisers, the cost per install (CPI) is significantly higher on iOS than Android devices, with this true across all markets studied with the exception of China and France. Across the various markets studied, France emerges as having the highest CPI, with installs costing advertisers more than twice the global average. App installs in the US, meanwhile, cost advertisers 34% more than the global average.
Related: When Are Mobile Owners Using Apps?