Cost Per Install (CPI) is a metric used in mobile app marketing to measure the average price an advertiser pays for each installation or download of their mobile application. CPI is a key performance indicator (KPI) for app developers and marketers as it helps them understand the efficiency and effectiveness of their app promotion campaigns because it directly relates to user acquisition costs.

To calculate the Cost Per Install, you divide the total advertising cost by the number of app installations during a specific period:

Cost Per Install = Total Advertising Cost / Number of App Installations

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Cost Per Conversion




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