Mathematical Formula

CPI = Total Ad Spend on Install Campaign / Number of Successful Installs

What is CPI?

CPI is a standard app-marketing pricing metric used in campaigns where the primary goal is getting a user to download and open a mobile or desktop app.

Where is CPI Used?

Mobile ad campaigns (Meta, App Store Ads, Google UAC, AdMob) aiming to drive app store downloads.

What Does It Mean & Strategic Value

Measures mobile acquisition efficiency. A rising CPI indicates ad creative fatigue, high friction in app store listings, or poor targeting choices.

Down-Funnel Impact

High CPI translates to costly user-bases. If CPI is high, you must optimize app store screenshots and review ratings.

Real-World Usage & Auditing

Used by app growth marketers to allocate programmatic budgets across devices and target regions.

Why CPI Matters for Growth

Key benchmark in early-stage mobile startup growth before in-app purchases are fully monetized.

Operational Example Scenario

If a gaming app invests $10,000 on Meta App Installs and receives 4,000 completed installation triggers on iPhones, the CPI is $2.50.