Cost per install measures acquisition efficiency at the point an app is downloaded, but it does not prove that the user is genuine, activated or retained. CPI decisions need post-install evidence.
Define a valid install
Agree attribution windows, reinstall rules, device requirements and fraud controls. Different partners may count events differently unless the commercial definition is explicit.
Optimise the store experience
Creative promises, screenshots, ratings, descriptions and app size affect the conversion from click to install. Media efficiency cannot fully compensate for a weak or misleading listing.
Track the first meaningful events
Identify onboarding completion, registration, trial, transaction or another activation signal. Compare sources by the percentage and cost of users reaching that stage.
Review cohorts over time
Retention and value may differ materially after seven, thirty or ninety days. A higher CPI source can be more valuable if acquired users remain active and generate sustainable revenue.
- Clear install and fraud definitions
- Post-install events connected to attribution
- Cohort quality compared by source
Frequently asked questions
What is a good CPI?
It depends on market, platform, category and expected user value. CPI should be judged with activation and retention.
Why do installs differ between platforms and analytics?
Attribution windows, privacy rules, reinstall logic and time zones can create differences that need documented reconciliation.
Connect CPI with the first valuable in-app event
Validate attribution and fraud controls before scale, then compare acquisition cohorts by onboarding completion, activation and retention. Let those outcomes—not install price alone—inform creative, audience and bid decisions.