📱 CPI (Cost Per Install)
Quick Summary
CPI is the metric measuring the average cost that a publisher must spend on marketing campaigns to acquire one successful game install from a user. The lower the CPI, the more efficient the marketing campaign.
Cost Per Install is one of the most critical key performance indicators (KPI) in the Mobile Game industry and Freemium/Free-to-Play software business models.
In the User Acquisition (UA) ecosystem, CPI is calculated based on the total budget allocated to digital advertising platforms (such as Facebook Ads, Google Ads, TikTok) divided by the total actual number of users who clicked the ad and completed the app installation.
This is a direct measure reflecting the attractiveness of the product to the mass market (Market Appeal). A low CPI signals that the ad creative and communication message are performing extremely effectively. Conversely, a high CPI indicates too much barrier cost, requiring the developer to re-optimize their advertising strategy or improve product quality.
1. Mathematical Formula
Practical example: If a publisher spends 4 per install**.
2. The Commercial Risk Balance (CPI vs LTV)
The greatest survival challenge for Mobile Game developers is optimizing the balance between CPI (cost of acquiring new users) and LTV (Customer Lifetime Value — average revenue generated per user).
The immutable law of game publishing: LTV must always be greater than CPI (combined with server maintenance costs). If the cost to acquire one user (CPI) is 2 in revenue (LTV) before uninstalling, the project will lose money.
- User Acquisition (UA) specialists are responsible for continuously A/B testing ad video variants to find the target audience with the most optimal CPI.
- While traditional AAA game genres rarely depend on this metric, Hyper-Casual games depend on it for survival, requiring CPI to be maintained at extremely low levels (just a few cents per install).