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Cost Per Action (CPA) definition

Cost Per Action (CPA)

CPA is the amount spent to drive a specific user action (e.g., a subscription, sign-up, or in-app purchase). It’s commonly used in performance-based advertising models.

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More terms of Metrics

App Crashes mobile-advertising-glossary-metrics

The rate at which an app unexpectedly closes during user sessions. Expressed as (Crashes ÷ Sessions) × 100%. High crash rates degrade UX and negatively impact app ratings.

Metrics

Install Rate (IR) mobile-advertising-glossary-metrics

The percentage of users who clicked on an ad and went on to install the app. It helps advertisers evaluate how compelling their app offering is post-click.

Metrics

Cost Per Install (CPI) mobile-advertising-glossary-metrics

CPI measures the cost to acquire a single app install: CPI = Total Spend / Number of Installs. It’s a standard KPI for user acquisition campaigns in the mobile app ecosystem.

Metrics

Ad Fill Rate mobile-advertising-glossary-metrics

The percentage of ad requests that are successfully filled with an ad impression: Fill Rate = (Filled Requests / Total Requests) * 100. Low fill rates may suggest weak demand or misconfiguration.

Metrics

Install mobile-advertising-glossary-metrics

In mobile advertising, an install refers specifically to when a user downloads and successfully installs an app on their device, often following an ad interaction.

Metrics

DAU/MAU Ratio mobile-advertising-glossary-metrics

This metric indicates user stickiness or loyalty. A DAU/MAU ratio closer to 1 means users return frequently throughout the month.

Metrics

Unique Reach mobile-advertising-glossary-metrics

The number of unique users (or devices/households) exposed to an ad at least once. Useful for understanding total unduplicated audience.

Metrics

Bid Rate mobile-advertising-glossary-metrics

In programmatic advertising, this is the proportion of total ad requests for which a DSP submits a bid. A low bid rate might indicate strict targeting or bidding filters.

Metrics
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