---
title: Understanding App Performance metrics
description: "The App Comparison section uses three metrics to compare your selected apps: Aggregated Impression Share, Competition Status, and Portfolio Position."
---
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# Understanding App Performance metrics
The App Comparison section uses three metrics to compare your selected apps: Aggregated Impression Share, Competition Status, and Portfolio Position.
This article explains what each one shows and how it is determined.
### Aggregated Impression Share
Aggregated Impression Share shows the share of available impressions captured by an app across its top 25 keyword × storefront pairs, ranked by spend over the last 28 days.
### Which keyword × storefront pairs are included
To make sure the calculation is based on sufficient data, a keyword × storefront pair must have at least 20 days of Impression Share data within the last 28 days. A pair with fewer than 28 days of data can still be included if it has at least 20 days of data.
Pairs with fewer than 20 days of data are excluded, and the next highest-spending eligible pair is considered. If fewer than 25 eligible keyword × storefront pairs are available, only the eligible pairs are included.
The calculation uses the minimum Impression Share (All Ad Positions).
### Impression Share classifications
**Powerful:** above 70%
**Medium:** 30% to 70%
**Weak:** below 30%
A higher percentage means that you capture more of the available impressions compared with competitors.
### Competition Status
Competition Status indicates the level of competitive pressure based on the change in CPT over the last 28 days. The calculation compares the average CPT during the first 7 days with the average CPT during the last 7 days.
### Statuses
**High:** CPT increased, indicating that the auction is becoming more expensive and competitive pressure is rising.
**Low:** CPT decreased, indicating that the auction is becoming cheaper and competitive pressure is easing.
**Stable:** CPT remained unchanged.
### Portfolio Position
Portfolio Position evaluates each selected app against the average CPA and CR of the portfolio over the last 28 days.
**Top Performer:** CPA is below or equal to the portfolio average, and CR is above or equal to the portfolio average.
**Average:** Only one of CPA or CR performs above the portfolio average.
**Underperformer:** CPA is above the portfolio average, and CR is below the portfolio average.
### Related links
[How to compare apps in App Performance](https://helpcenter.mobileaction.co/en/how-to-compare-apps-in-app-performance?hsLang=en)
[Understanding App Performance recommendations](https://helpcenter.mobileaction.co/en/understanding-app-performance-recommendations?hsLang=en)
[App Performance FAQ](https://helpcenter.mobileaction.co/en/app-performance-faq?hsLang=en)
---
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