App Store Connect metric
App Store impressions
Apple's definition of impressions and unique device impressions, what they include, and how to use them.
Definition
The number of times your app was viewed on the Today, Games, Apps and Search tabs of the App Store for more than one second. Includes product page views. Impressions (Unique Devices) counts each device once.
Where to find it
App Store Connect › Analytics › Acquisition
The common mistake
An impression isn't interest. Scrolling past your app in search results counts. Featuring, ads and repeated searches can all inflate impressions without anyone considering the app.
What to use it for
Spotting changes in visibility, and comparing sources. If impressions fall in App Store Search but not Browse, look at rankings; if Browse falls, featuring probably ended.