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Viewable Impressions

“Viewable impressions” indicate the number of times your ads appear in the users' visible area.
Clicks that occur after a viewable impression are called “viewable clicks”.
You can use viewable impression-related metrics to analyze whether your ad is "seen but not clicked" or "not seen and not clicked".
 
  • Shown in the visible area refers to more than 50% of the ad is continuously shown for one second or more.
  • Viewable impressions may not be available depending on ad space.
  • Ads that appear in the visible area of internet users more than an hour after delivery are not counted as viewable impressions.
  • Viewable impressions are measured in real time, but there may be a time lag of a few seconds depending on your environment and network conditions. Therefore, if your ad is clicked after it's displayed and before it counts as a viewable impression, it won't count as a viewable click. For these reasons, there may be a difference between viewable clicks and clicks.
  • We have changed the counting method for ad impressions and CTR from server-side to client-side on August 1, 2019. Use the counting indexes named with “(previous)” when you check the value of server-side counting.

Viewable impressions data items

* Indicators with (previous) in the name are available on YDN only.

Data item Description
Measured impressions (previous) Number of impressions which can measure viewable impressions
*Data item name changed from “Impressions on the measurement object” on August 1, 2019.
Viewable impressions The number of times the ad shows as viewable for internet users.
Viewable impression rate (previous) The ratio of the Viewable impressions to measured impressions (previous). You can check how much you have seen the delivered advertisement.
*Data item name changed from “Viewable impression rate” on August 1, 2019.
Viewable clicks (previous) The number of times the ad has been clicked to the measured impressions (previous).
*Data item name changed from “Viewable clicks” on August 1, 2019.
Viewable CTR (previous) The previous ratio of the number of times the ad has been clicked to the Viewable Impressions. You can see how many clicks were made on the ad that internet users saw.
*Data item name changed from “Viewable click rate” on August 1, 2019.
Measured impressions Number of impressions which can measure viewable impressions.
Measured impression rate Measurement rate of measured impressions to impressions.
Viewable impression rate Number of impression rate which can measure viewable impressions
Viewable clicks The number of times the ad has been clicked to the total viewable impressions.
Viewable CTR The number of times the ad has been clicked to the total viewable impressions.
Reaches The number of unique users that have one or more viewable impressions during the specified period.
*The data after September 17, 2019 is available.
Average frequency

The average number of viewable impressions per unique user
*The data after September 17, 2019 is available.

 

The following figure describes the relationship of "Impressions", "measured impressions", "viewable impressions", "clicks" and "viewable clicks".
*The size of the circle in the figure does not represent the actual ratio of each index.

The performance data and performance report are available in the list on the page for each value related to viewable impressions.

Items that are not displayed in the list by default should be added by “Edit items displayed”.

Learn more how to add items displayed of YDN on the following page.
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Learn more how to add items displayed of Display Ads (Auction) on the following page.
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