To avoid confusion with the two terms Visibility and viewability and related discrepancies between the numbers, here are the two concepts and what's behind even be explained.
translated quite formal, it is for the two terms to similar but not identical terms:
Visibility = Visibility (at some point) as a percentage
viewability = view option as Yes / No (Ability for a View = possibility of a view)
Usually, the visibility is so interpreted so that it indicates what percentage of an advertisement were at load time in the immediately visible range. The viewability specifies, however, whether it may have been the visitor at all theoretically possible to see the banners (perceive it). This may also be the case with banners, are not in the immediately visible area - such as when the banner is on the page and the user scrolls back down to the footer. Appeared the banner in the view of the user, he is considered visible (viewability = yes). For better representation, the viewability rate is expressed as a percentage to be:
Viewability rate of a billboard in% = ( "number of overlays the viewability = yes had" / "number of screenings total") * 100
For advertisers and publishers, the question whether an advertisement is visible often a different meaning:
- A publisher will say is visible when at least one pixel in the browser box appears
- An advertiser will say is only visible when at least x% of the banner for y seconds in the browser field were
For the measurement of campaign success (from Advertiser view) therefore controlling the so-called "50/1" method has become established here to take. 50/1 means an overlay is always counted as shown when the advertisement is published at least 50% of its pixels for at least 1 second in the browser field.
Visibility vs viewability in AdSpirit
AdSpirit measures in his report, the visibility, so the percentage of how many pixels of advertising space at load time were visible. This value down and the visibility targeting can be used and corresponding reports are drawn. This has the simple reason that the ad server already has to decide when loading the website whether / which banner displaying. Whether a banner is still visible later, the ad server can not know and therefore not target it.
Unless the visibility of numbers AdSpirit with viewability numbers of other tools are compared, so it must be noted that this is about other measurement methods. Nevertheless, are usually these two values in% but strongly depend Visibility in% and viewability together: A web page where all banners are at bottom of page, a Visibility will have in many requests to appear with 0% or lower visibility. At the same time, this website will also have a very low viewability rate because few visitors actually scroll down until the end of page.