See what your viewers are attracted to in your thumbnails and get a predictive score that shows you the likelihood of someone watching your video.
Where to find the tool:
On the Video Details page of one of your videos under Thumbnail:
The tool can also be found in the Toolbox in YouTube Studio as well as the individual menu for each video on the Content Page:
Limitations - video needs to be public, private, or unlisted; if you can create an A/B test based on the two thumbnails then the video needs to be public