How to A.B. Test Before Choosing a Thumbnail

The best tool I use is TubeBuddy. You can get human feedback and people kind of rate the thumbnails and rank them for you. What's popular on YouTube is not what's going to be popular with people in their 30s and 40s. People judge all YouTube advice, all YouTube help videos, and even their own content versus entertainers. It doesn't matter. The only thing they have in common is the same platform.