Thumbnail Test
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I'm Glad I Found This Tool
I've struggled to find a A/B title and thumbnail tester that does what I want it to, until I found Thumbnail Test which I have read great reviews on. I've decided I'm going to use it even when I get access to YouTube's test and compare feature, because YouTubes version only shows results using watch time, which in my opinion isn't great, I think thumbnails and titles should be assessed using click-through rate. Which is why I decided to use Thumbnail Test because of the huge range of analytics it provides.