Thumbnail Test
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Thumbnail Test is the BEST split testing software for YouTube!
Thumbnail Test is, hands down, the best split testing tool for YouTube available right now. It not only allows you to test multiple versions of thumbnails and titles, but it also does a great job of delivering analytic insights to give you all the data you need to make an informed decision on how to not only increase your Click Through Rate, but also your Watch Time. You can manage multiple split tests on multiple channels, and the software is very easy to use. It also has a great feature that allows you to swap out variations hourly instead of just daily for very quick results. I can't recommend Thumbnail Test strongly enough. I use it every time I publish a video, and am looking forward to their new Boost feature which will automatically split test older videos in your back catalog to try to breathe new life into old videos. The developers seem committed to constantly improving the software, and I even prefer it over YouTube's internal split testing feature. It's definitely worth the monthly price in my opinion! It's a very powerful tool that can easily supercharge your success on YouTube, and if you aren't already using it, you really need to start!