|https://crossbrowsertesting.com/automated-screenshot||1. Compares images using a DOM comparison rather than a pure image comparison. You get much more info about the differences between the snapshots.|
2. You can compare 2 website URLS or 2 versions of the same website.
3. No coding required for historical image comparison. Although, for 2 websites comparison you still need to write some code.
|1. There are many-many false positives after comparison. You need to manually check which one are relevant.|
|http://bbc-news.github.io/wraith/||1. Free tool for image capture and comparison.||1. Doesn’t support multiple devices.|
2. Coding is required.