To get percentage of similarity of two images use the following request with parameters:

src	url to a first image
dst	url to a second image
for example:	http://qr.unsode.com/imagecomparer.aspx?src=http%3a%2f%2fqr.unsode.com%2fimage1.jpg&dst=http%3a%2f%2fqr.unsode.com%2fimage2.jpg

Also, you may pass these parameters as GET/POST parameters

In response you will get the "similarity-percentage" Http Header with the percentage of similarity, as well as http response body with the same decimal percentage value.

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