Each user-submitted test on ABtests gives you some insight into what has worked and what hasn’t worked for other designers, and what they’ve learned from their testing.

In this example, TogetherTag tested two different home pages, one with the main call to action (a request for the user’s pet’s name) on the right, and one with the same CTA on the left.

CTA on right

CTA on left

TogetherTag claims that moving the CTA to the left increased sign-ups by 20.3%, saying “the left side of the page is read first and has a higher priority than the right. Putting the call to action in the prime spot increased conversions.”

While a lot of what you’ll see here may seem like common sense after reading usability books, ABtests may be a good reference for real-life data points when discussing design with clients.