I'd like to talk a little bit about a common misconception. Red call to action buttons do not in and of themselves increase conversions. There isn't anything magical about red call-to-action buttons. Red CTA buttons only work to increase conversions if they are the only red item on the page.
I have seen quite a number of websites lately, a few of them belonging to members of the CRO Junkies Facebook group, that are misusing this conversion rate optimization
technique. You want your call-to-action button to be a different color than anything else on the page. That could mean a green button or a yellow button or an orange button or even a black button.
The reason this technique works is because of something called Gestalt psychology. In the image below, what do you see first? You see the red Jellybean. It pops out and draws your eyes to it.
It's also worth mentioning that colors can be successfully employed in a wide variety of other techniques to help control user eye paths. For better conversions, stick to a single purpose for each page. Pages with multiple calls to action get far fewer conversions for each action. And the split is not even.
You would think that if you have a page with 5 different calls to action, that the conversions would be split 5 ways. This is absolutely not the case. When you present many different types of CTAs, it causes confusion and users are likely to not convert for anything.