Convert Experiences (previously Convert Experiments) is, in my opinion, the best A/B testing software on the market right now. It is my go-to recommendation for any A/B testing requirement.
First off, the support is top-notch. It is easy to get hold of the founder/SEO Dennis and if you run into any significant trouble, it's easy to get hold of the senior developers.
We are advanced A/B testers and Convert is the only piece of software that has these critical features that I have not been able to find anywhere else. I will touch on those elements that are more unique to Convert.
2. Advanced editing. Unlike a lot of their competitors, Convert allows you to edit the variation code directly. This means that you can basically test any website (including AJAX and highly dynamic sites). This is not the case with some other competitors.
3. Easy breakdown and visualization of daily conversion patterns. Surprisingly, this is not available with a lot of A/B testing platforms. We want to see the conversion rate daily so that we can see if there are any validity threats in the test. Most platforms only provide an aggregate of data up to that day.
I strongly recommend Convert Experiences.