What are the best tools for A/B Testing according to you guys?
There are plenty such as Google Analytics Experiments, Kissmetrics, A/Bingo.
Check out this article.
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A/B testing (sometimes called split testing) is comparing two versions of a web page to see which one performs better. You compare two web pages by showing the two variants (let's call them A and B) to similar visitors at the same time.
VWO. ...
Five Second Test. ...
Google Analytics Experiments. ...
Convert Experiment. ...
Maxymiser. ...
Google Analytics Experiments and Kissmetrics are really good options.