Just to be clear, VWO wasn't and isn't a follower. We started in late 2009, exactly the same time when Optimizely started and we had visual editor on day 1 and

Just to be clear, VWO wasn't and isn't a follower. We started in late 2009, exactly the same time when Optimizely started and we had visual editor on day 1 and have many firsts in the market to our credit (integrating heatmaps into A/B tests, asynchronous code, Bayesian statistics and so on). It's a perception among VC/SF crowd that Optimizely was the only innovator in the A/B testing market but that's not the truth if you actually put effort into researching. Many players, including VWO and of course Optimizely too, pushed the market in terms of innovation. -Paras (founder of VWO)