The gold standard in A/B testing, now expanded into content and personalization.
Optimizely built the world's most mature A/B testing platform. If rigorous experimentation is your primary need, it's hard to beat. But experimentation-first and personalization-first are different problems. AXO runs always-on behavioral personalization with a holdout group that proves lift, without requiring you to design and run individual experiments for every variant.
If your primary use case is rigorous multivariate experimentation (you have a data science team, a hypothesis backlog, and a culture of statistical rigor), Optimizely is the right choice. It was built for that job and does it better than anyone.
For always-on personalization, yes. Optimizely is the gold standard for rigorous, hypothesis-driven experimentation; AXO runs continuous behavioral personalization on 100% of traffic with a holdout that proves lift, without designing and operating individual experiments for every variant.
Optimizely is experimentation-first and expects a testing culture and often a data-science team. AXO is personalization-first: it fires automatically off visitor behavior, ships 30+ segments with no configuration, and needs no experiment design to start.
Yes. AXO holds back an always-on 10% control group and measures real incremental, order-level lift against it — statistical proof of impact without you having to author and run each experiment.