Facts checked November 2026. Follow the Sources links for current details.
What happened to Intellimize
Intellimize built a platform that used machine learning to personalize and optimize website experiences for each visitor, popular with B2B and SaaS marketing teams. In April 2024, Webflow announced it had acquired Intellimize as part of a plan to combine site building with personalization and experimentation.
In October 2024 Webflow introduced its Website Experience Platform and Webflow Optimize, described as Webflow's native optimization product with AI-powered A/B testing and personalization. Webflow said Optimize was built into its platform and also available as a standalone tool.
So when people compare against "Intellimize" today, the practical comparison is usually Webflow Optimize.
What ABFinal is
ABFinal is a free toolkit for planning and analyzing A/B tests: sample size, duration, MDE, SRM, significance with a Bayesian probability, price tests and an A/A simulator. It doesn't run tests or personalize pages.
Side by side
| Intellimize / Webflow Optimize | ABFinal | |
|---|---|---|
| Runs tests and personalization | Yes | No |
| AI-driven traffic allocation | Yes | No; classical statistics only |
| Best fit | Webflow sites, marketing teams with substantial traffic | Anyone planning or analyzing tests |
| Transparency of the math | Vendor-managed models | Formulas published, results reproducible |
| Price | Vendor pricing | Free |
The question to ask about AI optimization
How is lift measured? An adaptive system that keeps shifting traffic toward winners can look great on its own dashboard. The convincing evidence is a holdout: a share of visitors who always get the default experience, compared against everyone else over the same period. When a vendor reports a holdout comparison, you can check the conversion counts in our significance calculator.
Our AI in A/B testing guide covers bandits, personalization and their trade-offs in more detail.
Common questions
Does Intellimize still exist?
Intellimize was acquired by Webflow, announced in April 2024. In October 2024 Webflow launched Webflow Optimize, its native optimization product with AI-powered A/B testing and personalization, built on that acquisition. For current availability of the original Intellimize product, check with Webflow.
Do I need a Webflow site to use Webflow Optimize?
Webflow Optimize is built into the Webflow platform. Webflow's October 2024 announcement also said it was available as a standalone tool. Confirm current options and pricing with Webflow.
How is AI optimization different from a classic A/B test?
AI optimization adjusts which experience each visitor sees as data comes in, often by audience segment, aiming to earn more during the test. A classic A/B test keeps a fixed split to measure the effect precisely. AI optimization needs a holdout group to prove its value.