Conversion rate optimization is a stack, not a single tool. The teams that move conversion meaningfully use 3-5 tools that each handle a specific job: diagnosing leaks, observing visitor behavior, testing changes, and personalizing experiences. Trying to do all of it in one platform usually means doing each one badly.
We tested 14 tools across the four main CRO jobs in early 2026. Nine made the cut. The right stack depends on your traffic, team size, and goals — but the categories are stable. Pick one tool from each category that fits your stage, not 14 tools because someone said you should.