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A funnel is any sequence of steps you want users to complete - sign up, verify email, complete onboarding, reach core feature, convert to paid. Funnel analysis measures how many users make it through each step and, more importantly, where they don’t 🔍

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How it works

You define the steps, instrument them, and measure conversion between each. The output is a visualisation showing the percentage of users who proceed from step one to step two, two to three, and so on. The drop-off between steps is where the work is. A 60% drop between “sign up” and “verify email” tells you something very specific and fixable. A 40% drop between “first session” and “second session” tells you something more fundamental about activation.

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What funnel analysis is good for

Finding the biggest leak - funnels make it obvious where to focus. The step with the worst conversion is almost always the highest-leverage place to improve. No need to guess 💡 Measuring the impact of changes - run a funnel before and after an onboarding redesign, and you have a clear before/after comparison. Much more useful than overall engagement metrics that blend many different user cohorts. Segmenting drop-off - good funnel tools let you break down drop-off by segment. Do mobile users drop off at the same point as desktop users? Do users from paid acquisition convert differently than organic? Segmentation turns a where into a who, which often reveals the why.

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The limits of funnel analysis

Funnels show you where users drop off but not why. A 70% drop-off at step three is a clear signal that something is wrong. Whether that’s a confusing UI, a technical bug, a mismatch between what users expected and what they found, or something else entirely - funnel analysis can’t tell you. That’s where qualitative methods come in. Session recordings, heatmaps, and usability testing are the follow-up to funnel analysis, not an alternative to it 🙌

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Tools

Amplitude, Mixpanel, and Heap all do funnel analysis well. Google Analytics 4 has it built in. The tool matters less than the instrumentation - funnels are only as useful as the events you track. Lesson learned: the most valuable funnel I ever built wasn’t the acquisition funnel - it was the activation funnel. Understanding exactly which steps correlated with retention changed what the team prioritised for the next six months.