At a glance
Biggest Funnel Step Drop-off is a funnels metric tracked from PostHog data. It pinpoints the single step in your primary funnel where the most users abandon, expressed as the drop-off percentage between two consecutive steps. Where Primary Funnel Conversion tells you the funnel is leaking, this card tells you exactly where. It turns a vague “conversion is down” into a specific “the cart-to-checkout step is losing 62% of users”.
| What it counts | The funnel step with the largest drop-off, and the percentage of users lost at that step. |
| Sample type | Backend API data from PostHog funnel insights, refreshed on the standard data refresh. |
| Why it matters | The biggest leak is usually the highest-leverage fix. Naming the worst step turns funnel analysis into a clear next action. |
| Reading the value | The card names the step and its drop percentage. A step losing more than 40% is flagged as a priority. |
| Currency | percent |
| Time window | 30D |
| Alert trigger | any step >40% drop |
| Sentiment key | ph_funnel_dropoff |
| Roles | owner, marketing |
Calculation
Calculated automatically from your PostHog data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading.Worked example
A representative reading of Biggest Funnel Step Drop-off for a typical merchant on PostHog. Suppose your funnel converts 100% to product view, 46% to add to cart, then only 14% to purchase. The largest single drop is add to cart to purchase, losing about 70% of carts. The card names that step. After a guest-checkout change on 27 Mar 26, if the worst step shifts to product view to add to cart, you know the friction moved earlier. Cross-reference Primary Funnel Conversion for the overall rate and Avg Time to Convert for hesitation signals. For deeper investigation, use Vortex Mind to trace upstream causes; for natural-language exploration, ask Ask Viq.Sibling cards merchants should reference together
| Card | Why merchants reach for it |
|---|---|
ph_funnel_conversion | Funnels sibling: the overall conversion rate. |
ph_funnel_time_to_convert | Funnels sibling: how long the journey takes. |
ph_paths_top_route | Funnels sibling: the most common route through the store. |
ph_replays_with_rage_clicks | Session Replay sibling: frustration at the drop step. |
ph_alert_conversion_drop | Nerve Centre sibling: rapid conversion drop alert. |
Reconciling against the vendor’s own dashboard
Where to look in PostHog’s own dashboard: Open your primary funnel insight in PostHog. The per-step bars show the conversion and drop at each stage, and PostHog highlights the largest fall. The step with the steepest decline should match the one this card names. Why the Vortex IQ value may legitimately differ:| Reason | Direction | What to do |
|---|---|---|
| Funnel definition. Adding or removing a step changes where the biggest drop appears. | Variable | Confirm the same step set. |
| Conversion window. A short window pushes drop-off later in the funnel. | Variable | Match the conversion window. |
| Filter scope. Device or channel filters can move the worst step. | Variable | Align the filters. |