> ## Documentation Index > Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt > Use this file to discover all available pages before exploring further. # Biggest Funnel Step Drop-off, PostHog > Biggest Funnel Step Drop-off for PostHog stores. Tracked live in Vortex IQ Nerve Centre. How to read it, why it matters, and how to act on it. **Card class:** [Hero](/nerve-centre/overview#card-classes-explained) • **Category:** [Analytics](/nerve-centre/connectors#connectors-by-type) ## 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`](/nerve-centre/kpi-cards/posthog/primary-funnel-conversion) | Funnels sibling: the overall conversion rate. | | [`ph_funnel_time_to_convert`](/nerve-centre/kpi-cards/posthog/avg-time-to-convert) | Funnels sibling: how long the journey takes. | | [`ph_paths_top_route`](/nerve-centre/kpi-cards/posthog/top-user-path) | Funnels sibling: the most common route through the store. | | [`ph_replays_with_rage_clicks`](/nerve-centre/kpi-cards/posthog/replays-containing-rage-clicks) | Session Replay sibling: frustration at the drop step. | | [`ph_alert_conversion_drop`](/nerve-centre/kpi-cards/posthog/funnel-conversion-drop-5pp-in-24h) | 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. | **Cross-connector reconciliation:** complement with sibling cards in the same category for the full diagnostic picture. For divergence investigations, use Vortex Mind. ## Known limitations / merchant FAQs **Q: How often does Biggest Funnel Step Drop-off update?** The card refreshes on the standard data refresh (typically every 30-60 minutes for live integrations). For real-time signals, force a manual refresh from the dashboard. **Q: Is a high drop-off always bad?** Not always. The drop from pageview to product view is naturally large because many visitors browse the homepage and leave. Focus on drops that are large relative to a normal benchmark for that step. **Q: The biggest drop moved to a different step. Why?** A fix to the previous worst step, or a new friction point introduced by a deploy, can shift where most users abandon. Treat a moving worst step as a signal that the funnel shape changed. **Q: Can I customise the alert threshold?** Yes, sensitivity thresholds are configurable per profile in the Sensitivity tab. Adjust to match your business baseline rather than relying on the generic default. *** ### Tracked live in Vortex IQ Nerve Centre *Biggest Funnel Step Drop-off* is one of hundreds of KPI pulses Vortex IQ tracks across PostHog and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. [Start for free](https://app.vortexiq.ai/login) or [book a demo](https://www.vortexiq.ai/contact-us) to see this metric running on your own data.