Funnel Conversion Drop (>5pp in 24h), Amplitude

Funnel Conversion Drop (>5pp in 24h) for Amplitude stores. Tracked live in Vortex IQ Nerve Centre. How to read it, why it matters, and how to act on it.

Metrics type: Key Metrics • Category: Analytics

At a glance

Funnel Conversion Drop (>5pp in 24h) is a real-time alert card in Nerve Centre that fires when your primary Amplitude funnel loses more than 5 percentage points of end-to-end conversion inside a 24-hour window. A sudden drop of that size is rarely organic. It usually points to a broken checkout step, a payment outage, a deploy that changed a button or form, or a tracking regression that is quietly dropping events. The card counts how many such alerts are currently active so you can triage fast before the lost conversion compounds into lost revenue.

What it counts	The count of active alerts where the primary funnel conversion rate has fallen by more than 5 percentage points within a 24-hour period, measured from Amplitude funnel data.
Sample type	Real-time alert evaluation against Amplitude funnel conversion data, refreshed continuously in Nerve Centre.
Why it matters	A multi-point conversion drop inside a day is a revenue emergency. Catching it in real time lets you intervene before a full day of traffic converts at the lower rate.
Reading the value	A value above zero means one or more drop conditions are live. Open the alert to see which funnel and which step moved, then act on the underlying cause.
Currency	count
Time window	RT
Alert trigger	primary funnel conversion down >5pp in 24h
Sentiment key	amp_alert_conversion_drop
Roles	owner, marketing

Calculation

Nerve Centre evaluates your primary Amplitude funnel’s end-to-end conversion rate on a rolling basis and compares the current 24-hour reading against the prior comparable window. When the conversion rate falls by more than 5 percentage points, the alert fires and is added to the active count shown on this card. The card value is the number of such alerts currently open. See the At a glance summary above for what the card tracks and the worked example below for a typical reading.

Worked example

A representative reading of Funnel Conversion Drop (>5pp in 24h) for a typical merchant on Amplitude. Yesterday the checkout funnel converted at 3.8 percent end to end. By midday on 14 Mar 26 the same funnel was running at 2.1 percent, a fall of 1.7 points, then slid to 2.0 percent. That crosses the threshold for the day-on-day comparison the card uses, so the alert fires and the card reads 1. The team opens the alert and sees the drop concentrated at the payment step, which lines up with a payment-gateway timeout that started that morning. Vortex Mind traces the regression to a failed gateway health check rather than a tracking gap, and Ask Viq is used to ask, in plain English, how much revenue was lost during the affected hours so the team can prioritise the fix and the recovery.

Sibling cards merchants should reference together

Card	Why merchants reach for it
amp_funnel_conversion	Shows the underlying funnel conversion rate this alert watches.
amp_funnel_step_dropoff	Pinpoints which step is leaking when the alert fires.
amp_alert_event_volume_drop	Confirms whether the drop is real or a tracking volume issue.
amp_alert_tracking_broken	Rules out a stopped core event as the cause.
amp_health_score	Gives overall instrumentation confidence behind the funnel data.

Reconciling against Amplitude

Where to look in Amplitude’s own dashboard:

Open the Funnels report for your primary conversion path and set the comparison to day over day. Amplitude’s own anomaly detection and Alerts can also be configured on the funnel conversion rate; compare what Nerve Centre flagged against Amplitude’s funnel trend and any native alert that fired in the same window. Confirm the funnel definition, the conversion window, and the segment match the Vortex IQ profile before concluding the readings disagree.

Why the Vortex IQ value may legitimately differ:

Reason	Direction	What to do
Period boundary. Nerve Centre evaluates a rolling 24-hour window; Amplitude funnels may be viewed on calendar-day boundaries.	Variable	Align both to the same 24-hour window.
Time zone. Amplitude uses the project time zone; Vortex IQ aligns to the merchant reporting time zone.	Marginal	Confirm time zone match.
Filter and segment scope. Profile-level filters (channel, device, test traffic) can narrow the funnel the alert evaluates.	Variable	Match segment and filter settings.

Cross-connector reconciliation: when an alert fires, complement the Amplitude funnel view with the sibling cards above and your ecommerce platform’s own order data for the same hours. For divergence investigations, use Vortex Mind.

Known limitations / merchant FAQs

Q: How quickly does this alert fire after a drop starts? It evaluates in real time against incoming Amplitude funnel data, so it surfaces within the same Nerve Centre refresh cycle once the 5-point threshold is crossed. There is a short detection lag while enough sessions accumulate to make the rate reliable.

Q: Why does my Amplitude funnel show the drop but the alert reads zero? The most common reasons are the funnel definition, conversion window, or segment differing between Amplitude and the Vortex IQ profile, plus time-zone and period-boundary alignment. Match these settings before assuming a real divergence.

Q: How does this relate to the event volume and tracking alerts? A conversion drop can be caused by a genuine purchase decline or by a tracking gap that stops counting completions. Read this card alongside the event volume drop and tracking broken alerts to tell a real conversion problem apart from an instrumentation one.

Q: Can I customise the alert threshold? Yes, the 5-point trigger and the comparison window are configurable per profile in the Alert Rules tab. Tune them to your funnel’s normal daily variance rather than relying on the generic default.

---

Tracked live in Vortex IQ Nerve Centre

Funnel Conversion Drop (>5pp in 24h) is one of hundreds of KPI pulses Vortex IQ tracks across Amplitude 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 or book a demo to see this metric running on your own data.