New vs Returning Users, PostHog

New vs Returning Users for PostHog stores. Tracked live in Vortex IQ Nerve Centre. How to read it, why it matters, and how to act on it.

Metrics type: Supporting Metrics • Category: Analytics

At a glance

New vs Returning Users is a retention metric tracked from PostHog data. It splits your active audience into first-time visitors and people who have been seen before, shown as a share of the whole. The balance is a direct read on where your growth comes from: a store leaning heavily on new users is acquisition-driven and fragile, while a healthy returning share means the audience you paid to acquire keeps coming back.

What it counts	The split of active users into new and returning, shown by share, for the period.
Sample type	Backend API data from PostHog, derived from first-seen versus prior-seen users on the standard data refresh.
Why it matters	The new-to-returning balance tells you whether growth is durable. Too few returning users means every month starts from scratch.
Reading the value	Read the two shares. A rising returning share usually signals improving loyalty and retention.
Currency	count
Time window	30D
Alert trigger	-
Sentiment key	ph_new_vs_returning
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 New vs Returning Users for a typical merchant on PostHog. Suppose the donut shows 68% new and 32% returning over 30 days. After a post-purchase email programme launched on 20 Mar 26, the returning share climbs to 41% while total active users hold steady. That shift means the same traffic is now producing more repeat visits, a healthier mix even without more acquisition spend. Cross-reference D30 Retention and Stickiness to confirm the returning users are genuinely sticking. 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
pos_new_users	Audience sibling: count of new users.
pos_returning_users	Audience sibling: count of returning users.
ph_retention_d30	Retention sibling: 30-day return rate.
ph_stickiness	Retention sibling: DAU as a share of MAU.
ph_mau	Executive sibling: monthly active base.

Reconciling against the vendor’s own dashboard

Where to look in PostHog’s own dashboard:

In PostHog, a trend insight broken down by the new-versus-returning user property gives this split. Align the date range and any filters with the Vortex IQ profile. PostHog decides “new” by first-seen date, so a user is new only on their first appearance.

Why the Vortex IQ value may legitimately differ:

Reason	Direction	What to do
New definition. “New” is based on first-seen date; identity merges can reclassify users.	Variable	Allow for identity stitching.
Window length. A longer window reduces the new share as more users become returning.	Variable	Match the window length.
Filter scope. Channel or device filters change the mix.	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 New vs Returning Users 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: What counts as a returning user? A user whose first-seen date is before the current period and who is active again within it. PostHog tracks first-seen at the person level, so a returning user has appeared at least once before.

Q: Is a high new share bad? Not on its own. Fast-growing stores naturally skew new. It becomes a concern when the returning share never builds, which means acquisition is not converting into loyalty.

Q: Can I customise the alert threshold? Yes, alert thresholds are configurable per profile in the Alert Rules tab. Adjust to match your business baseline rather than relying on the generic default.

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Tracked live in Vortex IQ Nerve Centre

New vs Returning Users 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 or book a demo to see this metric running on your own data.