UTM source and referrer analysis
Understand how OmniLab Smart Links reports UTM sources and referrers, and why they are not always the same.
Read your channel performance more accurately by understanding two signals that look similar but answer different questions. This page explains the difference between Top UTM Sources and Top Referrers in OmniLab Smart Link analytics.
A UTM source is a label you add to a link to record which channel sent the traffic — for example, tagging a link as coming from your newsletter or from Instagram. A referrer is the website the visitor's browser says they came from. One is the label you planned; the other is what the browser actually reports.
Why these two are different
The UTM source and the referrer are related, but they are not the same thing:
| Signal | What it represents |
|---|---|
| UTM source | The channel label you added to the link |
| Referrer | The website the visitor came from, when the browser reports it |
Because they describe traffic in different ways, it is normal for them to tell slightly different stories.
The Top UTM Sources and Top Referrers lists appear in the analytics view with the other charts once data is available for the period you selected.
What Top UTM Sources shows
Top UTM Sources highlights the channel labels that traveled with the OmniLab Smart Link traffic.
Use it when:
- you set source labels on the main OmniLab Smart Link
- variants carry their own campaign or placement labels
- you want a clean, consistent set of channel names across print, email, social, and partner traffic
Examples of source labels:
newsletterinstagramwindow-posterpartner-event
What Top Referrers shows
Top Referrers reports where the traffic appeared to come from, when the browser or app shares that information.
Typical examples:
- a website
- a partner page
- a newsletter platform's tracked redirect
- a social platform webview
Why UTM source and referrer may not match
A mismatch is expected in several situations:
- A link tagged
utm_source=newslettershows the email platform's domain as the referrer. - A QR scan carries a source like
window-posterbut has no website referrer at all. - A privacy feature, camera app, or in-app browser hides or changes the referrer.
That is why many teams treat the UTM source as the channel they planned, and the referrer as the traffic they actually observed.
How to use both together
The best read usually comes from looking at both lists side by side:
| Your question | Start with |
|---|---|
| Which planned channel or placement performed best? | Top UTM Sources |
| Which website or platform sent the traffic? | Top Referrers |
| Why did one placement spike? | Compare both with Scans Over Time |
| Which physical asset drove traffic? | Combine with Scans by Variant |
A practical example
Suppose one OmniLab Smart Link is used in three places:
- a printed poster
- a newsletter
- an Instagram bio
You might configure:
utm_source=posteron one variantutm_source=newsletteron anotherutm_source=instagramon a third
Later, Top UTM Sources helps compare the planned channels. Top Referrers may show that Instagram and newsletter traffic came through specific web contexts, while the poster traffic had little or no referrer data at all.
Related
UTM parameters & custom variables
Set up the tracking values that later appear in OmniLab Smart Link reporting.
OmniLab Smart Link Analytics
See where UTM source and referrer widgets sit in the wider per-link analytics view.
Scans by variant
Combine channel insight with placement-level variant reporting.