First-Party vs Third-Party Analytics: Why One Gets Blocked

"First-party" and "third-party" sound like jargon, but the distinction is the single thing that decides whether ad blockers can hide your traffic. Here's what the terms mean and why it matters for accuracy.

The distinction is about where the request goes

When a page loads an analytics script, the browser makes a network request to fetch it and later to send the data. The key question is: does that request go to your domain, or to someone else's?

• Third-party analytics load their script from, and send data to, a domain that isn't yours — google-analytics.com, googletagmanager.com, or a shared analytics-vendor domain used across thousands of sites.
• First-party analytics load and send to your own domain (or a subdomain of it). To the browser, it looks like any other request your site makes for its own content.

Why third-party requests get blocked

Ad blockers and tracker-blockers work from lists of known third-party tracking domains. google-analytics.com is on every one of them. When uBlock Origin, Brave Shields or Firefox's strict mode sees a request heading to a domain on the list, it cancels it before it leaves the browser. The script never loads; the data never sends. No visit recorded, no warning in your dashboard.

This is by design, and it's not going away. The block lists are maintained by communities specifically to stop cross-site tracking, and third-party analytics domains are the textbook target.

"But Plausible and Fathom are privacy-first — aren't they fine?"

Privacy-first is about what data a tool collects. Blocking is about where the request goes. They're different axes. Plausible and Fathom collect very little and don't use cookies, which is great — but their default setup still loads script from a shared vendor domain, so the most aggressive block lists catch a slice of their traffic too.

All of them offer a workaround: a first-party proxy that routes the analytics request through your own domain. It works — but it's setup you have to configure and maintain, and many users never do it, so they ship the blockable default. See the head-to-head details on Logly vs Plausible and Logly vs Fathom.

What first-party doesn't fix

First-party solves the blocking problem, but it's not magic. It doesn't excuse you from privacy law — a first-party tool that sets a tracking cookie still needs consent. The reason a tool like Logly skips the banner is that it's first-party and cookieless and stores no personal data; first-party alone isn't enough. And first-party doesn't fix metric-quality issues like wall-clock session timing — that's a separate design choice.

The takeaway

If accurate visitor counts matter, first-party delivery is the non-negotiable part: it's the only way to record visitors with ad blockers, who are 25–45% of many audiences. Cookieless and privacy-respecting then remove the consent banner on top. Logly is built first-party and cookieless from the ground up for exactly this reason.