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Millimetric vs.

Google Analytics 4

Same answers, none of the third-party cookies.

In one paragraph

GA4 is free and ubiquitous, but it's also why your site ships a Google-tracker cookie banner, your PageSpeed score is bleeding, and your data lives on a server you don't control. Millimetric is built for teams that want the answer to 'how many signups did we get from HN?' without donating their visitors to an ad network.

Pick GA4 when…

  • You run paid Google Ads and need GA4 → Google Ads conversion import.
  • You have an analyst who already speaks the Looker Studio dialect.
  • Your stakeholders demand 'industry standard' and won't accept anything else.

Pick Millimetric when…

  • You don't want a Google-tracker cookie banner on your landing page.
  • You want raw event JSON, not 'sampled' aggregates.
  • You want an AI agent to read your analytics over MCP without a service account.
  • You ship from EU, UK, or California and don't want a Schrems II legal-review every quarter.
Feature
Millimetric
GA4
  • Setup
    One <script> tag. Or curl.
    Property + stream + GTM container, often
  • Cookies
    None.
    _ga, _gid, _gat (1st-party)
  • Third-party tracking cookies
    None
    Yes (1st-party _ga, integrated with Google's ad graph)
  • Data residency
    EU & US regions
    Google global infrastructure
  • Bundle size (client)
    1.8 KB gzipped
    ~45 KB gtag.js
  • Raw event export
    REST + JSON, included
    BigQuery export (free tier limited)
  • AI-agent access (MCP)
    Native MCP server
    Not supported
  • Attribution explainability
    Rule ID + confidence on every event
    Black-box DDA / last-click
  • Sampling at scale
    None
    Yes, above thresholds
  • Free tier
    100k events / mo, forever
    Free, with data caps & sampling
  • Looker Studio connector
    REST connector + CSV export
    Native
  • Google Ads conversion import
    Webhook → Ads API
    Native

Last reviewed May 2026. Spotted an out-of-date detail? Tell us.

Our verdict

If you live inside Google Ads and have an analyst, stay on GA4 — the integration is real. For everyone else (most vibe coders and small teams), Millimetric is faster to set up, lighter on the page, and you keep your visitors' data in your own jurisdiction.

Try Millimetric free Read the docs

FAQ

Can I run Millimetric alongside GA4?
Yes — many teams keep GA4 for Ads conversion import and use Millimetric for the day-to-day 'is the site working' answer. The endpoints don't conflict.
Will I lose historical GA4 data?
No. Your GA4 history stays in BigQuery (export it before sunset). Millimetric starts collecting from the day you install.
Does Millimetric do server-side tagging like GA4 + GTM Server?
It is server-side tagging — every event is a POST to api.millimetric.ai. You can fire events from the browser, your backend, an AI agent, or a CRON. Same endpoint.

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