Dropped — in the bin. 10 events your reporting never counted.
Ferri Tracking rebuilds the measurement layer server-side. Ecommerce accounts move from 30–40% conversion coverage to 85–90%. Aesthetic clinics from 40–50% to the same 85–90%.
None of this is our finding. It is the environment every agency is already buying media in.
7 days
Safari caps the lifetime of any cookie your JavaScript sets to seven days. Arrive from a domain Safari has classified as a tracker, with a query string on the landing URL, and that drops to one.
Origin Apple · WebKit — ITP 2.2, 2019 · Full Third-Party Cookie Blocking, 2020
27%
That is how many people accept Apple's App Tracking Transparency prompt worldwide — 31% in the US, 22% in the EU. Campaigns running inside the Meta and TikTok apps lose their attribution signal for everyone else, which is the gap the Conversions API exists to close.
Origin Flurry · Business of Apps, 2026
29.5%
Nearly a third of internet users run an ad blocker at least some of the time. A blocked pixel does not fail loudly — it reports a smaller number and looks perfectly healthy.
Origin GWI via DataReportal, Q2 2025
Coverage is the share of real conversions that survive to your reporting. It is not a lift in sales — it is the end of guessing which third of them you are looking at.
Ecommerce
Aesthetic clinics
Measured on client accounts across both segments. Other verticals land at the same 85–90% ceiling; the distance travelled depends only on how far the browser had already fallen.
Instrument it, recover what the browser refuses to send, then read it. Anyone can do one of these. The gap closes when the same hands do all three.
Server-side GTM and the Conversions API. The event leaves your server, where a cookie policy, a blocker, or an OS prompt cannot quietly delete it first. Deduplicated against the browser event, not stacked on top of it.
Pass 01 sGTM · CAPI · deduplication
GTM, GA4, platform pixels, ecommerce events and consent mode, instrumented end to end and documented. Fourteen days from audit to handover, and your team never becomes the bottleneck.
Pass 02 GTM · GA4 · consent mode
The model, the reconciliation, and the reporting your client actually reads. What each channel returned, against what each platform claims it returned, with the discrepancy named rather than absorbed.
Pass 03 attribution · reconciliation
Send one account. We measure what it is actually capturing, and you get the findings whether or not you ever hire us.
It is the fastest way to find out whether this is a problem you have. Most agencies discover the number is worse than they assumed, on an account they considered healthy.
What comes back
Guarantee. If your coverage has not moved against the baseline we measured on day zero, we refund what you paid. One month, and the same measurement at both ends.
What we need from you
No changes are made to anything. Nothing is installed, no tag is published, and no media is touched. No meeting either — the report arrives by email when it is done. If the findings are not useful, that is the end of it.
No engagement, no access to your media, and nothing installed. Read-only, and the findings are yours either way.
We measure what the account captures today and where it leaks. Day zero, before anything is agreed.
Server-side GTM stood up on your own subdomain, with the hosting, certificates and logging that survive an audit later.
Events, ecommerce, consent mode and the Conversions API wired and deduplicated across every platform the account runs.
Coverage measured again against the day-zero baseline, discrepancies documented, and the whole build handed over in writing.
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