GA4 and Google Tag Manager audit
Find data leaks, double-counted conversions and broken GDPR consent settings. Get an independent technical report with prioritised fixes, in 5 to 10 business days.
Order an analytics auditfrom €190 excl. VAT for simple websites, such as B2B company sites. Online stores and larger websites: quote after a free consultation.
Want to check GA4 yourself first? See the free automated GA4 audit. No need to share your data with me.
What the audit checks
1. Conversion and transaction accuracy
We check discrepancies between your CRM or store and GA4, repeated thank-you page refreshes and test purchases.
2. Google Tag Manager structure
We verify triggers and variables, potential JavaScript errors in custom tags and script performance.
3. Consent Mode v2 implementation
We check that tags do not fire before the user decides and that consent is passed correctly to Google Ads.
4. Attribution and referrals
Stopping sales from being attributed to payment gateways (PayPal, Stripe, Klarna, PayU, Przelewy24) instead of the real traffic source.
What you get
- ✓ A Google Docs report: a clear list of errors with fix priority (critical, important, minor).
- ✓ A recording or a meeting: the results explained in plain language.
- ✓ An action plan: ready tasks for your development team or a quote for larger fixes. I fix the simple ones during the audit at no extra cost.
Check GA4 yourself first: a free audit in Data Studio
The free GA4 audit is an automated report in Google Data Studio (formerly Looker Studio) that checks more than 30 data quality areas in a few minutes and colour-codes every result. The report runs on your own Google account, so you share no data with me.
The automation only sees what has already reached GA4. It cannot look into your GTM container, dataLayer or consent banner, so it shows symptoms, not causes. Here is the difference:
| Area | Free audit in Data Studio | GA4 and GTM audit |
|---|---|---|
| Unassigned traffic, self-referrals, UTMs | yes, flags the problem | yes, with the cause and the fix |
| Personal data in URLs | flags the page views | the source of the leak and how to fix it |
| CMP and Consent Mode v2 | symptoms, e.g. Session Start per Session | banner, GTM and consent signal configuration |
| Conversions and transactions | funnel and transactions in GA4 | GA4 compared with your store or CRM, test purchases |
| GTM container and dataLayer | no | yes, tag by tag and event by event |
| Data access | you share no data with me, the report runs on your Google account | access to GA4 and GTM for the duration of the audit |
| Output | a colour and a detail page for every test | a prioritised report, a walkthrough and a fix plan for your developer |
| Confidence | an indicative diagnosis, the automation can be wrong | results checked manually in your property |
| Price | €0 | quote after a free consultation |
Unassigned traffic, self-referrals, UTMs
Free audit
yes, flags the problem
GA4 and GTM audit
yes, with the cause and the fix
Personal data in URLs
Free audit
flags the page views
GA4 and GTM audit
the source of the leak and how to fix it
CMP and Consent Mode v2
Free audit
symptoms, e.g. Session Start per Session
GA4 and GTM audit
banner, GTM and consent signal configuration
Conversions and transactions
Free audit
funnel and transactions in GA4
GA4 and GTM audit
GA4 compared with your store or CRM, test purchases
GTM container and dataLayer
Free audit
no
GA4 and GTM audit
yes, tag by tag and event by event
Data access
Free audit
you share no data with me, the report runs on your Google account
GA4 and GTM audit
access to GA4 and GTM for the duration of the audit
Output
Free audit
a colour and a detail page for every test
GA4 and GTM audit
a prioritised report, a walkthrough and a fix plan for your developer
Confidence
Free audit
an indicative diagnosis, the automation can be wrong
GA4 and GTM audit
results checked manually in your property
Price
Free audit
€0
GA4 and GTM audit
from €190 excl. VAT (simple websites), larger websites: quote after a consultation
Let’s talk about your tracking.
A free consultation: you tell me what is not working, and I tell you where I would start.