GA4 Validation
Measurement IDs detected, event consistency by flow, duplicate hit detection.
Real-browser tracking diagnostic
AuditTags — check the browser-side signals behind GA4, Ads, Meta, and revenue mismatches
AuditTags runs a real-browser scan and groups the evidence most likely to distort paid-ads reporting: GA4/GTM detection, consent defaults, duplicate events, missing ecommerce signals, and failed tracker requests. For backend revenue, Ads account, or Meta CAPI gaps, the report shows what the browser scan can and cannot prove.
- GA4 / GTM / CMP presence and consent-default heuristics
- Duplicate ad-tracking pixels and failed tracker requests
- Honest disclosure of what the browser scan does not prove
- Works across Shopify, WooCommerce, custom storefronts, and lead-gen sites
Run a tracking diagnosticReal-browser scan · No theme changes · Read-only
Read the diagnostic playbookReal-browser diagnostics · No background monitoring · Read-only
Example of a tracking mismatch the scan surfaces:
Critical Issue Detected
Duplicate Purchase Events
Your store fired the
purchase event more than once. This can inflate revenue calculations and break attribution models.Built for Shopify & DTC
Real browser execution, not static checks
Deterministic engine, repeatable results
Used by agencies & performance teams
Your tracking breaks more often than you think — and rarely where you expect.
1
Shopify theme pushes modify HTML structure
→ GTM triggers stop firing
2
App installs inject duplicate tracking scripts
→ Revenue metrics double-count
3
CMP vendors block scripts until consent
→ But GA4 events still fire incorrectly
4
Purchase events double-fire or fail to fire entirely
→ Revenue data becomes unreliable
5
Manual debugging is slow and inconsistent
→ Issues vary across devices and regions
Real Tracking Failures We Detect
Each failure maps to a specific detector in the AuditTags engine.
| Failure | Impact | Detected by |
|---|---|---|
| GA4 installed but purchase event missing | Revenue not recorded in GA4. Ad ROAS calculations break. | Ecommerce event validation |
| GTM loads after purchase event fires | Conversions lost. Campaign attribution incomplete. | Tag firing sequence check |
| Consent Mode blocks analytics silently | EU traffic underreported. GA4 shows partial data. | Consent state (gcs) parameter inspection |
| Duplicate GA4 tags from theme + GTM | Revenue appears inflated by 2x. Sessions double-counted. | Duplicate GA4 purchase detection |
| Shopify app injects second Facebook Pixel | Facebook sees duplicate events. Ad optimization degrades. | Duplicate Facebook Pixel detection |
Exactly what AuditTags does — no magic, no exaggeration.
A transparent, technical explanation of the scan process.
1
Launches a headless Chromium session
- Same engine as Chrome
- Real JS execution
- Real network capture
- Consent and CMP banners included in behavior
2
Navigates core storefront flows
- Home
- Product page
- Add to Cart
- Cart
- Checkout entry (detects begin_checkout and related analytics events)
- Most tracking failures appear before purchase — issues are detected without completing a checkout
3
Captures and analyzes
- GA4 requests (collect hits)
- GTM container scripts and fired tags
- Consent Mode gcs signals
- Duplicate trackers
- Shopify detection
- All network requests (to detect leaks, duplicates, and misfires)
4
Runs deterministic rule-based checks
- Checks 31 tracking integrity rules
- Validates Consent Mode behavior
- Flags script conflicts and ignored CMP signals
- Assigns a 0–100 health score (P0/P1/P2 deductions)
5
Outputs a canonical report
- Full GA4/GTM findings
- Severity-ranked issues
- Detection summary
- Raw network evidence
- PDF + JSON access
- No PII, no page indexing, no DOM snapshots stored
A real-browser tracking diagnostic your team would need hours to run manually.
GTM Integrity
Container detection, tag firing consistency, blocked tags, missing triggers.
Consent Mode v2
gcs parameter inspection, pre/post-consent behavior validation.
Duplicate Tracker Detection
Facebook, TikTok, Klaviyo, ad scripts, theme-injected extras.
Shopify Signal Validation
Platform signature detection, network pattern matching.
Network Evidence
All collected hits with timestamp, status, and source.
PDF + JSON Output
Generated on-demand, deterministic, uses the engine's canonical presentation summary.
Tracking Audits
Validate tracking accuracy using GA4, GTM, and Shopify diagnostics. Run targeted audits or explore the complete website tag auditing guide.
Free Tracking Diagnostic shows 3 essential checks — and locks the remaining 39.
The issue check is intentionally limited. If the first 3 checks are green, that does not mean your site is healthy.
A clean issue check only confirms that GA4, GTM, and a CMP are present on page load. It does not validate event consistency, duplicate tracking, consent behavior, or purchase flow integrity.
Free Tracking Diagnostic Shows
- GA4 presence
- GTM presence
- CMP presence
Locked (39 checks)
- Duplicate purchase events
- Consent Mode violations
- Misfiring GTM tags
- Blocked scripts
- Missing GA4 hits in flows
- Duplicate pixels
- DataLayer integrity
- Timing-based tracker conflicts
- And 31 more...
$79/mo. Re-scan after every change. Cancel anytime.
Theme updates, app installs, checkout customizations — each one can break your tracking.
50 monthly health checks
Scan history dashboard
Cancel anytime — no annual contract
Downgrade to one-time anytime
No agencies·Self-serve·No sales calls·No upsell pressure
Just need a single audit? $49 one-time →
Your site's data stays yours. AuditTags never touches customer PII.
- We do not store customer PII
- We do not collect checkout data
- We never store sensitive DOM content
- We only parse public JS, dataLayer, and network requests
- GDPR-aligned
- Engine isolated, sandboxed browser instance
- Signed request infrastructure with HMAC enforcement
- All scan fetches require SERVICE_ROLE_KEY authentication
- Scan data is stored securely while your account exists and can be deleted on request
Technical FAQ for skeptical CTOs
From the AuditTags Blog
Real-browser diagnostic insights for Shopify GA4 and GTM setups
Consent ModeGoogle AdsGA4
Consent Mode v2 in 2026: Why GA4 and Google Ads Disagree
GA4 says one number, Google Ads says another, Meta a third. Consent Mode v2 is the silent cause — here's how to find and fix it.
AuditTags Engineering• Paid-Ads Tracking Specialists
11 min read
Read article
ShopifyGA4Checkout
Shopify Checkout Extensibility: Why GA4 Tracking Breaks
Migrating from checkout.liquid to checkout extensibility breaks GA4 purchase tracking for most stores. Here is what changes and what you need to do.
AuditTags Engineering• Shopify Analytics Specialists
10 min read
Read article
GTMShopifyTroubleshooting
GTM Container Firing Twice on Shopify — How to Find It and Stop It
A GTM container loading twice doubles every event count and wrecks attribution. Here is how to detect it and which Shopify setups cause it.
AuditTags Engineering• Shopify Analytics Specialists
10 min read
Read article
See where your tracking is breaking. Run a real-browser diagnostic.
A read-only scan that surfaces the consent, tag-loading, and attribution evidence behind GA4 / Google Ads / Meta number disagreements. Severity-ranked findings with a PDF report. No theme changes. No background monitoring.