Live Monitor Run

checkout.example.com

4/5
Assertions Passed
Journey Execution
navigate/thank-you
clickAdd to Cart
typeemail
clickPurchase
Assertions
GTM_LOADSPASS
GA4_HITSPASS
EVENT: purchasePASS
DATALAYERPASS
PAYLOADFAIL
Network Capture
gtm.js
analytics.js
collect?v=2
purchase event
fbevents.js
Screenshot
CAPTURED
Network HAR
CAPTURED
Console Log
CAPTURED
GA4 Decoded
CAPTURED
Monitoring: Active

AUTOMATE
TAG_AUDIT
OPERATIONS.

Headless browser monitoring for GTM & GA4. We run real Chromium sessions, simulate user journeys, and validate every tag fires with the right data.

Free plan available — no credit card required

Core_Modules

Technical Capability Matrix

01. HEADLESS_EXECUTION

Real Chromium browser sessions simulate multi-step user journeys — clicks, form fills, page navigations. Validates tag firing on SPAs and dynamic pages where HTTP checks fail.

  • Multi-step journey simulation (up to 10 steps)
  • SPA & dynamic page support
02. EVIDENCE_COLLECTION

Every run captures screenshots at each step, full network traces, console logs, decoded GA4 requests, and dataLayer snapshots at multiple time points.

  • GA4 request decoding
  • Timed dataLayer snapshots
03. ASSERTION_ENGINE

5 built-in validators for GTM & GA4: container loading, hit counting, event parameter validation, payload structure checks, and dataLayer key verification. Pre-built templates for e-commerce, SaaS, and basic tracking.

  • 5 specialized validators
  • Pre-built assertion templates

Run_Detail_View

Everything You Need to Debug in One Place

app.tagsentry.cc/monitors/m_8x2k/runs/run_47f3
Checkout Funnel — Production
shop.example.com/checkout · Run #47 · 2m 14s · Feb 22, 2026 14:32
5/5 PASSED
Step 4 — Screenshot1440×900
PURCHASE
STEP 4/4
Journey Steps
navigate /checkout
1,240ms
type email → test@co.com
180ms
type card → ****4242
220ms
click "Complete Purchase"
340ms
GA4 Decoded EventVALID
event_namepurchase
transaction_idTXN_8f2a91
value149.00
currencyUSD
items[1 item]
item_name: "Pro Plan"
item_category: "subscription"
price: 149.00
Assertion Results
GTM_LOADS
GTM-XXXX connected
820ms
GA4_HITS ≥ 1
3 hits captured
1,430ms
EVENT: purchase
event found in hits
1,680ms
PAYLOAD_VALID
all required params
1,680ms
DATALAYER_KEY
ecommerce.purchase
1,240ms
DataLayer Snapshott+1,240ms
{
"event": "purchase",
"ecommerce": {
"transaction_id": "TXN_8f2a91",
"value": 149.00,
"currency": "USD"
}
}
Network Trace14 requests
gtm.js200
analytics.js200
collect?v=2&en=page_view204
collect?v=2&en=begin_checkout204
collect?v=2&en=purchase204
fbevents.js200
Console Log
[info] GTM container loaded
[info] GA4 config initialized
[info] dataLayer push: begin_checkout
[info] dataLayer push: purchase ✓
Recent RunsLast 24 hours
24h ago12h agonow

Process_Pipeline

System Operational Flow

01

Target_Ingestion

Enter your site URL. Add optional journey steps — clicks, form fills, page navigations — to simulate real user flows.

02

Assertion_Config

Choose from pre-built templates (Basic Tracking, E-commerce, SaaS Lead Gen) or define custom assertions for GTM, GA4 events, and dataLayer values.

03

Scheduled_Monitoring

Run monitors manually or schedule hourly, every 6 hours, or daily checks. Catch silent tag breaks before they corrupt your data.

04

Evidence_Report

Failed assertions generate evidence packs: screenshots, decoded GA4 requests, network traces, and console logs for fast debugging.

Licensing_Models

Scale-Based Deployment

Instance_Standard
$0
MONITORS01
CHECK_INTERVALMANUAL
EVIDENCE_PACKSYES
Start Free
RECOMMENDED
Instance_Production
$49/mo
MONITORS10
CHECK_INTERVAL1H
EVIDENCE_PACKSYES
Start Free
Instance_Agency
$149/mo
MONITORS50
CHECK_INTERVAL1H
MULTI_CLIENTYES
Start Free
Instance_Enterprise
$299/mo
MONITORS200+
CHECK_INTERVAL1H
MULTI_CLIENTYES
Contact Us

All plans include a 14-day free trial on paid tiers. No credit card required to start.

$ tagsentry monitor:run --url checkout.example.com

Eliminate data leakage permanently.

Stop finding out your tracking broke last week. Know the moment it happens.