Event WatcherOne DevTools panel. tracking platforms.
Debug your whole MarTech stack in real time: every event, consent state, GTM container, and script dependency, right inside Chrome DevTools.
- 100% free
- Runs locally in your browser
- No account required
Everything you need to debug tracking
One DevTools panel replaces dozens of browser extensions, console scripts, and network tab filters.
590+ Platform Recognition
Automatically identifies GA4, Adobe Analytics, Meta Pixel, TikTok, Criteo, Segment, and hundreds more with color-coded badges.
Consent Monitoring
Every tracking event cross-referenced against the visitor's live consent state. CMPs detected automatically, granted and denied categories mapped, and violations flagged: events firing without required marketing or analytics consent.
GTM Hub
Preview, block, or swap GTM containers on any site. Test tag changes in production without publishing: swap a staging container in or block a live one, with rules that persist across reloads.
Script Dependency Tree
Visualize which scripts loaded which other scripts. Trace the full loading chain from page to tag manager to tracking pixel.
AI-Ready Export & Insights
Copy events formatted for humans or size-budgeted for AI chats, stream them live to your own HTTP endpoint, or turn on optional AI summaries and session-wide chat, powered by your own Anthropic, OpenAI, or Gemini key, never a server of ours.
Privacy First
All event processing happens locally in your browser. It works without an account or sign-up, and the URLs you visit are never collected. Optional anonymous usage analytics with one-click opt-out.
What are you debugging?
Step-by-step guides for the questions that bring people to DevTools.
How to check if GA4 fires before consent is given
Use Event Watcher's consent cross-referencing to see whether Google Analytics 4 sends hits before the visitor accepts the cookie banner, and what those hits contain.
How to debug Google Consent Mode v2
Inspect the consent state Google tags actually receive: default and update commands, ad_storage / analytics_storage signals, and how they differ from what your CMP believes.
How to find out which script pushed an event to the dataLayer
Every dataLayer.push has an author: the site, the tag manager, or a third-party script. Event Watcher attributes each push so you can find the source of mystery events.
How to preview or swap a GTM container without publishing
Test a Google Tag Manager container against any live page: block the production container or swap in another one, straight from DevTools, without publishing.
How to audit every tracking pixel on a page in one view
See every tracking platform a page loads (named, categorized, and consent-checked) instead of scrolling through raw DevTools network requests.
All guidesOr jump straight to a platform
Endpoints, key parameters, and consent behavior for the tools you debug most.
Loved on the Chrome Web Store
5.0rating on the Chrome Web Store555weekly usersChrome Web Store numbers as of August 2026.
“Event Watcher is a powerful extension that makes my QA work much easier and despite the extensive list of features it packs, the interface is very well designed for clarity. […] It makes other extensions unnecessary, as it supports so many vendors and platforms. […] Everything you need in one place.”
590+ supported platforms
Every analytics, advertising, and MarTech tool Event Watcher recognizes out of the box, across 14 categories. If it sends a network request, it shows up in your DevTools with a name, an icon, and a category badge.
Platform list as of Event Watcher v1.4.2. New platforms ship in nearly every release.
Per-platform debugging guides
In-depth pages for the 56 most-used platforms: endpoints, key parameters, consent behavior, and common debugging scenarios.
AB Tasty
Adobe Analytics
Adobe Data Layer
Adobe Tags (Launch)
Adobe Target
Amplitude
Bing Ads
Braze
ContentSquare
Cookiebot
Criteo
Datadog RUM
dataLayer
Didomi
Facebook
FullStory
Google Ads Conversion
Google AdSense
Google Analytics 4
Google Consent Mode
Google Tag
Google Tag Manager
Heap Analytics
Hotjar
HubSpot
Klaviyo
LinkedIn
LogRocket
Mailchimp
Matomo/Piwik
Microsoft Clarity
Mixpanel
mParticle
OneTrust
Optimizely
Piano Analytics
Pinterest
Piwik Pro Analytics
PostHog- Prebid.js
Reddit
RudderStack
Salesforce Marketing
Segment
Sentry
sGTM
Snapchat
Snowplow
Sourcepoint
Taboola
Tealium Collect
Tealium iQ
TikTok
TrustArc
Usercentrics
VWO
Missing a platform?
Event Watcher still captures unrecognized tracking requests, you can map custom endpoints yourself, or report a missing tool straight from the panel. Most requests ship in the next release.
See it in action
Five view modes on the same captured session. Switch to the perspective the task at hand needs, right inside Chrome DevTools.
Stream View
The default real-time timeline: network requests, dataLayer pushes, and script loads appear the instant they fire, with platform badges and source indicators.
Grouped View
Pivot the same captured events eight ways (by Tool, Page, Event Name, Consent Category, dataLayer, Endpoint, Cookie, or Identity) without re-capturing.
Script Tree View
The full script loading chain: which scripts loaded which other scripts, from the initial page load through tag managers to individual tracking pixels.
Stack View
The site's whole MarTech stack as a tree (page → tag manager → vendor tools), with attribution-confidence dots and export to Markdown, Mermaid, or SVG.
Pinned View
A per-domain parking spot where pinned events survive Clear and page reloads, with per-pin notes and groups to organize an investigation in place.
AI Insights · Bring your own key
Let AI read the stack for you
Turn a wall of raw tracking calls into something you can reason about, without leaving DevTools. Optional, off by default, and powered by a key you control.
Event summaries
A plain-English read of any event: what it is, what it's tracking, and whether anything looks off.
Session-wide chat
Ask questions across everything you captured. “Which events fired before consent?” Answered.
Identify unknowns
One click to name an unrecognized tool from the shape of its request.
Requests go straight from your browser to the provider you choose. There is no Event Watcher server or proxy in the path, and nothing is logged. PII redaction is on by default.
This is a GA4 purchase event firing after checkout completes.
- •Sends
value(128.0),currency(EUR) and 3 items. - Fired after analytics consent was granted.
ad_user_datais denied, so the Ads conversion may not register.
Integration
Built to hand off to MartechStack Builder
Event Watcher's Stack view captures a site's livemartech stack: every platform that's actually loaded, and how it's wired together (page → tag manager → vendor tools). One click exports that as MartechStack Builder JSON.
Open it in MartechStack Builder (a tool for designing and visualizing martech stacks) via File → Import JSON, and what Event Watcher discovered becomes an editable diagram you can share, present, or hand to a client.
- Vendor logos, brand colours, and capability metadata auto-attach on import
- Nodes arrive pre-categorized, with the page → tag manager → tool relationships intact
- Goes from a live capture to a shareable stack diagram in a few clicks
Event Watcher is listed in MartechStack Builder's integrations directory.
Start debugging smarter today
Install in seconds, open DevTools, and see every tracking event on any page.
Add to ChromeFree on the Chrome Web Store · no account required