Tracking Health Check
Scan any page for tracking scripts — dead pixels, render-blocking tags, duplicates, and double-counting risks. Free, no signup.
what the sweep checks
21 tracking vendors, one pass.
The sweep fetches the page you enter and reads its HTML the way a crawler would. It recognizes tag managers, analytics, ad pixels, heatmaps and email tools by their script URLs and install snippets, then checks how each one is installed.
It's a static scan, so tags injected later (by Google Tag Manager, for example) won't appear, and it can't see events fire. Watching real fires on real traffic is what verification does.
What's installed
Every recognized tag manager, analytics tool, ad pixel, heatmap and email script on the page.
Dead weight
Legacy tags that no longer do anything, like Universal Analytics, which stopped processing data in July 2023.
Render-blocking loads
Script tags without async or defer that hold up the page from painting.
Duplicate installs
The same vendor loaded more than once, which usually sends every event twice.
GTM double-counting risk
Google Tag Manager next to a hardcoded GA4 tag or Meta Pixel, a common source of inflated numbers.
Server-side readiness
How exposed the page is to ad blockers, and whether conversions have a path that doesn't depend on the browser.
questions
Asked and answered.
Is the tracking health check really free?+
Yes. There's no signup and no limit beyond a rate limit that keeps the scanner from being abused. Point it at any public URL.
Why doesn't it find a tag I know is there?+
Most likely the tag is added at runtime, usually by Google Tag Manager or a consent tool, so it isn't in the HTML the scan reads. The scan will still show GTM itself.
Can it tell me whether my conversions are tracking?+
No. It checks how tags are installed, not whether events fire. TracerKit's Verification tier watches each tag on real traffic and alerts you when one goes silent.
check a specific tag
Meta Pixel checker
GA4 tag checker
Google Tag Manager checker
Google Ads conversion tag checker
TikTok Pixel checker
LinkedIn Insight Tag checker
Pinterest Tag checker
Snap Pixel checker
X (Twitter) Pixel checker
Universal Analytics checker
PostHog installation checker
Plausible Analytics checker
Fathom Analytics checker
Hotjar installation checker
Microsoft Clarity checker
Mixpanel installation checker
Segment installation checker
Klaviyo onsite tracking checker
HubSpot tracking code checker