Is your tracking working? Prove it in one panel.
See every GA4, Google Ads, Meta and TikTok event, spot server-side GTM and catch consent leaks, right inside Chrome DevTools.
Most tracking bugs are silent.
The budget keeps spending on numbers that are wrong.
Events without values
The pixel fires, the dashboard looks fine, and the ad platform never learns what a cart was worth.
Pixels that ignore consent
A visitor clicks "Reject all" and a pixel fires anyway. Nobody notices until a regulator or a client does.
Sales credited to the wrong source
A payment page on another domain drops the click ID, and paid traffic shows up as a referral.
Five views. One question: can you trust the numbers?
Every event, every parameter, every platform side by side.
Hitline reads the requests GA4, Google Ads, Meta and TikTok send, plus every dataLayer push.
- One click, all platforms on the same row
- Every parameter decoded, no query strings to read
- Missing values flagged the moment they happen
Know if a site runs server-side GTM, with the proof.
Most tools miss requests that go to a site's own subdomain. Hitline checks four signals and lists every GTM tag with its status.
- Four independent signals, not a guess
- Every tag with type, trigger and status
- See which platforms still send from the browser
Click "Reject all" and see who keeps firing.
Hitline reads Consent Mode v2 signals and splits requests into before and after the visitor's choice.
- Default and updated signals side by side
- Leaks marked in red, with the GTM fix next to them
- Cookieless pings told apart from real hits
Follow UTM and gclid page by page.
See exactly where campaign parameters get lost, from the ad click to the order confirmation.
- UTM, gclid and fbclid tracked across pages
- Cross-domain breaks found automatically
- The GA4 setting that fixes it, named
Your plan against what the site really sends.
Load your plan as CSV. Hitline flags missing events and wrong parameters as you click through.
- CSV or JSON, three columns
- Missing events and wrong parameters, live
- No plan yet? Draft one from your session
Three steps, no setup.
Add Hitline to Chrome
Free from the Chrome Web Store. No account to create.
Open a site, click the icon
The popup shows platforms, server-side status and the top issues.
Press F12 for the full picture
The Hitline tab in DevTools records every event live as you browse.
Found something broken? Get it fixed by the person who built Hitline.
One click turns the findings into a prioritized report. Send it to a developer, or send it to me: I set up GA4, server-side GTM, Consent Mode and ad pixels for growing brands.
Your data never leaves your browser.
No server
All analysis runs inside Chrome. Hitline makes no requests of its own.
Minimal permissions
DevTools panel, active tab and local storage. No access to all your sites.
No analytics inside
The extension doesn't track you. Results disappear when you close the tab.
Open source
Read the code and check every claim on this page for yourself.
Is Hitline really free?
Yes. There is no paid plan, no account and no usage limit.
Does it send my data anywhere?
No. Everything is analyzed in your browser. Only your settings are saved, and only on your computer.
How does it detect server-side GTM?
It checks where GA4 requests go, the request path, the server_container_url setting and cookies set by the server.
How is it different from Tag Assistant?
Tag Assistant focuses on Google tags. Hitline shows Google, Meta and TikTok side by side, checks consent and attribution, and compares events with your tracking plan.
Do I need DevTools open?
The popup works without it. For the live event stream, open DevTools before the page loads, or reload once.