Lightweight analytics

Web analytics that doesn’t slow down your website

The Overtracking script weighs about 5 KB compressed, loads asynchronously and stays in the browser cache. Google Analytics’ gtag.js weighs about 157 KB.

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About 5 KB, asynchronous

The script doesn’t block the rendering of your page and is served compressed and cached, so repeat visits don’t download it again.

About 5 KB compressed (measured on 3 November 2026)
Asynchronous: it doesn’t block rendering
Cached by the browser and revalidated

Measure your own speed

Overtracking measures the Core Web Vitals of your real visitors, so you can check that your website stays fast.

LCP, INP, CLS, FCP and TTFB
By page, device and country
Good, needs improvement or poor, with Google’s thresholds

Served from your own domain

On paid plans you can serve the script from a subdomain of yours, such as data.yourwebsite.com, so it loads like the rest of your website.

A CNAME record in your DNS
Certificate issued automatically
Blocked much less by ad blockers

Integrations

Frequently asked questions

How much does the script weigh?

About 5 KB compressed. The exact size depends on the goals and heatmaps you have configured.

Does it affect my Core Web Vitals?

It loads asynchronously and doesn’t block rendering. You can check it yourself: Overtracking measures the Core Web Vitals of your real visitors.

Does it work on single-page apps?

Yes. Page changes made through the browser history count as page views, without extra code.

Keep exploring

Start measuring in 5 minutes

Try it free for 7 days. No cookies, no banners, no credit card.

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