Free tool
How heavy is your live chat?
Paste any URL. We fetch the page, find the third-party scripts it declares, and measure what each one weighs. Measured bytes, not vendor claims.
- Free, no signup
- Every script measured the same way
- Shows what it cannot see
Free and no signup. We fetch the page once and measure the scripts it declares.
Why widget weight is worth a look
Support chat is one of the few scripts you deliberately put on every page of your site, including the ones where a visitor is deciding whether to buy. On a phone with a slow connection, a few hundred kilobytes of JavaScript is the difference between a page that feels instant and one that stalls. The widget exists to help people convert, so it should not be the thing that makes them leave.
Weight is not the only thing that matters (async loading and style isolation matter too), but it is the easiest to measure. This tool reads what a page declares. To see what widgets download once they run, read our chat widget weight benchmark, measured in a real browser on each vendor's own site. For the install side, the platform guides cover every stack, and how muro works explains what the widget does once it is on the page.
Questions
Questions about widget weight.
Something else? Write to [email protected], a person answers.
How heavy is a typical live chat widget?
It varies enormously. In our benchmark of 19 chat widgets (ours included), measured on 10 October 2026 in a real browser, each on its maker's own website, the median widget downloaded 512 kB before anyone clicked. The other vendors ranged from 49 kB to 2.0 MB. The honest answer for your site is to measure it, which is what this tool does.
Does a chat widget slow down my website?
It can. Any third-party script costs a DNS lookup, a connection and a download, and if it is not loaded async it can block rendering. The weight matters most on mobile connections and on pages where the visitor is deciding whether to stay. Async loading and a small file keep that cost small.
How does this tool measure the size?
We request the page once, read the third-party script tags in the returned HTML, then download each script and gzip it ourselves. Every script is measured with the same method, including muro’s, so the comparison is fair regardless of how each CDN serves its files.
Why is my real page weight higher than this?
This measures the scripts declared in the HTML. Many tools load a small loader first, which then pulls more code, images, fonts and web sockets at runtime. Those follow-on requests are not counted here, so treat this as the floor rather than the full picture.
How big is the muro widget?
About 9 KB gzipped. It is vanilla JavaScript with no framework runtime, loads async so it never blocks your content, and renders inside a Shadow DOM so it cannot collide with your CSS. It is measured with the same method this tool uses on everything else.
Put muro on your next site.
Live chat for every site you run, hosted in Germany. Free for one site, no card.