This tool doesn't collect anything. There's no server, no account, no analytics, and no tracking. Files you drop in never leave your device.
Load/Watt runs entirely in your browser using client-side JavaScript. When you drop in an .html file, it's read and instrumented locally on your device — it's never uploaded, transmitted, or stored anywhere by this site. Performance data (frame timing, long tasks, memory use, and so on) is measured live in your tab and kept only in memory; closing or reloading the page clears it.
If you choose to profile a public GitHub repo instead of a local file, your browser makes direct requests to the GitHub API (api.github.com) and the jsDelivr CDN (cdn.jsdelivr.net) to fetch that repo's files. Those requests go straight from your browser to GitHub/jsDelivr — this site doesn't proxy, see, or store them. That traffic is governed by GitHub's privacy statement and jsDelivr's own policies, not by me. This only happens if you type a repo into the loader; it's never automatic.
The "custom process" field runs the JavaScript you type directly in your own browser tab, using new Function(). That code never leaves your device either.
The "Export report" button generates a JSON file locally in your browser and saves it to your device. It isn't sent anywhere by this site.
I don't operate any backend, database, or analytics service for this site, and I don't collect names, emails, IP addresses, or usage data.
This site doesn't set cookies and doesn't use browser storage to save anything about you, your files, or your sessions. All state lives in memory for as long as the tab is open.
This site is hosted on GitHub Pages. GitHub may log basic server access information (like IP address and request time) as part of operating its hosting infrastructure; that's governed by GitHub's own privacy statement, not by me.
This page loads fonts from Google Fonts, which may see the request as part of serving them. No other third-party resources are loaded unless you explicitly use the GitHub repo loader described above.
This tool doesn't knowingly collect information from anyone, including children, since it doesn't collect information at all.
If anything about how this tool works ever changes in a way that affects privacy, this page will be updated and the date above will change.
Questions can be raised as an issue on GitHub.