Privacy Policy

What the tool stores

When you place a marker, choose a pain type or depth, write a note, or change a setting, the values are written to your browser's localStorage under a site-specific key. This is what lets the page remember your chart when you come back. That data lives on your device, in that browser profile. It is not transmitted to us.

What is stored locally: marker positions, depth and intensity values, pain type, marker style, optional notes, view/model preferences, and export preferences. No name, email, date of birth, medical record number or contact detail is requested or stored.

How to delete it

• Use the Erase saved data control on the main page, or Clear all to remove markers.
• Or clear site data for headachemap.cc in your browser's privacy settings. Clearing browser data generally removes local storage too.
• Using a private/incognito window means the data is discarded when the window closes.

What is not collected

• No account and no sign-up. There is nothing to log into.
• No uploads. The site contains only static files and browser-side JavaScript. There is no form handler, API endpoint or database that receives your entries.
• No cookies. The site does not set cookies for authentication, tracking or preferences.
• No analytics, ad pixels or fingerprinting. No Google Analytics, no advertising network, no session replay, no third-party font or CDN request.
• No third-party trackers. three.js, the head models, textures and fonts are served from this domain, not from a CDN.

Exported images and copied text

The PNG you export is composed locally with your browser's canvas API and downloaded directly to your device. The Copy summary button writes plain text to your clipboard. Neither action sends data anywhere. Once a PNG is on your device, it is your file: sharing, printing or deleting it is your choice, and we have no copy of it.

What the hosting provider may log

The site is hosted on Cloudflare Pages. Like virtually every web host, Cloudflare may process standard network information to deliver the pages — for example your IP address, requested URL, user agent, referrer, and timestamps — and may retain short-lived access logs for security and operations. This is normal request-level data, not your headache entries, and it is governed by Cloudflare's privacy policy. We do not add analytics on top of it.

External links

The Sources and About pages link to external organisations (NHS, WHO, ICHD-3, National Headache Foundation, American Migraine Foundation) and to three.js. Following those links takes you to a third-party site with its own privacy practices; their policies apply once you leave this site.

Children

Headache Map is general educational material and is not directed at children under 13. It does not knowingly collect personal information from anyone. A parent or guardian should be involved when a child describes symptoms to a clinician.

Health information

Because a headache chart can feel personal, we want to be explicit: the content of your chart never leaves your device through this site. However, a browser, device, or network you do not control (for example a shared or managed computer) may keep its own history or cache. If that matters to you, use a private window on a device you trust, and delete exported files when no longer needed.

Changes to this policy

If the site's data practices change, this page will be updated and the date above will change. We will not start collecting entries or adding trackers without saying so here first.

About this site

Headache Map is an independent, non-commercial project by Jerry Zhang. See the About page for authorship, editorial policy, sources and clinical review status.