Privacy

This website has no accounts, no advertising and no cookies. It collects two things.

Visit statistics

To see which pages and versions of the site people use, visits are counted with PostHog, on its EU servers. Nothing is stored on your device (no cookies, no local storage), and you are never identified by name. What is counted: the pages you view and for how long, clicks within the site, how quickly the pages load, the site that sent you here, and your browser and device type. Your IP address may be used to estimate your country and city; the address itself is not kept. If your browser sends "Do Not Track", you are not counted.

Drawings you send (Paint version)

If you press Save and send, your drawing and the name and message you type (both optional) are sent to Lehan. They go through Google Apps Script and are kept in Lehan's Google Drive and email. Just save keeps the drawing on your device only.

Edits you make (Overleaf version)

Not collected. Your edits to the .tex files stay in your browser tab and are not sent anywhere; refreshing the page restores the original.

Questions

To ask about, or to have deleted, anything you sent: lehan.zhang@gess.ethz.ch.

Links to other sites (papers, coauthors, the photography site, the blog) follow those sites' own policies.