Privacy

Last updated 2026-09-08. Applies to the app at expono.app and this site.

expono runs entirely in your browser. There is no account, no sign-in, and no expono server that your diagrams pass through. This page says what that leaves.

Your files

A project is a file on your disk. Opening, editing and saving it happen in your browser, and nothing in it is sent anywhere. The same is true of images you insert and of anything you import from another tool.

What the app keeps in your browser

So that it works next time and works offline, expono stores a few things in the browser's own storage for expono.app, on your device only:

• Your preferences — panel layout, appearance, and similar settings.
• Your shape library — which packs are loaded, and any pack file you imported.
• A recovery copy of the open document, so an unsaved diagram survives a closed tab or a crash. This copy contains your diagram's content. It is replaced as you work and offered back to you on your next visit.
• The app itself, cached so it opens with no network.

None of this leaves your device. To remove all of it, clear your browser's site data for expono.app.

What is sent, and to whom

• Loading the app or this site. Both are static files served by Cloudflare Pages. Like any web host, Cloudflare's servers see the connection: your IP address, your browser's identification string, and the address requested. Cloudflare keeps such logs under its own privacy policy. We do not add analytics, tracking, or cookies of our own, and we see no per-visitor data.
• Nothing else. The app's security policy forbids it from contacting any address but its own. Fonts, icons and notices are bundled with it. This version contains no AI feature and makes no request to any third party.

If you write to us

Help → Report a bug… composes an email in your own mail app, addressed to supportexpono.app, containing the version you are running, your browser, the window size, and whether the page was served offline. It contains nothing from your document, and you see the whole text before you send it. An email you send us is kept for as long as it takes to deal with it, and deleted on request.

Permissions

Insert → Screenshot… asks your browser for permission to capture a window or screen, for that one capture, and the image goes into your document like any other. The app asks for no other permission. Recording a narrated talk is not part of this version; when it is, the audio will stay on your device.

Who is responsible

expono is made by Code Supply, LLC. For anything about this page, or to have an email you sent us deleted, write to privacyexpono.app. Since we hold no personal data beyond email you choose to send, that is the whole of your data with us.

Changes

If what the app stores or sends changes, this page changes with it, and the date at the top moves.