Privacy Policy

Effect Curve — web app and Chrome extension. Last updated 4 August 2026.

What you enter

The substances, doses and times you enter exist only in your browser tab's memory. They are never sent over the network and never written to disk. Closing or reloading the tab discards them — which is also why the app cannot show you yesterday's chart. The curve is calculated entirely inside your browser.

The one network request

When you search for a substance, the app queries a read-only Supabase database for that substance's published parameters — peak time, half-life, and so on. The search term you type is part of that request.

Like any web request, it carries your IP address, and Supabase may retain it in ordinary server logs. See Supabase's privacy policy. Your doses and times are not part of this request — the database is only ever asked about the substance, never about you.

Local storage

• Chrome extension: nothing is stored. It talks to the database over plain fetch and uses no storage APIs at all.
• Web version: the Supabase client library writes one anonymous key to localStorage (named sb-…-auth-token). It is created by the library's session handling even though the app has no login, contains no personal information, and is never read by us. Clearing site data removes it.

Third parties

• Supabase — hosts the substance database. Receives your search terms and IP address.
• esm.sh — a CDN the web version only loads the Supabase client library from, which means that CDN sees your IP. The Chrome extension does not contact it: Manifest V3 forbids remotely-hosted code, so the extension uses a built-in path instead.

No data is sold, shared, or used for advertising. There is nothing collected to sell.

Chrome extension permissions

The extension requests one permission, sidePanel, which lets it draw in Chrome's side panel. It does not request access to the pages you visit, your browsing history, your tabs, or your bookmarks. It cannot read the page you are looking at.

Children

Effect Curve is not directed at children under 13 and collects no data from anyone.

Changes

If this policy changes, the date above changes with it, and the history is public in the project's Git repository.

Not medical advice

Effect Curve draws illustrative estimates from published population figures. It is not a dosing tool, not a clinical tool, and not a substitute for advice from a qualified professional. Do not use it to make decisions about medication.

Contact

Questions about this policy: george.tsertsvadze97@gmail.com, or open an issue at github.com/Open-Fitness/effect-curve.