Privacy Policy

Your Data Never Leaves Your Browser

• All CPAP data processing happens entirely in your browser using JavaScript.
• Your sleep therapy data (EDF files from your SD card) is never uploaded to any server.
• Data is stored locally in your browser's IndexedDB. Clearing browser data removes it.
• No user accounts. No login. No server-side database stores your health information.

What We Do Collect

• First-party usage analytics: anonymous product events (for example, that an import succeeded or a report was generated) sent to our own database so we can find and fix problems. Identified only by a random session ID kept in your browser's sessionStorage, which disappears when you close the tab. Each event also records the country your connection comes from, your browser and device type, and the page that referred you. No cookies, no account, and no number read from your CPAP, oximeter or wearable files. You can turn these off under Your Privacy Choices below. The tools record their outcome only in coarse form: the range a result fell in, such as whether an AHI was under or above the 5.0 mark (including one read from nights you imported) or which band a questionnaire score falls in, but never the AHI or the score itself; which fixed options you picked, such as the problems you chose in the CPAP Troubleshooter or the machine and battery in the battery calculator; and a few counts a tool works out, such as how many problems you picked or how many sleep cycles it suggested. On the tools page itself, we record which answers you picked in the “Which tool do I need?” guide and which tool or link you followed from the page. If you answer “Was this article helpful?” at the end of an article, we record which article and your yes or no, and nothing else. When you search the articles or pick a topic, we record what you typed or picked and how many results it found. The search box at the top of the site records a search only when it found nothing. This shows us what readers look for and cannot find yet, so we can write it. Email addresses, dates, and any number four or more digits long are removed in your browser before the search is sent, and again when it arrives.
• Standard web server logs via Vercel: IP address, browser type, pages requested. These are used for security and performance monitoring. No health data.

Your Privacy Choices

You can turn off our usage analytics in this browser below. If your browser sends a Global Privacy Control signal, they are already off unless you turn them on here.

To remove everything CPAP Clarity has saved in this browser, use Delete everything in this browser. It is worth doing on a shared computer.

No Affiliate Links

CPAP Clarity has no affiliate links. Links to other websites are plain references: they carry no tracking tags, and I earn nothing when you click them or buy anything afterward. Once you leave the site, the destination's own privacy policy applies.

Advertising

CPAP Clarity runs no display advertising. No ad-network or ad-audience script is loaded on any page, and none will be (decided 2026-07-20). No advertising cookies are set and no advertising audience is built from your visit.

The site loads no third-party analytics or tracking script. Until November 2026 it used Google Analytics, which saw the pages you visited; that was removed, and no CPAP data was ever part of it.

Cookies

The site sets no cookies for visitors. Your analytics choice is kept in your browser (localStorage) under the key cpapclarity-consent.

Third-Party Services

• Vercel (hosting): vercel.com/legal/privacy-policy

Children's Privacy

CPAP Clarity is not intended for use by anyone under 18.

Changes

We may update this policy. Changes will be posted on this page with an updated date.

Contact

For privacy questions or data requests, contact us at hello@cpapclarity.com

Last updated: November 2, 2026