The Copilot Stack is a static website. Pages are pre-rendered HTML served as files. There is no application server, no database and no user account system, which removes most of the ways a site would ordinarily collect information about you.
What is stored in your browser
Two features write to your browser's localStorage. Both are optional, and neither transmits anything:
| Feature | Key | What it holds |
|---|---|---|
| Lesson progress | tcs:progress:cluster-N | A list of lesson numbers you marked complete |
| Lesson feedback | tcs:feedback:/path/ | Whether you clicked "Yes" or "No" on a specific lesson |
This data stays on the device that created it. It is not sent to us, not synced between devices, and not shared with anyone. It is also why your progress will not follow you to another browser.
To remove it, clear site data for this domain in your browser settings, or un-mark the lessons individually — the completion control toggles both ways.
Feedback buttons
The "Was this lesson helpful?" control records your answer locally and nothing more. Because nothing is transmitted, clicking it does not tell us anything. We say so on the control itself rather than implying your response reaches an editor. If you want to report a problem with a lesson, thecorrections process is the route that actually works.
Analytics and tracking
This site ships no analytics scripts, no advertising tags, no third-party trackers, no social media pixels and no fingerprinting. We do not set cookies.
Third-party requests
Pages load their own assets — HTML, CSS, JavaScript, fonts and the Pagefind search index — from this domain. Web fonts are self-hosted rather than fetched from a font CDN, so rendering a page does not disclose your visit to a third party.
Lessons link out to external documentation, mostly GitHub's. Following such a link takes you to a site with its own privacy practices, over which we have no control.
Server logs
Whoever hosts this site may keep standard access logs — IP address, timestamp, requested URL, user agent — as a normal part of operating a web server. We do not use that data to build profiles or to identify individual readers.
Children
This site is aimed at software developers and engineering teams. It is not directed at children and does not knowingly collect information from them.
Changes
If this policy changes materially, the "Last updated" date above will change with it. Since the site collects nothing, most future changes are likely to be clarifications rather than expansions of data collection.