Last updated: July 2026
This page explains what we store in your browser and why. We have tried to write it in plain English rather than the usual wall of legalese.
These are required for the site to work at all. You cannot turn them off without breaking sign-in.
We use these to understand which lessons people finish and which ones they abandon. They tell us what to fix. We do not sell this data, and we do not use it to build advertising profiles.
Sentry captures errors when something breaks, along with enough technical context to reproduce it. This is how we find out the site is broken before you have to tell us.
Every major browser lets you block or delete cookies from its settings. Blocking the strictly necessary ones will stop you from being able to sign in, so your progress will not save. Blocking analytics and error tracking has no effect on the lessons themselves.
You can also turn on Do Not Track or Global Privacy Control in your browser, and we honour it for analytics.
If anything here is unclear, email [email protected].