Don’t worry, not in this case! Generally speaking, cookies first collect data on the client and then send it over to the server. But in our case, there is no server (backend) - it’s just a client-side Next.js application sent over to the client (your browser), and the local storage that stores progress and preferences data in the app just lives locally and never actually leaves the browser! We (well, me) have no idea what progress data our users have, because nothing is sent over from the app (you can see for yourself by checking your browser’s Network tab!)

Hahaha, finally someone noticed

We’re using local storage that lives in your browser instance and doesn’t sync between devices, so no cookies involved! ^^