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Nothing. There is no account, no sign-up form, and no analytics. We never see your name, your email, or which sheets you print.
Your favourites and collections are saved in this browser's own storage, on this device. They are not uploaded anywhere, which also means they will not follow you to a different device or browser. Clearing your browser data clears them.
There are none. This page loads no external scripts, fonts, images, or ad networks — the font is built into the page itself. A Content Security Policy blocks any outside connection, so nothing can be added quietly later.
Sheets come from two places: a set drawn in-house, and a printable library collected from ABCmouse. Both are stored on this device and served from it — opening or printing one fetches nothing from the internet. There are no comment fields, no uploads, no chat, and no links out to other websites, so there is nothing here for a child to stumble into.