What mira keeps

• mira is a web page, so the computer that serves it — Vercel — sees each visit and keeps a record of it for one day before deleting it: an internet address, roughly where in the world that is, the browser, and which page was asked for. mira's pages are named after its challenges and its certificates, so that record shows which ones were opened, and when. mira itself never reads those records. This browser remembers the language you picked, and tells the server each time.
• The work itself never leaves this device. Your child's name, the blocks they joined together, the answers they got right, and what a certificate says are written in this browser and sent nowhere.
• There is no account. No email, no password, nothing to sign up for.
• The name and picture a child chooses are saved in this browser and nowhere else.
• Progress and certificates are saved the same way.
• mira itself sends nothing anywhere — no analytics, no tracking, no adverts.
• Clearing this browser's data erases all of it. There is no copy anywhere else.
• A profile moves to another device only if you export it to a file yourself.

That is the whole of it.