Your data
House Metabolism, Matter Make. Draft, 7 November 2026.
What we keep
Your sign-in is run by Matter Make ID, which keeps your e-mail address and the boxes you ticked when you joined.
When you press Save, this site keeps what you entered for that household: the number of people, the house, cars, trips (the localities you travel between), diet and bins. It's stored with your Matter Make account number, not your e-mail address, on Cloudflare's servers in the EU and elsewhere. Nobody else using the site can see it.
Nothing is kept until you press Save. Trying things out without saving leaves nothing behind.
What we use it for
Only to show your households back to you. We don't share it, sell it or use it for advertising.
Deleting it
Delete one household with its delete button, or everything at once with Delete all my data in the menu. Both are immediate and permanent. To close your Matter Make account itself, e-mail Matter Make.