Privacy
Last updated 14 November 2026. This is a plain description of what this site and its newsletter do with your information.
This website (nonxerosum.studio)
It has no analytics, advertising or tracking scripts. Your browser keeps a few things on your own device and none of them is sent to us: your light or dark theme choice, your display settings, a short note of what the homepage showed on your last visit (so it can say what changed), and a flag that the intro has played. Clearing your browser’s site data removes them.
The newsletter (read.nonxerosum.studio)
If you subscribe, we hold your email address and your subscription status. Free sign-ups need only an email address. Paid memberships are handled by Stripe, which keeps your card details; we never see them. Emails are sent through Resend, which receives your address for that purpose only. The reading site loads fonts from Google Fonts and its sign-in, search and payment components from Ghost, jsDelivr and Stripe, and those providers see your IP address when it loads.
What we do not do
We do not sell your information, share it for advertising, or combine it with other sources.
Your choices
You can unsubscribe from any email with the link in its footer, and you can ask us to delete your data or send you a copy of it by writing to Bernard@NonXeroSum.studio.
Who is responsible for your information
Non Xero Sum Studio, based in the United Kingdom, is responsible for the information described here. Contact: Bernard@NonXeroSum.studio.
Why we hold it
We hold your email address to send you the newsletter you asked for (your consent, which you can withdraw at any time by unsubscribing), and, if you pay, to provide the subscription you bought and to keep the records the law requires (contract and legal obligation).
Other providers who process it
Besides Stripe, Resend, Ghost, jsDelivr and Google Fonts named above: this site and the reading site are hosted on Fly.io, which handles every request and so sees your IP address; and some earlier paid subscriptions are billed through Substack, which holds the details of those subscribers.
How long we keep it
As long as you are subscribed. If you unsubscribe or ask us to delete your data, we remove it within 30 days, except payment records, which we keep for six years because UK tax law requires it.
Your rights
You can ask to see, correct, delete or move your information, or object to how we use it, by writing to Bernard@NonXeroSum.studio.