Privacy

What this site keeps, and what it does not.

• No accounts, no email addresses, no analytics, no ads. Pages load nothing from other companies' servers.
• Your marks on a card and the calls on a caller's screen are saved only in your own browser (local storage), so they survive a reload. We never receive them. “Start over” and “Clear every call” remove them.
• Printed sets are stored with the choices that rebuild them: deck, size, number of cards, layout, the checklist option, your optional heading and your own squares, plus the dates the set was made and last opened. Anyone with a set's link can see it, so please do not type full names of children or anything private. Sets nobody opens for 180 days are deleted automatically.
• Network addresses. To stop abuse, the print form counts sets per connection. The count is kept against a salted, one-way hash of the address, never the address itself, and these counts are deleted after two days. The hosting server keeps standard access logs.
• Cookies. The print form sets one security cookie that protects the form from forged posts. No other cookies are set.
• Payments. There is no checkout during preview. When it opens, payments will be handled by PayPal; this site will not see card numbers.