Privacy policy
Short version: no accounts, no ads, no tracking cookies. Your calculations stay in your browser.
Effective November 7, 2026.
Calculations
The dates and numbers you enter are calculated by code running in your browser. They are not sent to DayMath. A share link puts the dates in the address you copy, so anyone you send it to can see them.
What is stored on your device
DayMath uses your browser’s local storage, not cookies, to remember a few preferences on your device: your color theme (daymath.theme) and the holiday set, weekend days and start-date option you last used in the calculators (daymath.counter, daymath.adder, daymath.worked, daymath.lead). Saved settings are only restored on calculator pages; pages that state an answer in their text always start from their default settings. This data never leaves your browser. You can clear it at any time in your browser settings.
Analytics
DayMath will use Cloudflare Web Analytics to count page views. It does not use cookies or local storage and does not track you across sites. This policy will be updated when it is switched on.
Hosting
Like every website, DayMath’s hosting provider receives technical information such as your IP address and browser type when it delivers a page. DayMath does not use that information to identify you. Fonts and scripts are served from DayMath itself, with no third-party requests.
Advertising
There are no ads on DayMath today. If ads are added later, this policy will be updated first to describe what the ad provider collects and the choices you have.
Accounts and email
There are no accounts. If you email hello@daymath.app, your message is used only to reply and to fix any problem you report.
Changes
Changes to this policy are posted on this page with a new effective date.