Privacy
Short version: what you type into a calculator never leaves your browser, and we do not use cookies to follow you.
The important one
Your financial inputs never reach us
Every calculator on Frank Numbers runs entirely in your browser. Your salary, your mortgage balance, your card debt, your contributions: all of it is computed on your own device and none of it is transmitted, logged or stored. There is no form submission, no API call carrying your figures, and no server-side record to subpoena, leak or sell.
What we do collect
Anonymous usage analytics
We record how the site is used so we know which calculators are worth improving. For each visit that means: the pages you viewed and roughly how long you spent on them, which links and buttons were clicked, the site that referred you, and your approximate country, device type and browser as reported by your browser and network.
We do not record your name, email, IP address, precise location, or anything you entered into a calculator.
Why there is no cookie banner
Visitors are counted without cookies
Instead of storing an identifier on your device, we derive a one-way hash from your IP address, your browser’s user-agent string, today’s date and a secret that only we hold. That hash lets us tell two simultaneous visitors apart without ever storing the ingredients. Your IP address is used to compute it and then discarded, never written to the database.
Because the date is part of the hash, the value changes every midnight. That is deliberate: it means we cannot follow you from one day to the next, and it also means our “unique visitors” number counts each person once per day rather than once ever. We would rather have a slightly blunter statistic than a tracking profile.
Since nothing is stored on your device and no personal data is retained, there is no consent banner to click.
Housekeeping
Storage and sharing
Analytics are stored in our own PostgreSQL database. They are not shared with, sold to, or brokered through any third party, and there are no advertising, social or third-party analytics scripts anywhere on this site.
Your browser’s local storage holds two preferences: your light or dark theme choice and which country you last viewed. Those stay on your device and are never sent to us. Clearing your browser data removes them.
If analytics fail for any reason, the calculators carry on working normally. Nothing on this site depends on tracking you.