Last updated: 28 July 2026
The numbers you type into the calculators never leave your device. There is no account, no tracking of individuals, and no selling of data. The longer version below explains exactly what does happen, including the third parties involved.
Every calculation runs in your browser using JavaScript. Your balance, expected return, and monthly withdrawal are never transmitted to any server and are never stored. Close the tab and they are gone.
Two small preferences are saved in your browser's local storage so the site remembers them between visits:
runway-currency — the currency you selectedrunway-theme — whether you chose the light or dark themeThese stay on your device, are not sent anywhere, and are not used to identify you. Clearing your browser data removes them.
The site also reads your device's timezone once, in the browser, to pick a sensible default currency. That reading is not recorded or transmitted.
Typefaces are loaded from Google's font servers. Because your browser requests those files directly, Google receives your IP address and basic request information. See the Google Privacy Policy.
This site displays advertising to cover its running costs. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this or other websites. Google's use of advertising cookies enables it and its partners to serve ads based on your visits to this site and other sites on the internet.
You can opt out of personalised advertising by visiting Google Ads Settings, or opt out of third-party vendor cookies at aboutads.info.
If you use the contact form, your name, email address, and message are processed by a third-party form provider in order to deliver the message. That data is used only to reply to you. It is not added to a mailing list, and it is not sold or shared with anyone else.
The site is served as static files by a hosting provider that keeps standard server logs, which may include IP addresses, for security and abuse prevention. Those logs are not used to build profiles of visitors.
No individual-level analytics or behavioural tracking scripts are installed. If aggregate traffic measurement is added in future, this policy will be updated first.
This site is not directed at children under 13 and does not knowingly collect data from them.
Since no personal data is collected beyond what you voluntarily send via the contact form, there is little to request. If you have contacted me and want that message and your email address deleted, ask and it will be removed.
Any material change to this policy will be reflected here with an updated date at the top of the page.
Ask through the contact form.