Your numbers stay in your browser.
Last updated: October 29, 2026
What we do not collect
All SellerMath calculators run entirely in your browser using JavaScript. Values you type into a calculator — prices, costs, order volumes, margins — are never transmitted to our servers, stored, logged or shared. There are no user accounts and no sign-up forms.
Server logs
Like almost every website, our hosting infrastructure records standard technical logs when pages are delivered (IP address, requested URL, timestamp, user agent). These logs are used only to operate and secure the site and are not linked to any calculator input.
Cookies and analytics
The site does not currently use analytics trackers or advertising cookies. If advertising is introduced in the future, this policy will be updated to describe the provider, the cookies involved and your choices, including any consent mechanism required in your region.
If you contact us by email, we use your address and message only to respond and to maintain the site (for example, correcting a fee rate you reported). We do not add you to a mailing list and we do not share your address with third parties.
Data rights
Because calculator inputs never leave your device, there is no personal calculation data for us to access, export or delete. For questions about server logs or email correspondence, contact privacy@kindus.cn.