Privacy notice

Your calculations stay in your browser.

Last updated: October 3, 2026. This notice describes the current PocketMath website, operated by FMFM Stars / Fumiya Kobayashi in Japan.

Calculator entries and results

PocketMath performs calculations locally in your browser. Its calculator code does not send entered amounts, percentage rates, group sizes, or results to a server. It does not save them in a database or use cookies, localStorage, or sessionStorage to retain them. There is no account or login system.

Entries can remain visible while the page is open. Your own browser may also restore form contents when you return to a page. Browser features, extensions, and shared-device access are outside PocketMath’s control.

Website delivery and technical information

Cloudflare hosts this website. Loading a page necessarily sends a request to the hosting service, which may process technical information such as an IP address, browser information, requested path, and request time to deliver and protect the site. This is separate from calculator inputs, which PocketMath does not include in its requests.

PocketMath does not include a third-party analytics script in this version. This statement does not mean that the hosting provider receives no technical request data.

Advertising ownership verification

The current site does not load advertising scripts or display ad placements. An AdSense publisher meta tag and the public ads.txt file identify the site’s publisher for ownership verification. These static text declarations do not themselves run advertising code or set advertising cookies. We will update this notice and the relevant site controls if advertising is introduced.

Email you choose to send

The contact links open your email application. If you send a message to fmfm.stars@gmail.com, its address, contents, and any attachments are handled through email to respond to or investigate your request. They are not calculator submissions. Please avoid sending card numbers, passwords, bank details, or other sensitive information.

Contact messages may be retained while responding to an inquiry and following up on a reported issue. You can use the same address to ask about your message or request its deletion; any limitations that apply to a particular request will be explained in the response.

Questions and updates

For privacy questions, email fmfm.stars@gmail.com. Changes to how the site works will be reflected here, with the update date shown above.