Who operates this site
Plain & Penny is operated by Dot Interactive Limited, Hong Kong. Contact bd@dotinteractive.cc about privacy questions or requests.
Calculator inputs
Our calculators process amounts in your browser. The site’s calculator code does not send inputs to our server, store them in browser storage, or share them with advertising services. Refreshing the page resets the inputs. Do not enter confidential account details.
Search and technical information
Site search uses a downloadable index and matches guides in your browser. Search words appear in the page URL and may be included in browser history and hosting access logs. Do not put personal or confidential information in a search.
The hosting and delivery services that serve this website may process technical information such as IP address, requested URL, time, browser information and error or security records. This is separate from the calculator code. This site is hosted through OpenAI Sites and its delivery infrastructure; provider practices are described in OpenAI’s privacy policy. We do not control every provider retention period.
Email correspondence
If you email us, your address, message and attachments are processed by our email service and by us to respond, address corrections and manage relevant correspondence. We retain correspondence while needed for that purpose and any applicable recordkeeping obligations. Avoid sending sensitive financial or identity information.
Cookies, advertising and analytics
This launch edition adds no analytics script, advertising script, tracking pixel, marketing cookie, or browser-storage identifier. The site contains no live Google ads. Hosting, access or security services may use their own necessary technologies; we do not claim that the entire delivery infrastructure is cookie-free.
RSOC review pages are labeled layout mockups with no ad requests. If advertising or analytics is introduced, this notice and any required consent controls will be updated before activation. A policy describing possible future ads does not constitute consent to them.
External websites
Links lead to independent sources whose privacy practices apply after you visit them. We use a strict-origin-when-cross-origin referrer policy so external links do not ordinarily receive the full internal page path or search query.
Choices and requests
You can manage browser history and cookies through your browser. Contact us to request access to, correction of, or deletion of personal information you have provided by email, or to raise a privacy concern. Applicable rights depend on your location and the information involved; we assess requests under relevant law. We do not sell personal information or operate cross-site targeted advertising in this edition.
Children and international processing
This publication is intended for a general adult audience and does not knowingly solicit personal information from children under 13. Our publisher is in Hong Kong and service providers may process information in other countries. Contact us if you believe a child has provided personal information.
Policy changes
Material changes will be reflected here with a new effective date. This version describes the implementation published on October 29, 2026.