Privacy policy
This policy explains what SheetModel collects, what stays on your device, and how advertising works on this site. The short version: your calculator inputs never leave your browser, we do not require an account, and the only third-party data collection is standard advertising and analytics.
Information you enter into a calculator
All calculations run in your browser. Purchase prices, rents, supplier costs and every other input stay on your device. They are stored in your browser’s localStorage so that returning to a page restores your previous numbers, and they are never transmitted to our servers. Clearing your browser storage removes them permanently.
Excel workbooks are generated locally using the SheetJS library. Nothing is uploaded, and no file is created on a server — the download is assembled in memory and handed directly to your browser.
Information we collect automatically
- Standard server logs: IP address, user agent, requested URL and timestamp, retained for security and abuse prevention.
- Aggregate analytics: page views, referrers, approximate geography and device type — used to understand which models are useful.
- Advertising identifiers: set by our advertising partners, as described below.
Advertising
This site is supported by display advertising. Ad partners may use cookies, web beacons and similar technologies to serve ads based on your prior visits to this and other websites. This is standard interest-based advertising.
- You can opt out of personalised advertising through your Google Ads settings and the Digital Advertising Alliance opt-out tools.
- You can block or delete cookies in your browser settings without losing access to any calculator or download.
- Every ad slot on this site uses a fixed-size container; no ad can shift the content you are reading.
We do not sell personal information, and we do not pass calculator inputs to advertisers. Advertisers receive impression and click data only.
Cookies
- Essential: none required. The site works with all cookies blocked.
- Preference: browser storage remembers your calculator inputs locally.
- Analytics and advertising: set by third parties, subject to their own policies.
Your rights
Depending on where you live, you may have the right to access, correct, delete or port personal data, and to object to certain processing. Because we do not maintain accounts or store calculator inputs, most requests relate to advertising identifiers held by third parties. Write to [email protected] and we will help route the request.
Children
This site is intended for adults operating businesses and investments. It is not directed at children under 16, and we do not knowingly collect their personal information.
Data retention and security
Server logs are retained for a maximum of 90 days. The site is served over HTTPS with standard security headers. Because no user data is stored server-side, there is no user database to breach.
Changes to this policy
Material changes will be posted on this page with an updated date. Continued use of the site after a change constitutes acceptance of the revised policy.
Contact
Privacy questions: [email protected]. See also our terms of service and editorial guidelines.