Privacy Policy

Last Updated: September 2026

Overview

RentBuy.org is provided by PORTMAN LLC. This Privacy Policy explains how we handle information in our website, mobile applications, MCP endpoint and the calculator panel in ChatGPT and Claude.

Information Collection

Data Stored Locally

The standalone website and mobile applications store calculator inputs (such as home price, rent amount, tax rates, and other financial parameters) locally using browser localStorage (web) or SharedPreferences (mobile). When used without an AI integration, these saved inputs:

• Never leaves your device
• Is not transmitted to any server
• Is not shared with any third party
• Can be cleared by clearing your browser data or uninstalling the mobile app

Data We Do NOT Collect

We do not collect any of the following:

• Personal identification information (name, email, address, phone number)
• Location data or GPS coordinates
• Contact information or address book data
• Financial account information or bank details
• Usage analytics or behavioral tracking data
• Device identifiers (IDFA, GAID, or similar)
• Cookies for tracking purposes
• Any form of user accounts or login credentials

Data Storage

The standalone website and mobile calculators perform calculations on your device. The MCP endpoint processes calculation requests on our server. The calculator panel in ChatGPT and Claude performs interactive calculations within the embedded panel and shares the current scenario with that assistant.

The MCP endpoint

AI assistants can run the calculator through our MCP endpoint. Requests sent to it contain only calculator inputs, are computed in memory and returned; we do not store them and there are no accounts. Our hosting provider may keep standard, short-lived request logs (such as the requesting IP address) for security and rate limiting.

The calculator panel in ChatGPT and Claude

When opened inside ChatGPT or Claude, the calculator receives the scenario inputs supplied by that assistant. While connected, it shares the current inputs, one-time costs and calculated results with the assistant so you can discuss them. Selecting "Explain this scenario" adds an explanation request containing that scenario to your conversation. Where supported, the assistant stores panel state to restore the scenario when you reopen it. This panel does not read the standalone website's saved inputs, and it makes no network requests of its own.

We do not request your identity, conversation history, memory, files, financial account access or login credentials. Do not enter personal details in one-time cost labels. OpenAI's handling of ChatGPT conversations and Anthropic's handling of Claude conversations are governed by their own policies and your settings in each product.

Third-Party Services

Our Services do not integrate with any third-party analytics, advertising, tracking, or data collection services. We do not use:

• Google Analytics or similar analytics platforms
• Facebook Pixel or other advertising trackers
• Any third-party SDKs that collect user data

Children's Privacy

Our Services do not collect any personal information from any users, including children under the age of 13. The applications are safe for users of all ages.

Security

The MCP endpoint uses HTTPS, validates calculator inputs and applies request limits. We do not require financial account information or credentials. Use only hypothetical or necessary financial assumptions and avoid personal details in labels or support requests.

Your Rights

We do not maintain user accounts or store MCP scenario inputs or results. You can manage locally saved calculator data by:

• Web: Clearing your browser's localStorage or site data for rentbuy.org
• Mobile: Uninstalling the app or clearing the app's data through your device settings
• Using the "Reset to Defaults" feature within the application

For calculator information shared in ChatGPT or Claude, use that product's conversation and data controls. Resetting the calculator changes the current scenario; it does not delete earlier messages in a conversation. Information emailed to support is used to respond to your request; contact admin@rentbuy.org about that correspondence.

Changes to This Policy

We may update this Privacy Policy from time to time. Any changes will be reflected in the "Last Updated" date at the top of this page. We encourage you to review this page periodically for any changes.