🔒
100% Local Browser Calculation
Zero data upload. Ever.
All calculations run entirely in your web browser using JavaScript. No property addresses, rent amounts, loan figures, or depreciation data are ever transmitted to any server.
💾 What Data Is Stored in localStorage
RentalInvestCalc uses your browser's localStorage to save your inputs so you don't lose work when you close the tab. This data NEVER leaves your device.
| Data Type | What's Stored | Purpose |
|---|---|---|
| Tab State | Last active calculator tab (tab1–tab8) | Restore your last-used calculator on return visit |
| Input Values | Property price, rent, loan amount, expenses, depreciation inputs | Pre-fill calculator fields so you don't re-enter data |
| Saved Deal Scenarios | Named property scenarios with all inputs and results (Tab 6) | Compare multiple deals side-by-side |
| Theme Preference | "light" or "dark" | Remember your dark mode preference |
Key point: localStorage is sandboxed to your browser and this website's domain only. Other websites cannot access this data. It is not sent to any server, analytics tool, or third party.
🌐 Third-Party Services
Chart.js (CDN Only)
Tab 6 (Saved Deals) loads Chart.js from cdn.jsdelivr.net to render the asset growth chart. This is the only external CDN resource. No data is sent to the CDN — it merely serves the JavaScript library file. You can block this CDN in your browser and the calculator will still work (chart will not render).
No Analytics / No Tracking
RentalInvestCalc does not use Google Analytics, Facebook Pixel, or any other user tracking tools. We do not know who you are, what properties you analyze, or how you use the calculators.
No Cookies
We do not set any tracking cookies. The only storage used is localStorage (described above), which is not a cookie and is not sent with HTTP requests.
👤 Your Rights & Data Control
🗑️
Delete All Data Instantly
Go to Tab 6 ("Saved Deals") and click the "Clear All Data" button. This immediately deletes all localStorage data for this site.
🧹
Browser Cleanup
You can also clear all localStorage data by using your browser's "Clear Site Data" feature (usually found in Developer Tools > Application > Storage, or in browser Settings > Privacy > Clear browsing data).
🚫
No Account Needed
There is no account system, no login, and no signup. We have no way to identify you or associate your data with any identity.
🌍
Offline Use
Once loaded, the calculator works offline (except for Chart.js loading on Tab 6). You can install it as a PWA for full offline access.
📧 Contact
If you have any questions about this Privacy Policy or your data, please contact us:
Email: 18999737@qq.com
We aim to respond to privacy inquiries within 7 business days.
Effective Date: June 1, 2026
Last Updated: June 1, 2026
Last Updated: June 1, 2026