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Propwise – Real Estate Risk Analysis Chrome Extension

Propwise – Real Estate Risk Analysis Chrome Extension

August 26, 2025

Hey there! I’m excited to share one of my recent side projects: Propwise, a Chrome extension for real estate risk analysis.

Propwise brings investment insights directly into Zillow and Redfin listings — crime rates, demographics, rental potential, and financial viability — all in one place, without leaving the property page.

👉 Live here: Propwise Extension (coming very soon)
👨‍💻 Source code: GitHub Repository

🏗️ Key Features

  • Property Data Scraping
    Automatically pulls address, price, square footage, and other property details from Zillow/Redfin listings.

  • Crime Risk Analysis
    Displays risk indicators (Low/Medium/High) and a crime index score (0–50 scale).

  • Demographics (0.5 mile radius)
    Ethnicity breakdown with interactive charts powered by Census data.

  • Price & Market Analysis
    Price vs. median area value, histograms of local price ranges, and market positioning.

  • Income & Rent Insights
    Median household income, whole-property rent estimates, and room-by-room rental viability.

  • Investment Metrics Calculator
    Enter monthly expenses to instantly calculate:

    • Cap Rate
    • Cash Flow
    • ROI

🛠️ Tech Stack

  • Frontend: HTML, CSS, JavaScript
  • Browser Integration: Chrome Extension API (Manifest V3)
  • Data Sources: Zillow/Redfin (scraped), Census Bureau, Crime APIs, Rentometer (currently using dummy data during development)
  • Visualization: Chart.js for charts and interactive analysis

🧩 Challenges & Highlights

🕵️‍♂️ Handling Real Estate Data

Real estate data is fragmented and inconsistent. I built processing pipelines with fallback mechanisms to standardize property details, ensuring accurate analysis.

⚙️ Extension Development

Developing a Chrome extension meant coordinating multiple layers: the popup UI, content scripts for scraping, API integrations, and a smooth UX.

⚡ Making Analysis Accessible

The biggest focus was usability — delivering complex data as clear, actionable insights through instant analysis and visual breakdowns.

📖 Usage Guide

  1. Navigate to a property listing on Zillow or Redfin.
  2. Click the Propwise extension icon in Chrome.
  3. Instantly view property details, crime data, demographics, rent estimates, and investment metrics.
  4. Enter monthly expenses into the calculator to see cash flow, ROI, and cap rate.

📝 License

This project is licensed under the MIT License — see the LICENSE file for details.

Thanks for checking out Propwise! This project combines my interests in data analysis, visualization, and real estate into a tool designed to make investment decisions faster and more informed. Whether you’re a developer, investor, or just curious, I’d love feedback.

— Connor