Credits & Attribution

Last Updated: January 2026

Heatmap Housing is built using a variety of open-source software and data sources. We gratefully acknowledge the following projects and organizations that make our service possible.

Map Data

OpenStreetMap

Map tiles and geographic data are provided by OpenStreetMap contributors. OpenStreetMap is a collaborative project to create a free editable map of the world.

OpenStreetMap Copyright & License

ODbL License

Leaflet

Interactive maps powered by Leaflet, an open-source JavaScript library for mobile-friendly interactive maps.

leafletjs.com

BSD 2-Clause License

Real Estate Data Sources

HUD Fair Market Rents

Fair Market Rent (FMR) data is sourced from the U.S. Department of Housing and Urban Development (HUD). This data is used to estimate rental income potential across different ZIP codes.

HUD FMR Data

Public Domain

U.S. Census Bureau

ZIP Code Tabulation Areas (ZCTAs) and demographic data are derived from U.S. Census Bureau datasets.

Census TIGER/Line Shapefiles

Public Domain

Redfin

Market data including median home prices, days on market, and other real estate metrics are sourced from Redfin's publicly available data center.

Redfin Data Center

Redfin Data License

Realtor.com

Additional market statistics and property data are sourced from Realtor.com's publicly available research and data resources.

Realtor.com Research

Realtor.com Terms

Open Source Libraries

Heatmap Housing uses many open-source libraries. Key dependencies include:

  • Leaflet - Interactive maps (BSD 2-Clause)
  • TopoJSON - Geographic data encoding (ISC License)
  • Chart.js - Data visualization (MIT License)
  • Supabase - Backend infrastructure (Apache 2.0)
  • Vite - Build tooling (MIT License)
  • PapaParse - CSV parsing (MIT License)
  • LZ-String - Data compression (MIT License)
  • Pako - Zlib compression (MIT License)
  • Clusterize.js - Virtual scrolling (MIT License)

Disclaimer

All data provided by Heatmap Housing is for informational purposes only and should not be construed as investment advice, financial advice, or a recommendation to buy or sell any property. Data may be delayed, incomplete, or contain errors. Always conduct your own due diligence and consult with qualified professionals before making any real estate investment decisions.

Heatmap Housing is not affiliated with, endorsed by, or sponsored by any of the data sources listed above. All trademarks and brand names belong to their respective owners.

Contact

If you have questions about attribution or believe we have inadvertently omitted a credit, please contact us at support@heatmaphousing.com.