Free DoorVault embed widgets

Three calculators every real estate blog can drop into a post. Copy paste, no signup, free forever.

Fair Market Rent lookup

ZIP input shows 0BR through 4BR FMR plus payment standard. Powered by HUD FY2026 data.

Live preview

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<div id="dv-fmr-lookup"></div> <script src="https://app.doorvault.app/static/embed/v1/fmr-lookup.js" defer></script>

Cap rate calculator

Purchase price, rent, expenses. Color coded verdict. Links to the full DoorVault tool.

Live preview

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<div id="dv-cap-rate"></div> <script src="https://app.doorvault.app/static/embed/v1/cap-rate.js" defer></script>

BRRR quick check

Purchase, rehab, ARV, rent, expenses. IDEAL Scoring v2.0 verdict in real time.

Live preview

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<div id="dv-brrr"></div> <script src="https://app.doorvault.app/static/embed/v1/brrr-quick-check.js" defer></script>

FAQ

Are these really free?
Yes. No signup, no API key, no usage cap on the calculators. Built for the real estate community.
Can I customize the colors?
Each widget supports a light or dark theme via data-theme="dark" on the host div. More options ship in v2.
Does the FMR lookup use HUD data?
Yes. HUD FY2026 Final Fair Market Rents, refreshed quarterly when HUD republishes.
How do I report a bug?
Email [email protected] or file a public issue at the DoorVault repository.