Plumb
Know what your home really costs.
Calculates your full monthly mortgage payment, including tax, insurance, PMI and HOA, and shows how much extra payments save in interest and time.
Zip, 179 KB. MIT licence. Built 19 Oct 2026.
Live preview
This is the real site, not a mock-up. Click around; the button on it opens the working app.
What you get
Everything a tool needs, already done.
Pages and screens
- Hero
- How it works
- Features
- Mortgage calculator
- Amortization schedule
- Saved properties
Features
- Full monthly payment with tax, insurance, PMI and HOA
- Down payment as amount or percent, kept in sync
- Extra monthly, yearly and one-time payments
- Interest and time saved by paying extra
- Payment breakdown and balance-over-time charts
- Amortization schedule by month or year
Palette
#12211e#56625e#85590f#ffffff#dcd5c8#0f766e
Style
- Warm
- Editorial
- Minimal
For developers
A real codebase, not a page builder export.
Stack
Vite, React 19 and TypeScript for the app. The launch page is plain HTML, CSS and a little JavaScript with no build step. Vitest for unit tests, Playwright for browser tests.
Run it
unzip plumb.zip
cd plumb
npm install
npm run devIn the zip
site/the launch page with the built app insite/app/src/ande2e/the app source and testsdocs/technical-docs/architecture, runbook, quick referenceSTART-HERE.mdandLICENSE(MIT)
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