Mortgage Affordability Calculator - Know if you can afford it before you apply — single file

A comprehensive mortgage calculator with DTI analysis, PMI logic, payment breakdown, qualification status, and what-if scenarios. Built as a single HTML file with no frameworks, no tracking, and no data collection. Dark/light theme, fully mobile responsive. Open source on GitHub

Hey Product Hunt! 👋 I built this because every mortgage calculator I found online was either stuffed with ads, required signup, or only showed you the monthly payment without the full picture. This one shows you everything a lender actually looks at — DTI ratio, PMI, qualification status, payment breakdown — and lets you run what-if scenarios (15yr vs 30yr, bigger down payment, etc.). The nerdy part: It's a single HTML file. No React, no frameworks, no CDN, no backend, no tracking. Just open it and use it. Open source on GitHub. The backstory: Six months ago I was a marketing guy with a decade of video production behind me. Then I discovered AI-native development (Claude Code) and haven't stopped building since. This is one of 10 tools I shipped in 16 days. The full portfolio is at sdb-portfolio.netlify.app. I'd love feedback — especially: - Is the DTI gauge clear enough? - Are the what-if scenarios useful? - What's missing that you'd want to see? Thanks for checking it out! 🙏

Mortgage Affordability Calculator - Know if you can afford it before you apply — single file

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