Show HN: I built a real estate deal analyzer that handles hard money loan math (re.rtn.capital)

Hello HN,

I’m the developer behind RunTheNumbers. It’s a free suite of tools to analyze real estate deals (BRRRR, Fix & Flip, and Rentals).

I noticed that most new investors rely on complex Excel sheets that are brittle and prone to breaking—especially when you try to factor in "Hard Money" loans, bridge financing, or variable holding costs. The existing web calculators were often too simple or behind a paywall.

I built a dedicated engine that handles the messy logic of hard money loans (points, interest-only periods, etc.) and allows you to export "Lender-Ready" PDF reports directly from the browser.

I’d love to get your feedback on the UX and whether the "Cash on Cash" calculations feel intuitive to you.

Thanks!

1 comment

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investbot 5mo ago ↗

Nice work on making the hard money loan math transparent — that's often a black box. I'm building a tool in a similar "rational decision-making" space, but for stock portfolios (InvestBot). Your approach to breaking down complex financial terms into interactive inputs is exactly the UX challenge we face with risk constraints like max drawdown and concentration caps. Question from one builder to another: How did you validate which specific loan parameters were most critical for users to control? We're constantly prioritizing which risk rules to expose first.