forfree.tools

forfree.tools is a growing library of free web tools with no accounts or paywalls. Its flagship tools read a pasted Zillow or Redfin listing, pull out price, units, taxes, and rents, and run investor math for FHA self-sufficiency, BRRRR, and owner-financed slow flips.

Visit the live site

Type: Web app
Year: 2026
My role: Product, design, development
Status: Live

forfree.tools homepage: dark hero with the headline Free A.I. tools that actually deserve to exist, Browse tools and Try the FHA Checker buttons, and counters for tools live, paywalls, and accounts

forfree.tools homepage on a phone: Now live badge for the A.I. FHA Checker above the Free A.I. tools headline, with Browse tools and Try the FHA Checker buttons

The brief

I wanted investor calculators that start from a listing link instead of a blank form. Paste a URL and the tool fills in the numbers, runs the math live, and shows whether the deal works, with no signup, email gate, or paywall in the way. The FHA checker leads the set, built for the self-sufficiency test that 3 to 4 unit house hacks have to pass.

What I built

FHA Self-Sufficiency Checker: paste a 3 to 4 unit listing and see the 75% net-rent test, PITI plus mortgage insurance, and the monthly surplus or shortfall
Listing reader for Zillow, Redfin, Realtor.com, Homes.com, Trulia, and Compass, with a backup method for sites that block simple requests
Rent estimates that use HUD Fair Market Rent data by ZIP code as a baseline, plus photo analysis of listings for condition and accessory-unit clues
BRRRR Calculator that estimates ARV, rehab budget, and market rent from a listing URL, then runs the refinance math and grades the deal
Slow Flip Calculator for owner-financed sales, modeling cash flow, cash-on-cash return, and what happens if the buyer defaults
Kalshi Volatility Calculator that reads a market URL, computes fee-correct sell prices and touch probabilities, and grades the trade from A+ to F
Compound Interest Calculator with daily to yearly compounding, recurring contributions, annual increases, and a year-by-year growth chart
AI lookups with enforced time limits, so a slow request ends in a clear error message instead of a generic failure page