Dupey ConsultingPROJECT / WEB APP
Will It Flow
RENTAL ANALYSIS WEB APP
A rental-analysis web app I built and run - live rates and rent data so investors can evaluate a deal in one place, plus market pages that bring in organic traffic.
- Status
- Live
- Project type
- Web app / product
- Role
- Founder & developer
WHY I BUILT IT
Evaluating a rental meant stitching mortgage rates, comparable rents, and local market numbers from different places, then running the deal in a spreadsheet - one property at a time. I built Will It Flow so that work happens in one place: live rates and rent data, and a calculator that updates as you change the inputs, so you can see whether a property cash-flows before you put in an offer.
THE CALCULATOR
A quick answer from the numbers that matter.
Enter a deal - purchase price, rent, financing, and expenses. The finance engine recomputes as you adjust. Cash flow, cap rate, DSCR, cash-on-cash, BRRRR outcomes, and multi-year projections update without a separate calculate step. Smart defaults fill the gaps so a first look doesn't require a complete underwriting file.
PRICE · RENT · FINANCING · EXPENSES → CASH FLOW · DSCR · CAP RATE
First-timers can get a verdict in under a minute. Deeper passes still have BRRRR, a multi-year outlook, and stress tests when the deal needs them.
HOW THE ANALYSIS WORKS
Same formulas. A live deal.
The engine is deterministic: the same inputs produce the same cash flow, cap rate, and DSCR. What changes is the property in front of you, not the math.
INPUTS
- Purchase price, down payment, and closing costs
- Monthly rent, other income, and vacancy
- Financing - conventional, seller, or all-cash
- Operating expenses - taxes, insurance, HOA, management, maintenance
OUTPUTS
- Monthly cash flow
- Cap rate, DSCR, and cash-on-cash return
- NOI, break-even rent, and the 1% rule
- BRRRR - ARV, capital returned, post-refi cash flow
THE PRODUCT UNDERNEATH
A finance engine with live data behind it.
The useful difference from a static spreadsheet is that the numbers stay current and the math stays in one place. Mortgage rates update from Freddie Mac. Rent can be grounded in HUD fair-market rents and listing comps. Housing-market pages refresh from a daily data pipeline. Saved deals live in an account, not a desktop file.
NEXT.JS · TYPESCRIPT · SUPABASE · STRIPE · VERCEL
- Live Freddie Mac mortgage rates
- HUD fair-market rents and listing comps
- Daily housing-market data into Supabase
- Saved deals with row-level security
- PDF deal sheets for partners or lenders
SEARCH / ORGANIC DISCOVERY
The product is also how people find it.
Alongside the app, the site publishes housing-market pages at national, state, and metro level, plus calculator landings and long-form articles. Those pages carry live rental and market data and refresh on a daily pipeline, so someone searching a market or a metric can land in the same product that runs the deal.
- Housing-market pages - national, state, and metro
- Calculator landings - DSCR, cap rate, BRRRR, mortgage, 1% rule
- Long-form articles tied back to the analyzer
WHERE IT LANDED
Will It Flow is a live public product.
An investor can go from a listing to cash flow, DSCR, BRRRR, and a multi-year outlook in one session - rates and rent data included - instead of rebuilding the model in a spreadsheet.
I designed and built it. The web app is live today.
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