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US residential · BRRR strategy

Does this deal pencil?
Find out in 60s.

Buy, Rehab, Rent, Refinance, Repeat — without the spreadsheet. Enter what you know, the engine fills in the math, you get a verdict and the scorecards behind it.

Analyze a propertyHow it works

No account · No credit card · No email · Shareable URLs

…/analyze
Live demo

Verdict

Strong BRRR

Refi covers all capital

Strong

Cash left in

$0

≤ $10k strong

DSCR

1.35

≥ 1.25 strong

Post-refi CoC

∞

Refi recovered all capital

MAO

$186K

vs purchase

$175k purchase · $330k ARV · $3,400 renttry this in /analyze →

From spreadsheet to verdict

Before

A 14-tab spreadsheet, copied from someone’s guru course.

  • Refi math hidden in a circular reference
  • Tax + insurance lines you forgot to update
  • No verdict — just a row of numbers you have to interpret
  • Different file per property, untracked, untested
After

One screen. A verdict, a scorecard, and the math behind it.

  • Strong / Marginal / Skip — instant verdict, opinionated thresholds
  • Refi waterfall + cash-left-in + DSCR + MAO in one frame
  • Sensitivity stress-test + sweet-spot reverse-solve, built in
  • Tokenized share link — no account, no email, no upsell
How it works

Numbers in, verdict out.

The engine is pure math — 100% line coverage, 1,300+ tests across the app. The form is opinionated. The output is one screen: verdict, scorecard, refi waterfall.

One screen. Three answers.

Verdict — Strong, Marginal, or Skip. Scorecard — ten metrics with pass/fail status. Waterfall — visual breakdown of refi math.

DSCR

1.35

MAO

$186k

Left in

$0

Refi waterfall

$0 left in · all capital recovered

Capital in
Refi out
Costs
Left in
1% rule1.94%
Cap rate9.0%

Stress-test on autopilot

What if rent drops 10%? Rate jumps 1.5pp? Every analysis runs 6 scenarios and a 200-trial Monte Carlo equity band.

Rent −5%Rate +1ppARV −10%

Solves for your offer

Bisection finds the max purchase, min rent, and max rehab that still earn a Strong verdict — so you walk into negotiation with numbers, not vibes.

Max offer$186k+$11k headroom

Why not just use…

How it stacks up.

A spreadsheet does the math, eventually. A paid calculator does the basics. BRRR Analyzer does the math plus the stress tests, the reverse-solves, and the share link — all free.

  • Refi waterfall visualization

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Cash-left-in math after refi

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • DSCR check against lender threshold

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Sensitivity stress-test (6 scenarios)

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Sweet-spot reverse-solve

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Monte Carlo equity bands (200 trials)

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Tokenized shareable URL

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Free, no signup, no email

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • FEMA flood + Census demographics built in

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • Investor-packet PDF export

    Spreadsheet
    Typical paid calculator
    BRRR Analyzer

  • BRRR Analyzer wins 9 of 10 — free, ~60 seconds.

Geographic coverage

Works for any US deal.

Federal data is free everywhere. Three cities get extra free adapters. Anywhere else, your own RentCast key adds per-property auto-fill.

All 50 states — free

HUD Fair Market Rents, Census ACS demographics, FEMA flood zones, FHFA HPI. Federal data covers any US address out of the box.

  • HUD FMR
  • Census ACS
  • FEMA flood
  • FHFA HPI

3 cities — bonus free auto-fill

Open-data partners give us per-property building characteristics and sales history at no cost.

  • NYC · PLUTO + ACRIS
  • Philadelphia · OPA + RTT
  • Cook County · Sales

Everywhere else — bring your key

Paste a RentCast API key in settings for per-property auto-fill anywhere in the US. The key lives in your browser only — never touches our server.

  • ~$25/mo from RentCast
  • browser-only key
FAQ

Common questions.

Is my deal data private?
Yes. The anonymous flow stores nothing personal — analyses live in a D1 row tied to a random share token, with no email or account attached. Signed-in deals are isolated per-user. We don’t sell anything, run 0 trackers, and set 0 cookies (only Cloudflare’s cookieless Web Analytics beacon).
What if my city isn’t NYC, Philly, or Cook County?
All 50 states get the federal data stack for free (HUD FMR, Census ACS, FEMA flood zones, FHFA HPI). For per-property auto-fill anywhere else, paste a RentCast API key in /settings — the key lives in your browser only and calls RentCast directly.
How accurate is the refi math?
The calc engine has 100% line/branch/function/statement coverage, backed by 1,300+ tests across the app. Formulas are cross-checked against canonical BRRR math — refi-loan = LTV × ARV, cash-left-in = all-in cost − refi-loan, DSCR = NOI ÷ annual debt service.
Can I save a deal without signing up?
Yes. Every saved deal gets a tokenized share URL like /share/<token> — copy the link, paste it into your notes, share it with a partner. Sign in only if you want the deal to sync across devices.
Why is this free?
No paid tier exists yet. Bandwidth runs on the Cloudflare Workers free tier (100k requests/day), Resend covers magic-link emails (3k/mo free), and the optional AI deal-memo only costs me money when ANTHROPIC_API_KEY is set in production. There’s no upsell funnel.
Who built this?
Built by a real-estate investor who got tired of guru-priced spreadsheets and BiggerPockets calculators that bury the verdict. It runs entirely on Cloudflare’s free tier — no venture funding, no upsell, no email list.
  • 1,300+total tests
  • 100%calc engine coverage
  • 0trackers
  • 0cookies

Score your next deal.

A sample deal is pre-loaded — one click and you’re looking at a real Strong verdict with the full waterfall. Then swap in your address and your numbers.

Analyze a propertyFree · No account · ~60 seconds

The loaded sample

$175k purchase · $45k rehab · $330k ARV · $3,400/mo rent

Verdict

Strong

DSCR

1.35

Left in

$0

Edit any field — the engine re-scores live as you type.