Forward your listing alerts. See only the deals that pencil.
BuyBox Screener screens every listing against your numbers, so you stop copying alert emails into a spreadsheet and stop re-explaining your buy box to a chatbot every session.
Free plan: 5 deals a week. No card needed.
This week's screen (sample)
1234 E Main St, Mesa 85203
$389,900 · cash flow +$212/mo · max offer $402,000
2250 W Pecos Rd, Chandler 85224
$449,000 · cash flow -$61/mo · max offer $421,000
567 W Broadway Rd, Mesa 85210
$425,000 · cash flow -$298/mo · max offer $352,000
Illustrative numbers only.
How it works
Save your buy box once
Markets, price range, beds, down payment, rate, taxes, insurance, vacancy, CapEx, management, and your minimum cash flow, cash-on-cash and DSCR.
Feed it listings
Paste a Zillow, Redfin or Realtor.com link, the listing text, or a whole saved-search alert email. Pro users get a forwarding address.
See only what pencils
Every listing gets rent (HUD FMR or yours), cash flow, cash-on-cash, cap rate, DSCR, and the max offer that still hits your targets.
We don't scrape listing sites
BuyBox Screener reads only what you paste or forward: a link, the listing text, or the alert emails Zillow and Redfin already send you. Rents default to HUD's free FY2026 Small Area Fair Market Rents by ZIP and bedroom count, and you can override any number.
Create your buy boxDeterministic math you can audit
No black box. Every number shows its inputs: mortgage from standard amortization, NOI from your expense percentages, DSCR as NOI over debt service, and a max offer found by solving for the highest price that still meets every target.
By the numbers
Rent data for nearly every U.S. ZIP
Built in: HUD's FY2026 Small Area Fair Market Rents, 0 to 4 bedrooms, across 2,522 HUD rent areas. Six numbers on every listing: rent, cash flow, cash-on-cash, cap rate, DSCR and max offer.
38,601
ZIP codes with HUD rent estimates
Free tools