Free Chrome Extension · Built for Investors

Underwrite Zillow deals
in 5 seconds.

Color-coded A/B/C grades on every Zillow search card. Click any listing for live cash flow, cap rate, cash-on-cash, and Y1 equity build. No account, no API keys, no spreadsheets.

zillow.com/homedetails/123-Maple-St

$249,000 · 3 bd / 2 ba · 1,420 sqft

123 Maple St, Anytown
— Zillow listing —
Deal Analyzer
A
Strong deal
Cash-flows $284/mo at 25% down
Cash flow
+$284
Cap rate
7.12%
Cash-on-Cash
9.4%
1% Rule
0.86%
Y1 equity build +$2,840 · True return +$521/mo

Built for speed-underwriting.

Browse Zillow normally. Bad deals get flagged red. Good deals jump out green. Click in for the full breakdown.

A/B/C grades on every card

Search-page badges show 1% rule, cash flow, and cap rate per listing. Scroll the map view and assess 50+ deals a minute.

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Real cash flow math

Live mortgage rate from Freddie Mac. Real ZIP-level rent data covering all 30,000+ US ZIPs. Full PITI + reserves baked in.

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Equity build & true return

Year-1 principal paydown surfaced as a real return. Reframes "tough deal" verdicts where appreciation is the play.

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Filter by grade

Scrolling 500 listings? Tap "show A only" — red and amber cards dim instantly so green deals jump out.

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Plain-English risk callouts

"Built in 1925 — plan for higher CapEx." "On market 75 days — sellers often soften." Surfaced where it matters.

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Your assumptions, saved

Down %, mortgage rate, vacancy, maintenance, CapEx, mgmt — set once in the floating widget, applies to every deal.

One click to install.

No account, no API keys, no setup. Click "Add to Chrome" and start analyzing your next listing.

Add to Chrome Pending review

The extension is currently being reviewed by the Chrome Web Store (1–3 business days). Once live, install will be a single click. Want beta access now?

Pin the extension

Click the puzzle-piece icon in Chrome's toolbar and pin "Deal Analyzer" so the toolbar icon is always visible. Then click the icon and set your default down payment in Settings.

Open any Zillow listing

The analysis panel slides in on the right. Edit any field, watch every metric update. Browse a search page — every card gets an A/B/C deal grade automatically.

Want beta access while we wait for store approval?

Download the extension now and load it in Chrome's developer mode. Same product, just a few extra clicks to install.

↓ Download ZIP (Chrome / Edge / Brave / Opera)
Show beta install instructions
  1. Unzip the downloaded file. Move the unzipped folder somewhere stable (e.g., your Documents folder).
  2. Paste chrome://extensions into Chrome's address bar.
  3. Toggle Developer mode ON in the top-right corner.
  4. Click Load unpacked and select the unzipped folder.
  5. Done. The extension card appears with a blue $ icon. Open any Zillow listing to see it.

FAQ

Is it really free?

Yes. No subscription, no signup, no usage limits. The extension uses public data sources (Freddie Mac mortgage rate, Zillow's public ZIP rent index) so there's nothing to charge for.

Does it touch my Zillow account?

No. It reads price, rent estimate, beds, sqft, and ZIP from the page — same data you can already see. Never logs in, never submits anything, never modifies the page.

Where do my settings go?

Stored locally in your browser via chrome.storage.local. Nothing leaves your device. Uninstall the extension to wipe everything.

How accurate are the rent estimates?

Backed by Zillow's published ZORI dataset (median rents by ZIP) plus calibrated bedroom multipliers. Use the override field if you have better local comps — your number is always the source of truth.

Will it work on other sites?

Today, just Zillow. Realtor.com, Redfin, and LoopNet support are on the roadmap if there's demand.

Is this affiliated with Zillow?

No. Deal Analyzer is an independent third-party tool. Zillow® is a registered trademark of Zillow, Inc.

Stop spreadsheeting. Start scrolling.

Drop it in, open a Zillow listing, and you'll know in 5 seconds whether to keep clicking or move on.

↓ Get Deal Analyzer — Free