An inspector checks the roof. An appraiser checks the walls. Mortar checks the numbers: real county taxes, math you can audit, and a straight verdict on any Zillow, Redfin, Realtor.com, or Homes.com listing in about ten seconds.
The listing says 4 beds and good bones. Mortar says $340 a month after the mortgage, the taxes, and the quiet costs the listing leaves out.
BUYPositive cash flow at 20% down. Rent estimate is moderate confidence.
The math talks
The verdict, line by line.
Every number Mortar uses is on the card: the rent, the real county tax bill, and the reserves most listings ignore. When the month nets out, the stamp comes down.
Features
What Mortar shows you
Four things the popup does the moment a listing opens. Every one of them is live below, running the real product math.
Shows its math
Tap any verdict and the popup unfolds the ledger behind it. The formulas sit on the card, not in a black box, and AI never does the arithmetic.
$150,000 listing, $1,850 rent, Ohio rates. Live product math.
Answers to your numbers
Change the down payment, the rate, or the term and the verdict recomputes on the spot. Your assumptions persist across every listing you open.
Works where you shop
No new tabs, no copy-paste, no spreadsheet. Open a listing on any of the four sites and the second opinion is one click away in the toolbar.
- Cap rate at least 7%8.6%
- Cash flow at least $200/mo+$232/mo
- Cash-on-cash at least 8%9.3%
Scored against your buy box
Tell Mortar what a deal has to be: minimum cap rate, minimum cash flow, your markets. Every analysis gets checked against your criteria, automatically.
How it works
From listing to verdict
Open a listing and read the result. The whole flow takes about ten seconds.
Open any listing
Browse Zillow, Redfin, Realtor.com, or Homes.com normally. When you're on a property detail page, Mortar can read it.
Click the extension
The popup opens and the analysis runs in about ten seconds. No copying. No spreadsheet.
Read the verdict
BUY, INVESTIGATE, or PASS, with cap rate, cash flow, and a one-line reason.
Founding Member offer, first 50 only. Lock Pro at $149/yr (reg $228) or Operator at $499/yr, forever. Your price never goes up. Discount applied automatically at checkout.
Pricing
Pay for depth, not basics
Start free: five analyses a month, forever. Upgrade when Mortar becomes part of how you work.
Mortar, next to the spreadsheet it replaces
- Time per dealAn evening of copy-paste
- Property taxOne rate, guessed once
- The formulasOne broken cell away
- The answerWhatever you talked yourself into
- Where it happensAnother tab, another export
- Time per dealAbout ten seconds
- Property taxCounty-level data, all 50 states
- The formulasDeterministic, shown in full
- The answerBUY, INVESTIGATE, or PASS
- Where it happensOn the listing, in the popup
For getting a feel for every listing.
- 5 deal analyses per month
- Deterministic cap rate, cash-on-cash & cash flow
- Real local property tax + insurance, by state
- Rent from Zillow's Rent Zestimate (AI fallback)
- Tunable down payment, rate & term
For active buy-and-hold investors.
- Everything in Free
- Unlimited analyses
- Buy-box scoring against your criteria
- Saved deals & analysis history
- Side-by-side property compare
For serious, out-of-state & agent operators.
- Everything in Pro
- Full pro-forma: buy & hold, BRRRR, flip & STR with multi-year IRR
- Risk flags + your max allowable offer
- One-page branded PDF deal memo
- Watchlist with price-drop alerts on re-scan
Every plan runs the same honest, deterministic math, with no inflated numbers. Cancel anytime. Prices in USD.
Mortar was built for one deal. Yours.
- BUY1327 Maplewood Avesaved this week
- INVESTIGATE88 Fernwood Drprice drop on re-scan
- PASS2054 Bayou Vista Ctarchived
Saved analyses, notes, and price-drop alerts on re-scan keep every deal you have touched one click away.
Numbers you can audit. AI never does the arithmetic.
Deterministic formulas compute every metric and the verdict. AI is only allowed to estimate rent when the listing has none, and it says so when it does.
County-level tax data · All 50 states · Estimates, not advice
FAQ