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Open a listing on Zillow, Redfin, Realtor.com, or Homes.com. Mortar reads the numbers, tells you if the deal is worth it. Mortar is a real estate investment tool that turns any for-sale listing into a rental property analysis in seconds. Open a listing on Zillow, Redfin, Realtor.com, or Homes.com, click the Mortar icon, and you get the cap rate, cash flow, and cash-on-cash return, with no spreadsheet. WHAT IT DOES Mortar reads the price, beds, baths, square footage, and address off the listing page, estimates the rent, and runs the numbers: - Monthly cash flow - Cap rate - Cash-on-cash return - A plain-English read on whether the deal is worth a closer look WHO IT IS FOR Rental property investors, house hackers, BRRRR and flip buyers, out-of-state buyers, and agents who screen listings all day and want an honest read before spending an hour underwriting one. WHY IT IS DIFFERENT Real local costs. Property tax and insurance are estimated by state, not by a flat national average, so the verdict holds up in high-tax markets like Texas, Florida, New Jersey, and Illinois. Numbers you can check. Every metric shows the math behind it. Mortar will not inflate a deal to make it look better than it is. Your assumptions, not ours. Set your own down payment, interest rate, and loan term. Type in your own rent and every metric recalculates. WORKS ON Zillow, Redfin, Realtor.com, and Homes.com for-sale listing pages. PRICING Free analyses every month, no card required. Pro adds unlimited analyses, buy-box scoring against your own criteria, saved deals, history, and side-by-side compare. Operator adds a full pro forma for buy-and-hold, BRRRR, flip, and short-term rental, with multi-year IRR, risk flags, your maximum allowable offer, and a one-page PDF deal memo. PRIVACY Mortar runs only on the listing page you ask it to analyze. It does not follow you around the web, does not show ads, and does not sell your data. getmortar.app Mortar gives you estimates to help you screen deals. It is not financial, investment, or real estate advice, and it is not an appraisal.
Sep 6, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.