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Chrome extension

Know if a rental works before you finish reading the listing.

Undrly drops a live cash flow, cap rate, and ROI breakdown directly onto every Zillow and Realtor.com listing you look at - no spreadsheet, no tab-switching, no guessing.

Get Undrly - free to start See how it works →
👇 This is a real, working calculator - drag a slider, switch tabs, see what changes
UNDRLY
123 Example St - demo
Long-Term Rental Short-Term Rental
7.4 /10 SOLID
Monthly Cash Flow
$312/mo
List Price
$399,000
Summary Flags Math Assumptions Resources
Cap rate
5.9%
Cash-on-cash
4.2%
Break-even rent
$2,180/mo
Interactive example - not a real listing, but the math is 100% real
How it works

Five tabs. Every number you need.

Install it once. Undrly quietly attaches to Zillow and Realtor.com and runs the full analysis - Summary, Flags, Math, Assumptions, and Resources - the moment a listing loads.

Works right on the listing
No copy-pasting into a spreadsheet. The analysis panel appears directly on the Zillow or Realtor.com page you're already looking at.
Long-term & short-term modes
Toggle between traditional rental math and Airbnb/Vrbo-style short-term analysis, with assumptions tuned for each.
Flags tab catches what's buried in the text
Undrly reads the listing's own description and calls out things like deferred maintenance or "as-is" language automatically - and shows you exactly where it found it.
Math tab shows every formula
No black box. See the full line-by-line calculation behind cash flow, cap rate, and every other number, so you can trust it instead of taking it on faith.
See every assumption
Vacancy, maintenance, closing costs, mortgage rate - every number driving the result is visible and adjustable, not a black box.
Resources tab, tailored to this address
One click to nearby comps, a real landlord insurance quote tool, walk score, and local rental law - plus save properties to compare and export a clean PDF report.
The Flags tab

It reads the listing so you don't have to.

Undrly scans the description text on every listing for risk language and notable positives, then shows you the exact sentence it found - so you can decide for yourself, not just take a score's word for it.

Short-term rentals

See exactly what Pro unlocks.

Free shows you the shape of the deal. Pro fills in the real numbers - live nightly rate and occupancy pulled straight from AirROI, not a rough guess.

Free
Undrly Pro
Pricing

Free to start. Upgrade when you're ready.

Long-term rental analysis is always free. Undrly Pro unlocks short-term rental economics backed by live market data.

Monthly Annual Save ~17%
Free
For casual browsing and long-term rentals
$0
  • ✓ Unlimited long-term rental analysis
  • ✓ Instant 0-10 deal score on every listing
  • ✓ Cash flow, cap rate, and full math breakdown
  • ✓ Every assumption adjustable - vacancy, maintenance, closing costs, and more
  • ✓ Live 30-year mortgage rate, always current
  • ✓ Save up to 5 properties
  • - Short-term rental cap rate & cash-on-cash
  • - Live nightly rate & occupancy data
  • - Export polished PDF reports
Best for active investors
Undrly Pro
For anyone seriously evaluating short-term rentals
$14.99/month
  • ✓ Everything in Free, unlocked in full
  • ✓ Full short-term rental economics - cap rate, cash-on-cash, break-even ADR
  • ✓ Live nightly rate & occupancy from AirROI - real comps, not a guess
  • ✓ Full math breakdown for every STR number
  • ✓ Export polished PDF reports for lenders or partners
  • ✓ Unlimited saved properties
  • ✓ Direct email support from the person who builds it
  • ✓ Cancel anytime - no contracts
One property you correctly pass on pays for years of Pro.
Support

Questions, refunds, anything at all.

Undrly is an independent product - you're talking to the person who built it, not a support queue.

How do I cancel or update my subscription?
Manage your subscription here - cancel, switch plans, or update your card, no waiting on a reply. For anything else, email support@undrly.app.
Where do I download Undrly?
Undrly is a Chrome browser extension. If it's not yet listed on the Chrome Web Store, contact support@undrly.app for install instructions.
What data does Undrly use?
Property details (price, rent estimate, taxes) come from the listing page itself. Pro short-term rental estimates use market data from AirROI. Undrly does not sell or share your personal information.