10,000 listings.
Your twenty.
A browser extension that turns Rightmove and OnTheMarket into a personal shortlist. It filters by the keywords that actually matter to you, flags price drops and relistings, and remembers every home you've already judged.
The portals show you everything.
We remember your preferences.
Everything runs in your browser, on the portal pages you already use.
Relist detection
Same address, new listing ID? The card gets stamped as relisted with the date it actually first hit the market. The most useful fact in a negotiation, and the one the portal no longer shows.
Verdicts, not sorting
Every listing gets stamped MATCH, RULED OUT or SHORTLISTED based on your required terms, deal-breakers and weighted nice-to-haves. AND/OR keyword logic the portals don't offer.
The whole search, one page
Scans every results page in the background and shows the true match count, with matches from page 12 pulled up to where you can see them.
Price history & drops
Every price seen is remembered per property. Drops get flagged on the card, in the feed, and with sparklines on your dashboard.
Red flags, spotted early
A fixed checklist of known traps: short leases, auctions, shared ownership, cash-only, escalating ground rent, knotweed and more. If the listing text mentions it, the card gets flagged before you fall in love.
Watched searches & intel
Opt-in background checks every 30 minutes. New matches, price moves and listing edits land in one feed with a badge on the toolbar. No tabs, no emails.
No accounts. No servers. No tracking.
Everything Property Sieve knows lives in your browser's local storage: your criteria, your shortlist, every price it has seen. Nothing is uploaded anywhere, because there is nowhere to upload it to. Export it as a file whenever you like; it's yours.
Install in about a minute
Property Sieve is a private tool, installed directly. It is deliberately not on the Chrome Web Store. Works on Windows, Mac and Linux, in Chrome or any Chromium browser (Edge, Brave, Arc).
Questions you should ask
Is this… allowed?
Property Sieve is an independent, unofficial tool for personal use. It annotates pages you're already browsing and is deliberately polite: spaced requests, early-stop scanning, opt-in background checks. It is not affiliated with or endorsed by any property portal.
Which portals does it work on?
Rightmove and OnTheMarket today. The architecture treats portals as plug-in adapters, so others can follow.
Where does my data go?
Nowhere. It's stored by Chrome on your machine (chrome.storage.local). The extension
makes requests only to the portal you're browsing. There's no backend, no analytics, no accounts.
Do alerts work with Chrome closed?
Checks run while Chrome is open (even minimised, no tabs needed). If Chrome was closed, the next check catches up; new listings are detected by ID, not by timing.
How do updates work?
Download the new zip, replace the folder contents, hit reload on chrome://extensions. Your data and settings survive updates because they live in the browser, not the folder.
Why is it free?
It's a studio product, built by Commissioned Code to show what a focused tool can do. If you'd like something like this for your own workflow, that's the part that isn't free.