
Instant visual diffing between websites

CasaValidator
Rightmove
PropertyXRay.com.au
Zoopla
London property AI, backed by 2M Land Registry sales. Ask plain-English questions about London property prices, trends and affordability. Open data, open calculations. £1.99 for 10 queries.

Website, pricing, platforms and company facts side by side.
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| Website | diffee.me | openprop.co.uk |
| Pricing | — | |
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| Company | — | Startup from the United Kingdom · 1 - 9 employees · 2026 |
| Listed in |
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OpenProp is an AI property analyst for the London residential market. Ask anything in plain English — "median flat price in Lewisham 2024", "is Tower Hamlets a buyers' market", "where can a £450k budget actually reach" — and get an answer computed live from 1.76 million HM Land Registry Price...
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As answered by people managing Diffee and OpenProp.co.uk.
OpenProp.co.uk's answer:
OpenProp computes every answer live from 1.76M HM Land Registry transactions instead of summarising scraped portal listings or relying on an LLM's memory. A multi-agent router sends each question to a purpose-built specialist (market analysis, borough comparison, planning evidence, rent-vs-buy), so answers come back with the underlying numbers, charts, and transaction counts — not a confident guess.
OpenProp.co.uk's answer:
PropertyData and LandInsight cost £50–£500/month and require a property-industry login. Zoopla and Rightmove show asking prices, not sold prices. ChatGPT hallucinates London boroughs. OpenProp is £1.99 for 10 queries, one-off, no subscription — answers are auditable against the raw Land Registry source on every query, and every answer ships with the chart or heatmap that backs it.
OpenProp.co.uk's answer:
First-time buyers, renters deciding which borough to commit to, family upsizers, relocators moving into London, planning consultants and residents preparing objection evidence, and journalists who need defensible numbers fast. Anyone who needs a real answer about London property without paying agency rates or trusting a chatbot.
OpenProp.co.uk's answer:
Built by a solo data scientist who got tired of watching friends make six-figure London property decisions on the back of Rightmove asking prices and Zoopla "estimates." Open data exists — HM Land Registry publishes every London sale under OGL v3.0 — but it's a 5GB CSV most people can't open. OpenProp is the layer that turns that public dataset into plain-English answers anyone can use.
OpenProp.co.uk's answer:
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