UK Property Research Tools: Ground Truth vs PropertyData, PostcodeData.io and the rest
An honest comparison of the tools UK buy-to-let investors, home buyers and property sourcers actually use — PropertyData, PostcodeData.io, Property Market Intel, DeedSight, HomeThink, The Buy-To-Let Platform, Propital, PropMarker — and where Ground Truth fits.
TL;DR
Pick PropertyData if you just want yield and comparables, PostcodeData.io if you need ownership + planning in one report, and deal-sourcing platforms (The Buy-To-Let Platform / Propital) to find listings. Pick Ground Truth if you want a workspace that compounds across every property you research — a Miro-style Portfolio Board, AI briefings across your whole history, Chrome sidebar on Rightmove, and a one-click export of your research to ChatGPT / Claude / Gemini. £12/month, unlimited reports.
Feature comparison
| Feature | Ground Truth | PropertyData | PostcodeData.io | DeedSight |
|---|---|---|---|---|
| Free tier | Unlimited reports | Trial only | Trial only | — |
| Rental yield + LHA coverage | ✓ | ✓ | ✓ | ✓ |
| Crime, flood, schools, EPC in one report | ✓ | Limited | ✓ | ✓ |
| MEES 2028 compliance flag | ✓ | — | — | — |
| AI-generated verdict + score | Claude Sonnet 4.6 | — | — | Proprietary |
| Portfolio Board (Miro-style canvas) | ✓ | — | — | — |
| Manual link drawing between properties | Grasshopper-style ports | — | — | — |
| AI briefing across your full research history | ✓ | — | — | — |
| Send-to-AI export (ChatGPT/Claude/Gemini) | ✓ | — | — | — |
| Chrome extension for Rightmove / Zoopla | ✓ | — | — | — |
| CSV portfolio export | ✓ | ✓ | — | — |
| Covers US / France / Canada | ✓ | UK only | UK only | UK only |
| Monthly price | £12 | £15-£109 | £19-£49 | £25+ |
Tool-by-tool breakdown
Ground Truth
The only tool on this list built as a workspace rather than a one-off lookup. Every report you generate becomes a card on the Portfolio Board — a Miro-style infinite canvas with alignment guides, sticky notes, drag-to-link Grasshopper ports, and an AI briefing that reads your whole research history.
The Chrome extension injects Ground Truth scores into every Rightmove / Zoopla / OnTheMarket listing you browse. The "Send to AI" button turns your whole portfolio into a structured prompt you can paste into ChatGPT, Claude or Gemini for deeper analysis — positioning Ground Truth as the input layer to your LLM workflow, not a competitor.
Data: HM Land Registry, Police.uk, Environment Agency, EPC register, Ofsted, TfL, Ofcom, Companies House, ONS, Historic England, Natural England, VOA LHA, Overpass (OSM), + US Census, HUD, FEMA, INSEE, CREA.
PropertyData
Long-established. Strong core numbers — yields, comparables, price trends, deal analysis. The interface is utilitarian and each search is isolated (no persistent workspace). Export is CSV-level. If you just want "what's the yield on this postcode", it's fast.
Choose PropertyData over Ground Truth if: you only ever analyse one postcode at a time and don't need Portfolio comparison, EPC compliance flags, or AI synthesis.
PostcodeData.io
Combines Land Registry ownership, EPC, planning applications and valuation into a per-postcode PDF report. Good depth on legal/ownership data specifically, which Ground Truth's free tier doesn't currently match at the individual-title level.
Choose PostcodeData.io over Ground Truth if: your primary need is title-level ownership information and planning case history.
Property Market Intel
Claims 60+ datasets for market trends and deal scoring. Strongest on volume of data. Expensive relative to the alternatives here and aimed at agencies rather than individual investors.
DeedSight
AI-first deal analysis — flags overpriced properties and calculates yield + risks in seconds. Narrower scope than Ground Truth but optimised for speed when you're triaging many listings.
HomeThink
Pulls crime, flood risk and comparables automatically for home buyers (not specifically BTL). Lighter-touch than Ground Truth's full 14-category report.
The Buy-To-Let Platform
Deal sourcing rather than deal analysis. Combines listings + mortgage data + rent analysis. Complementary to Ground Truth — many users pair them (use the Buy-To-Let Platform to find candidates, use Ground Truth to research and compare them on the Board).
Propital
Curates deals based on your strategy. Marketing-heavy — treat their "recommended" deals as a starting point, not a verdict. Use Ground Truth's free report to sanity-check any Propital suggestion before you make an offer.
PropMarker
Highlights hidden value — e.g. properties where you can add a bedroom. Highly specific use case; not a substitute for general area research.
When to use which
I'm a new BTL investor comparing 10+ postcodes
Start with Ground Truth's free tier — generate full reports for each postcode, drop them on the Portfolio Board, use the "Same district" connection mode to spot clusters, then compare with the infographic overlay. When you want rental yield deep-dive, upgrade to £12/mo or grab a £7 pack for three unlocks.
I just need the yield on one postcode, right now
PropertyData is faster if you don't need anything else. If you want the answer and to keep it for comparison later, Ground Truth's free report covers it.
I'm browsing Rightmove and want to sanity-check listings as I scroll
Install the Ground Truth Chrome extension — a sidebar appears on every Rightmove / Zoopla / OnTheMarket listing with the area score, median price, yield, EPC band, crime and flood at a glance.
I want to pipe my research into ChatGPT / Claude
Only Ground Truth does this currently. Click "Send to AI" on the Portfolio Board — it generates a structured prompt containing your whole researched portfolio, auto-detected connections, and your notes, plus one-click links to ChatGPT, Claude and Gemini.
I'm an agent or sourcer running reports at volume
Ground Truth CSV export + unlimited premium reports + Board sharing works at scale. The Chrome extension means your team can drop Ground Truth scores into any Rightmove-based workflow.
What Ground Truth doesn't do (yet)
Being honest about gaps:
- Individual title / ownership lookup: PostcodeData.io is stronger here at the per-property level.
- Deal sourcing (finding listings): We analyse what you bring us. The Buy-To-Let Platform and Propital source deals.
- Mortgage brokering: We estimate, we don't originate.
Frequently asked
What's the best free UK property research tool?
Ground Truth's free tier is the most generous — unlimited reports covering 14 data categories plus an AI-generated verdict and score. Most competitors (PropertyData, PostcodeData.io, Property Market Intel) require a paid subscription from day one.
What's the best alternative to PropertyData?
For yield + comparables, Ground Truth covers the same ground at £12/mo vs PropertyData's £15-£109 tiers. Ground Truth also adds EPC compliance, the Portfolio Board for multi-property comparison, and a Chrome extension — features PropertyData doesn't currently have.
Does Ground Truth replace PostcodeData.io?
For area analysis, yes. For title-level ownership information specifically, PostcodeData.io is still the stronger choice — we're better at "should I buy in this area?" questions than "who owns this exact title?".
Can I use multiple tools together?
Yes — many investors do. A common stack: The Buy-To-Let Platform for listings → Ground Truth (free + Chrome extension) to analyse each → upgrade to Ground Truth £12/mo once you're narrowing down.