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ViiyooA Proanex product

From first look to investment committee.

Viiyoo is one workspace for residential investment: measure the portfolio you hold, deploy capital to a mandate, find and value the homes that fit, and record the decision, with every figure traced to its source.

Send us a real brief Engagements: results as a service
Great Britain market coverageValuations in England & WalesEarly access
Viiyoo's home screen, the book of business: £291 million of capital in plans across 2,814 homes, homes held with their passing rent, homes flagged by the organisation's rules, decisions awaiting sign-off, mandates, portfolios, recent changes, saved searches and recently analysed homes.

Real Viiyoo screen from a demo organisation. Addresses are replaced with descriptions.

The platform

One loop, not six tools.

What you hold, what you buy next and why you bought it live in one place, so each decision starts from the last one.

Results as a service · Engagements

Or hand over the brief, and get back the finished work.

Give Viiyoo a list or an area and your mandate. Get back the shortlist, the exclusions explained by rule, every gap with what would close it, and committee-ready packs, released by a named person.

How engagements work
01 · Measure

Know your book

Import the portfolio you hold, benchmark every home against market, LHA and your mandate, and model what-ifs.

02 · Plan

Deploy to a mandate

Write or upload the mandate. Get a screened, underwritten, stress-tested plan and a committee pack.

03 · Find

Search and scout

Every live home in Great Britain on a map, by strategy or in a sentence, with scouts that never stop looking.

04 · Value

Value and underwrite

Calibrated values, rents from comparable lettings, the right stamp duty for each nation, and the area behind it.

05 · Decide

Record the decision

A decision drafted on pinned evidence, frozen with its pack and signed off by a second person.

06 · Watch

Keep watch

Sales, certificates, planning, ownership and rule breaches on the homes you hold, as alerts and webhooks.

The engine underneath

Not a mock-up. The product.

Every part an engagement uses is yours to run as well, and your own AI agents can work from the same evidence through an MCP server and a versioned API. For agents and developers.

A portfolio of six homes benchmarked against a mandate: none fit, a 3.80% blended net yield against a 5.5% floor, £21,201 a year of income not collected, the gap to the mandate listed in plain words and the tenure mix against target.
Market capacity for a North East mandate: a map shaded by capital allocated per local authority, and a table of homes, capital, share, eligible stock and median yield for each area, led by County Durham at £59.6 million.
A 4-bed house in Harrow valued at £580,000 with a range of £470,000 to £691,000 and medium confidence, market rent, gross yield and last sale, key facts with their sources and the reasons behind the figure.
A constraint ledger listing each mandate rule, its kind and limit, the plan's measure and status, and the cost of relaxing each rule alone.

Real screens from a demo organisation. Addresses are replaced with descriptions.

Who it's for

Built for people who sign things off.

Investors & landlords

Screen deals quickly and underwrite the ones worth a second look.

Funds & family offices

Turn a mandate into a deployment plan and a pack for committee.

Lenders

Check value, rent and stress on security with the evidence attached.

Advisers & housing providers

Review portfolios and rents against the market and LHA, and show clients why.

Proof, not promises

We publish how often we are wrong.

Every valuation comes with a range, and the range is honest: we test it on homes that have sold and publish the result.

8.9%

median gap between our value and the price paid

8 in 10

sale prices fell inside the range we gave

78%

of homes valued within 20% of the price paid

−0.7%

average bias: neither high nor low

Homes valued as they stood on the day they sold: 290 sales across 40 postcode districts in England and Wales, July 2025 to June 2026. Measured 28 September 2026.

How we measure accuracy

Built for institutions

Ready for the people who check the work.

Secure by default

Single sign-on through your identity provider with SCIM, or authenticator-app sign-in; visible sessions and an audit log owners can read.

Decisions with a second signature

A decision is frozen with its evidence pack and signed off by a second person. No API can sign one off.

Your brand on the work

Reports and emails carry your organisation's name and colours, powered by Viiyoo.

Books of real size

Portfolios of up to 20,000 homes; 10,000 assessed in about 80 minutes.

Coming next

What is on the way.

Built, in progress or planned, and not yet switched on for clients. We say so rather than blur the line.

  • HM Land Registry titles and official copiesFind a property's titles and buy official copies from a prepaid balance.
  • Viiyoo inside Claude and ChatGPTConnect without a command line, listed in each assistant's directory.
  • Valuations in ScotlandMarket data already covers Scotland; valuations need the Scottish sales register.
  • Engagement packs in WordEach engagement pack as a .docx as well as a PDF, for your own committee template. What comes next

Viiyoo is made by Proanex Ltd

A UK technology company registered in England and Wales (company number 17461523). Built on open and official UK property records.

About Proanex

Send us a real brief. We'll run it with you.

Tell us the list, the area, the mandate or the book you would hand over first.

Send us a real brief