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The Viiyoo platform · one product

Use the tools yourself. Or hand over the brief.

One workspace for buying and holding homes at scale: find and value the homes that fit, underwrite them, plan a programme against your mandate and watch the homes you hold. Every plan includes all of it, and the same allowance pays for the work you do yourself and the briefs you hand over.

Talk to us See the plans
Great Britain market coverageValuations in England & Wales, Scotland on requestClient data held in the UK
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.

What you can do

Six jobs, one workspace.

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

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

Live homes across Great Britain on a map, by strategy or in a sentence, with scouts that keep watching.

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.

Every plan includes

The whole platform, on every plan.

Plans differ only by volume. See the plans.

Find

  • Search and map across the main property portals, with duplicates removed
  • Saved searches
  • Scouts that rank new matches and email a digest

Analyse

  • Valuations from comparable sales, with a range and confidence
  • Rent assessments from comparable lettings and the LHA
  • Full underwriting: cash flow, stamp duty, lender stress test, grants such as LAHF and SHAP
  • Works costing; condition, auction and dispute flags

Market intelligence

  • Tables and maps by region, council, ward and postcode district
  • Trends, supply, selling speed and rent-to-income
  • Scenario modeller
  • CSV and PDF export, saved views

Mandates and engagements

  • Write a mandate, the rules, in plain words or a form
  • Acquisition screens, value-add appraisals, deployment plans and portfolio rent reviews
  • Standing briefs that report what changed since the last release
  • Your own person reviews and releases

Portfolios

  • Holdings
  • Rent monitoring against the market and the LHA

Outputs

  • Packs, workbooks and CSVs in your own branding
  • Every figure traceable to its source
  • A decision log and a full audit trail

Ways in

  • The web app
  • The Claude and ChatGPT connectors
  • Single sign-on and SCIM

Service

  • Your methodology profile set up and calibrated at onboarding
  • A named support contact
  • Client data held in the UK
See it working

The screens, as they are today.

Every tool an engagement uses is yours to run, and your own AI agents can work from the same evidence through the Claude and ChatGPT connectors 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 social housing mandate: a map shaded by capital allocated per local authority and a table of homes, capital, share, eligible stock, median yield and quarters to buy for each area, led by Northumberland with 68 homes and £4.97 million.
A 3-bed semi-detached house in Manchester M20 valued at £395,000 with a range of £333,000 to £456,000 at high confidence, from 12 comparable sales within 500 metres, with the note that 8 in 10 homes valued like this sold within the range in testing on 1,929 past sales; market rent £1,595 a month, gross yield 4.9%, the last sale, key facts with their sources and the reasons behind the figure.
A constraint ledger: no net-yield target set, area concentration within 20% of equity per area with Northumberland largest, no Article 4 areas, ranked social tenure first then by yield on cash before grant, and what relaxing each rule alone would change in yield, capital and homes.

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

Accuracy

Every figure tells you how sure it is.

Every value comes with a range and a confidence level, doubt is flagged rather than hidden, and no figure comes from AI. We test it all on homes that have sold, and publish the result.

7.4%

median difference from the price paid where confidence is high

8 in 10

sale prices fell inside the range Viiyoo gave

8.9%

median difference from the price paid, across every confidence level

−0.7%

average bias: Viiyoo values 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.

Designed or being built, and not yet switched on. We label it rather than blur the line, and it joins every plan when it is live.

  • Market forecastsPrices and rents 3, 6 and 12 months ahead, with an upside and a downside, withheld where the evidence is thin, and their accuracy published. The method is agreed; it is being built.
  • Neighbourhood rulesSchools, GPs, crime, lease length and what a listing says about access, as rules a mandate can use. Being designed.
  • Listings with no house number, valued as a typical homeSo the last listings that cannot be placed on one home can still be screened. Being built.
  • Viiyoo in the Claude and ChatGPT directoriesThe connectors work today as custom connectors; directory listings are on the way.

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

See it on your own patch.

Access is by invitation today. Talk to us and we will show you the work on the homes and areas you know, before you decide.

Talk to us See the plans