A Proanex product
From first look to investment committee.
Viiyoo turns an investment mandate into a deployment plan, keeps scouts watching the market for you, and underwrites any home with the evidence attached. Every figure shows where it came from, so you can stand behind it.
Buy-to-let, 60% LTV
Deterministic- !Rates +2 pts−£450 / mo
- !Rent −10%−£90 / mo
- !Two void months a year−£250 / mo
Illustrative screen. Figures are examples.
Deploy capital
From a mandate to a screened, underwritten, stress-tested plan and a committee pack.
Scout the market
Always-on scouts that underwrite every new listing and tell you only what changed.
Value and underwrite
Any home: comparables, a valuation range, rent evidence and the deal maths.
Plug in your agents
An MCP server and API, so your own AI assistants work from Viiyoo's figures.
Write the mandate. Get the plan.
Tell Viiyoo how much you're deploying, where, into which tenures and against which limits. It screens the market, underwrites every candidate for its sleeve, allocates within your rules and hands you a plan your investment committee can test.
- A real mandate, not a filter. Equity, leverage, horizon, an income, growth or impact objective, and sleeves with their own tenure, rent basis and grant.
- Your limits enforced. Caps on area, single asset, leasehold and grant reliance; yield floors with and without grant; Article 4 and flood risk avoided. Every exclusion gives its reason.
- Stress-tested. Up to seven scenarios, from grant not awarded to rents down and costs up, and a first tranche with its worst-case cash.
- Honest about capacity. A feasibility frontier shows how much the market can absorb at each yield floor, and what relaxing each rule would buy you.
- Watched. Scheduled re-runs show which homes entered or left the plan and why, and bridge the change in yield.
| Sleeve | Weight | Rent basis | Grant |
|---|---|---|---|
| Private rented | 60% | Market | — |
| Temporary accommodation | 25% | LHA | — |
| Affordable | 15% | 80% of market | £40k / unit |
Scouts that never stop looking.
Describe what you buy in plain English. Viiyoo proposes a buy box using only the numbers you gave it, and saves nothing until you confirm. Then a scout watches the market for you, on the schedule you choose.
- Every listing underwritten. Each new home is screened, benchmarked against local rents and sold prices, underwritten and ranked. Deals that look too good to be true go to the bottom.
- Only what changed. New matches, price cuts and rises, homes gone or under offer, and homes that no longer fit. From every six hours to weekly.
- A note on every match. A short, checked note says why a home matched and what to look at, and never tells you to buy.
- It learns from you. "Not this area" or "too small" becomes an exclusion you can see, preview and edit before it's applied.
- New matchUnderwritten2-bed flat, W13£385,000 · 6.1% net · rank 1 of 12Note · checkedAsking price sits 7% below recent sales of similar flats within half a mile. The lease has 94 years left, which lenders may price in.
- Price cutRe-scored2-bed flat, UB6£349,950 (−£15,000) · now 5.8% net
- Gone2-bed flat, W13Marked under offer by the listing
- No longer fits1-bed flat, W13Price rose above your limit
Illustrative screen. Figures are examples.
Works with your agents.
Viiyoo speaks the Model Context Protocol. Connect the AI assistant your team already uses and it can resolve properties, run rent and portfolio assessments, read market trends and manage scouts, all from Viiyoo's figures.
- 29 tools over MCP, plus a versioned REST API with an OpenAPI contract, idempotent writes, bulk exports and a change feed.
- Figures checked before they reach you. An agent's draft is checked number by number against Viiyoo's results, and agents are told to quote figures, never recompute them.
- You stay in control. Scoped keys with quotas and expiry, per-key activity, alerts on runaway use, one-click "pause all access", and connections a person approves.
- Safe by design. Text from your own files is treated as data, never as instructions to the agent.
you › Did any of my scouts find something new today? → viiyoo.list_changes(since: "yesterday") → viiyoo.get_latest_scan(scout: "W13 & UB6 flats") assistant › Two new matches and one price cut. The strongest is a 2-bed flat in W13 at 6.1% net, 7% below recent nearby sales. → viiyoo.check_figures(draft) ✓ 3 of 3 figures confirmed
Illustrative. Available to early-access teams.
And everything underneath the decision.
More of what Viiyoo does today. Screens are illustrative; figures are examples.
A value you can walk someone through.
Viiyoo finds nearby sales, matches floor areas from the EPC register, adjusts each for time with the UK House Price Index and removes outliers. The result is a central figure, a range and a confidence level, and it widens the range when the evidence disagrees.
| # | Sale | Area | Price | £/m² (adj.) |
|---|---|---|---|---|
| 1 | 3 months ago · 0.3 mi | 71 m² | £629,500 | £8,940 |
| 2 | 7 months ago · 0.4 mi | 64 m² | £585,000 | £9,210 |
| 3 | 10 months ago · 0.4 mi | 70 m² | £640,000 | £9,260 |
What's around it, from the people who record it.
Viiyoo asks official open sources about the exact location when you need it: flood risk and warnings, conservation areas, Article 4 directions, listed buildings, tree preservation orders, street-level crime and Census tenure. Each fact is dated and named, and a source that fails to answer is reported, not hidden.
| Check | Result | Source |
|---|---|---|
| Flood zone | Zone 1 · low | Environment Agency |
| Conservation area | Inside | planning.data.gov.uk |
| Article 4 direction | None at point | planning.data.gov.uk |
| Street crime, 3 months | Recorded within 1 mile | data.police.uk |
| Private renting, LSOA | Share of households | Census 2021 |
The lease, read. The clause, quoted.
Upload a lease, a survey or a management pack. Viiyoo pulls out the terms that matter (ground rent, term, service charge, restrictions) and shows the exact words from the page they came from. If the words aren't in the document, the term isn't claimed.
What a home should let for, and how sure we are.
Viiyoo picks comparable rentals under your organisation's own versioned methodology, applies the Local Housing Allowance rate in force on the day, runs several rent models and gives a 0–100 confidence score with its basis. The result is an evidence pack you can hand on.
Below the minimum sample, a market figure is withheld with the reason.
Every home checked, every exception explained.
Import a portfolio from a spreadsheet, with saved column layouts. Viiyoo resolves and assesses every home against your methodology, keeps a ledger of each rule it applied, lists the exceptions and produces an assurance pack ready for a funder or board.
| Rule | Pass | Exceptions |
|---|---|---|
| Rent within 10% of LHA | 205 | 9 |
| At least 5 comparables | 212 | 2 |
| EPC rating E or better | 210 | 4 |
Where a requirement can actually be met.
Lettings and sales by local authority, ward or postcode district, with maps and monthly trends, refreshed nightly. The scenario modeller takes a requirement, such as a number of homes at a rent ceiling, and shows where the market can supply it.
Requirement: 40 two-bed homes a quarter at up to £1,700 a month
| Area | Lets / month | Median rent | Fit |
|---|---|---|---|
| Area A | 62 | £1,650 | Meets |
| Area B | 71 | £1,740 | Partly |
| Area C | 48 | £2,050 | No |
Is the asking price supported?
The asking price is 6% above the estimated value calc. The three closest sales of similar two-bedroom flats in the last year sold between £585,000 and £640,000 123. The flat sits inside a conservation area 5, which limits external changes.
Answers that show their working.
Ask Viiyoo a question in plain English. It answers only from the evidence on the property, and every sentence points to the record or calculation behind it. An answer it can't support never reaches you.
- Calculations aren't done by AI. Money figures come from tested code and are labelled as such.
- Too little evidence? It says so. Figures below the minimum sample are withheld, with the reason.
- Works with your AI assistant. Viiyoo can connect to assistants that support the Model Context Protocol, with the same rules applied.
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.
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.
Try Viiyoo on your next deal.
Early access is open to a small group of investors, lenders and advisers in England, Wales and Scotland.