The book
Capital deployed by position
Tile area is landed cost, colour is probability-weighted ROI, the small figure is the market's last sale against your base. Click a tile to open the position.
Command list
Realised profit by month
Dashed line is your monthly targetStock ageing
Days held, open positionsMarket pulse
What you hold and what you watch, marked against the market this morningDeal Lab simulated market data
Describe the item and the price you think it sells at. Sizemill pulls live and sold comps from four marketplaces, strips the fakes, and tells you whether your number is right before you spend a pound.
Underwrite a supplier list
Market simulated market data
Price history for anything in the catalogue. Pick a product and a window; the table shows how it has moved over every horizon at once.
Change by horizon
Last sale then vs nowVerdict
Price construction
A mark should show its inputsNormalised comp set
Size premium
Last sale by size against the product averageWhere the data comes from
Watchlist simulated market data
Things you don't own yet. Set the price you'd buy at and Sizemill tells you the morning the market gets there.
Board memo
The board's review of the two builds, what it resolved, the roadmap, and — because it matters more than the ideas — which data feeds are real, which are restricted, and what they cost.
Two builds, one table
Board review of 6 September 2026. A is this build, B is the outside build.Resolutions of the board
What changed in v3 because of the reviewData feeds, checked
Status as of September 2026. Verify before building; terms change.Feature roadmap
Ranked by value to a reseller doing under 100 orders a month, which is most of the sectorRunning cost at 10 members
What the board would ask
Positions
Every pair and piece you hold, priced three ways. Click a row to edit, drop in a photo, or mark it sold.
Add position
Type the price you paid and three prices you believe in. Everything else is computed as you type.
Scenarios
Weight how likely each outcome is and the whole book reprices: expected value, expected ROI, and the tax you would owe on it.
Probability weights
Book under each scenario
Open positions, net of fees and outbound shippingPer position
Bars show where each scenario lands against landed costTax engine
Profit is shown before and after tax everywhere in Sizemill. The rate moves by itself as your projected annual profit crosses a band.
Where you sit this year
Tax reserve
Money you should not touchSizemill suggests moving the marginal rate of every realised profit into a separate pot on the day of sale. Shortfall is what you owe on this year's profit minus what is already set aside.
VAT radar
Rolling 12-month turnoverThreshold and the second-hand margin scheme are set in Settings. Check the current threshold with your accountant; it moves.
Bands in use
Cash rule per £1,000 realised
Reserve first, then reinvestCapital efficiency
Velocity return on the open bookCash unlock queue
What to sell first if you need buying powerClient desk
Every client as a book of its own: what they buy, how often, what they pay, what they owe, and the one thing worth doing today. Direct sales with a relationship behind them are the highest-margin channel you have.
Today
Gross profit by tier
Realised, all timeInvoices and money owed
Record payments as they land; the last one marks the stock soldSourcing requests
Every "can you get me…" message becomes a card. Move it right as you source, quote, buy and deliver. Margin is estimated before you spend a pound.
Connections
Where stock gets seen, sold and paid for. Every row says plainly whether it is live; the Test button talks to the real endpoint and reports what came back.
Daily brief
Effort this month
Progress to target
Sizemill for resellers
The same book, sold to other resellers and personal shoppers. Multi-workspace, benchmarked against the cohort, and white-label for agents who manage several players.
How you compare
Anonymised cohort, last 90 days (illustrative)Benchmarks are the product. Nobody else can tell a reseller their ROI is in the 38th percentile for Jordan 4s and that their average days-to-sell is double the cohort.
Workspaces
Switch from the railProposed pricing
Starting point, not a decisionLedger
Every pound in and out, in order, and never edited. Cash on hand is the sum of this table, not a number you type. Mistakes are reversed with a new entry, so history stays true.
Analytics
Where the profit came from and where it didn't. Realised sales only; expectations live on the book.
Profit by brand
realisedProfit by channel
net of feesProfit by client tier
who is worth the effortMargin by month
realised profit as a share of revenueDays to sell
realised, by brandPricing accuracy
where sales landed against your three pricesSize performance
realised profit and count by sizeNetwork
Requests you can't fill matched to stock other members hold, and other members' requests matched to yours. Members stay anonymous until both sides accept; Sizemill takes a fee on the match.
Your requests, their stock
Fill an order without buyingTheir requests, your stock
Demand you didn't have to findHow the network works
Automations
Rules that act, not just warn. Each one shows what it would do before it does it, and everything it does lands in the ledger.
Dry run
What the enabled automations would do right nowData room
The raise, as a working model. Every number here is an assumption you can change; nothing is a claim about the market that hasn't been marked as one.
Revenue model
Three tiers, thirty-six months, logistic ramp to the member targets you setUse of £5,000,000
Twenty-four months of runway to the Series A metricsMilestones and what they unlock
Market, as assumptions
Change them; the sizing recomputesWhy this wins
Team to hire
Risks the board will raise
Product spec
Every feature in the product, in detail: what it is for, how it is computed, the data it needs, the feed it depends on, and where it stands. Open any card.
Settings and customise
Fee schedules, defaults, your own fields and columns, and the rules behind every alert. Every number here flows through the whole book.