The margin you gave away, found, with the letters already written.
Devion reads your purchase and sales exports, finds where supplier costs outran your prices, totals the margin you absorbed, customer by customer, and writes the letters to win it back.
Free to start · No card needed · Your data stays yours
1,240 products matched
across both ledgers
+18% cost rise detected
not passed on
41 letters drafted
ready to send
Margin leak report
Ashworth Trade Supplies · last 12 months
Absorbed in the last 12 months
£0.00£31,600 annualised at the current run-rate
Coverage
0%| Customer | Cost | Passed on | Absorbed |
|---|---|---|---|
| Hartley & Sons | +18% | £2,140.00 | |
| Meadow Facilities | +14% | £1,685.50 | |
| Crossgate Trade | +22% | £1,329.00 | |
| R. Nolan Plumbing | +11% | £960.40 |
The problem
Absorbed cost increases don’t announce themselves.
The leak is invisible
A 6% supplier increase you didn't pass on shows up on no report. It just quietly becomes your problem at year end.
Passing it on is awkward
Nobody enjoys writing “we're putting our prices up” letters, so the increase gets absorbed by default, customer after customer.
Spreadsheets can't keep up
Thousands of lines across dozens of customers and suppliers. Gut feel misses it; a manual reconciliation takes days you don't have.
A worked example
One line, one customer, £2,140 gone.
This is the exact shape of a leak Devion catches. A supplier put a product up over the year; the price to one customer barely moved. The difference, multiplied by everything they bought, is money you never billed.
The cost you paid
£42.00 to £49.56
Your supplier lifted this line +18% across the year, in steps you never really clocked.
The price you charged
£57.00 to £60.42
Hartley & Sons only saw +6%. The other twelve points of cost quietly became your problem.
What you absorbed
£2,140.00
On this one line, on this one account, in a year. Devion totals it across every line and every customer, then writes the letter.
How it works
Three passes over your numbers, done in minutes, not days.
Devion links both ledgers
Devion links the same physical product across your purchase and sales exports, through different codes, spellings and pack sizes, so cost and price line up.
Devion finds the gap
For every product and customer, Devion checks whether your selling price kept pace with the supplier cost, and totals what you absorbed when it didn't.
Devion writes the letters
A price-adjustment letter for each affected customer, in your voice, citing the increase as a band, never your costs. Ready to copy, email or download.
What it does
A report you can act on this afternoon, not a project.
Devion isn’t pricing software with a rollout and a consultant. It’s two files in, one report and a stack of letters out.
Cost-rise detection
Finds sustained supplier cost increases per product and ignores one-off blips, so you act on a real trend.
Pass-through gap
Checks, customer by customer, whether your selling prices actually moved with the cost, or quietly didn't.
Absorbed, in pounds
The headline is money, not a percentage: exactly what each price rise cost you when it wasn't passed on.
Letters, already written
A price-adjustment letter for every affected customer, copy or download to send.
Honest coverage
We show what share of your sales we could match to a purchased item, so you know how far to trust the figure.
Built for UK trade
VAT-aware and GBP throughout. It speaks builders' merchant and wholesaler, not enterprise procurement.
The output
The letter, already written.
Finding the money is half the job. For every affected customer, Devion drafts a price-adjustment letter in your voice, ready to review and send.
- Written in your tone, firm but courteous, or softer if you prefer
- Cites the increase as a band, never your costs or margin
- One letter per affected customer, not a mail merge to everyone
- Copy or download to send from your own email
Subject
Important Notice: Pricing Adjustment Effective 5 August 2025
Dear Hartley & Sons,
I am writing to let you know about an upcoming adjustment to the pricing on a number of the product lines you buy from us.
Over the past year we have absorbed sustained increases from our own suppliers, of between 11% and 18% on the lines affected. We have held our prices to you for as long as we reasonably can, but can no longer do so in full.
From 5 August 2025, prices on the affected lines will rise by a modest amount, well below the increase we have taken on. Your account manager will be glad to walk you through the detail.
With thanks for your continued custom,
Who it’s for
Built for merchants who buy and resell.
If your margin is the gap between a supplier invoice and a customer invoice, and that gap has quietly been narrowing, Devion is for you.
Builders' merchants
Timber, boards, cement, insulation, fixings, the classic absorbed-margin trade.
Plumbing & heating
Copper, boilers, radiators and fittings, where supplier prices move constantly.
Timber & sheet materials
MDF, ply, OSB and softwood, priced by the sheet and repriced often.
Electrical wholesale
Cable, consumer units and accessories, thin margins on high volume.
Landscaping & aggregates
Paving, aggregates and hard landscaping sold by the load.
Industrial & fixings
Fasteners, abrasives and consumables across hundreds of lines.
Defensible by default
A number you can put in front of anyone.
Every finding shows its working, the cost series, the price change and the quantity behind it. No black box, and a coverage figure so you always know how complete the picture is.
Privacy-first
We analyse net figures. Your row-level data is never used to train anything and you can delete it whenever you like.
Your data stays yours
Two CSV exports in, one report out. No bank feeds, no accounting logins, no standing access to your systems.
Delete on demand
One click removes every upload, report and letter. It's your data and your call.
Pricing
Priced like a report, not a platform.
Start free. When you want the customer-by-customer picture and the letters, buy a one-off audit or subscribe, and the $129 audit comes off your first bill if you upgrade within 30 days.
Margin Leak Audit
$129one-off
A single, complete report. The honest way to find out if there's a leak worth fixing.
- One full analysis of your purchase & sales history
- Absorbed margin quantified, customer by customer
- A price-adjustment letter for every affected customer
- Copy or download to send, no mailbox access
- Coverage figure so you know how much we could read
Devion Monthly
$99per month
Run it whenever costs move. Re-check every quarter, after every supplier increase.
- Everything in the audit, up to 30 analyses a month
- Re-analyse as new exports come in
- Fresh letters each time costs change
- Customer memory and pass-through tracking across the year
- Cancel anytime, no tie-in
Devion Annual
$990per year
The same plan, billed yearly. Two months on us.
- Everything in Devion Monthly
- 2 months free versus paying monthly
- One invoice a year, not twelve
- Best for merchants who re-check every quarter
- Cancel anytime, stays active to your renewal date
All prices in USD, sold by Dodo Payments (Merchant of Record). See full pricing details
Questions
The things merchants ask first.
Do you contact my customers?
Never. Devion drafts the letters for you to review; sending is always your decision and your act. We have no access to your mailbox and send nothing on your behalf.
Is my data safe?
Two CSV exports in, one report out. We analyse net figures, never sell your data or use it to train anything, and you can delete every upload, report and letter in one click.
What if my exports are messy?
Devion maps your columns automatically, through different codes, spellings and pack sizes, and shows a coverage figure so you know exactly how much of your sales it could read.
How accurate is the number?
Every finding shows its working: the monthly cost series, the price change and the quantity behind it. You can trace any pound back to the lines that produced it.
Do I need to change my systems?
No rollout, no logins, no bank feeds and no standing access. Export your purchase and sales history from Sage 50, Xero or QuickBooks and upload the two files.
Can I cancel?
Yes, at any time. Any report you've already run and the letters generated from it stay available to you, whatever happens with billing.
Find your leak in about ten minutes.
Start with the free supplier cost check, upload your purchase history and see which costs rose. No card, no commitment.