Accounting firms and bookkeepers
Serve more clients without hiring more people.
- Every administration run from one agent
- Onboard a new client in an afternoon
- Time freed up for advice instead of data entry
AI bookkeeping agent for purchase invoices
Purchase invoices in. Squared books out.
Vierkant reads every invoice that lands in your inbox, picks the right ledger account, runs it past eight safety checks and prepares it in Moneybird. It only books on its own when it is 100% certain. Everything else waits for one click from you.
Up to 90% less data entry
8 safety checks per invoice
No code per new client
Purchase invoices · today
Live
38Received
33Prepared or booked
5Waiting for you
Example data for illustration
Works with
- Moneybird Live
- Gmail & IMAP Live
- Basecone Soon
- Exact Online Soon
- eBay Soon
The problem
Invoice processing is the most expensive work nobody wants.
Processing one purchase invoice by hand easily takes a few minutes. Multiply that by every supplier, every client and every month.
- 0:30Open the mail, download the PDF, filter out reminders and newsletters
- 1:00Copy supplier, invoice number, date, amounts, VAT and IBAN
- 1:00Choose ledger account and VAT code, look up how it was done last time
- 1:30Upload, check for duplicates, match and archive
What would you get back?
22.7hours back per month
272hours per year
€12,240saved per year
Estimate based on your own inputs. The real share depends on your supplier mix and booking history; shadow mode measures it before you commit.
How it works
From inbox to ledger in six steps.
Every step is logged, so you can always see why an invoice ended up on an account.
01
Collect
Invoices arrive by email, Basecone or a marketplace. Vierkant recognises them by subject, body and attachment, and leaves the newsletters alone.
02
Read
AI extraction pulls supplier, invoice number, dates, amounts, VAT and IBAN from the PDF, even from messy layouts.
03
Classify
A four-layer cascade picks the ledger account: your own booking history first, then your rules, then AI, and only then you.
04
Check
Eight hard checks run before anything is booked: certainty, IBAN fraud, amount, duplicates, scan quality and history.
05
Prepare
The invoice and PDF are ready in Moneybird with the booking filled in. You approve, or Vierkant books itself when everything is 100% right.
06
Reconcile
A daily check raises the alarm if a processed invoice is missing from the books. Nothing slips through the cracks.
Safety first
100% certain, or it waits for you.
Most tools gamble on a confidence score. Vierkant only books on its own when the decision comes from your own history or an explicit rule and all eight checks pass.
L1
Booking historyHow was this supplier booked before?
L2
Explicit rulesYour fixed rules per supplier or keyword.
L3
AI suggestionA reasoned suggestion, always for review.
L4
YouOn your review list, with all the context attached.
Safety gate8 / 8
- Decision sourceHistory or rule, never AI alone
- Full certaintyNo doubt between accounts
- Minimum historyEnough prior bookings for this supplier
- IBAN fraud checkBank account belongs to this supplier
- Amount sanityWithin the normal range
- No duplicateNot processed before
- Scan qualityNo photo or scan with unreliable data
- Volume limitCap per run, against cascading errors
Start in shadow mode
Vierkant runs alongside your team for weeks and only logs what it would have done. Compare, and switch on automatic booking only when the numbers convince you.
Features
Built by a controller, for people who have to stand behind the numbers.
Smart inbox triage
Reminders, dunning notices and portal invoices are labelled automatically, so urgent items never get buried.
Just ask
A chat assistant knows your mailbox, your books and your review list.
> Has the Hosting Noord invoice been processed?
Yes, prepared on 4 Oct to 4410 Hosting.
Yes, prepared on 4 Oct to 4410 Hosting.
Learns from your history
At onboarding Vierkant reads your past bookings. It books the way you always have, from day one.
One config per client
Adding a new administration means filling in one config file. No custom code, no implementation project.
Duplicates and reconciliation
Deduplication prevents double bookings. Daily reconciliation catches anything that got stuck along the way.
Full audit trail
For every invoice you see which layer decided and which checks passed. Ready for your auditor and your internal controls.
Who it's for
One agent, two kinds of teams.
SMEs and finance teams
A faster month-end close with the same team.
- Accounts payable always up to date
- Fraud checks on every bank account
- Documented controls for your auditor
Comparison
More than recognition. Actual processing.
| Manual | Scan & recognition tools | Vierkant | |
|---|---|---|---|
| Collect invoices from your inbox | You | Usually forward manually | Automatic, with triage |
| Choose the ledger account | You | Suggestion | 4-layer cascade with reasoning |
| IBAN fraud check | If you remember | Varies by tool | On every invoice |
| Book autonomously | — | Varies by tool | Only at 100% certainty |
| Trial run without risk | — | — | Shadow mode |
| Ask for status in plain language | — | — | Chat assistant |
Pricing
Pay per administration. Not per hour.
Indicative launch pricing, excl. VAT. Every plan starts with a free shadow period.
Solo
For freelancers and small businesses
€39 / month
- 1 administration
- Up to 150 invoices per month
- Inbox triage and chat assistant
For firms
Practice
For accounting firms
€29 / administration / month
- From 5 administrations
- Unlimited invoices per administration
- Guided onboarding per client
Enterprise
For finance teams with their own systems
Custom
- ERP and Exact Online integrations
- Custom rules and approval flows
- Dedicated contact person
FAQ
Frequently asked questions
Does Vierkant book invoices without my approval?
Only if you switch automatic booking on yourself, and then only when all eight checks pass and the decision is 100% certain. Everything else is prepared for one-click approval.
Which accounting platforms does it work with?
Moneybird is live. Exact Online and Basecone are in development. Invoices can come in from Gmail or any IMAP mailbox.
What happens if the AI gets it wrong?
An AI suggestion is never booked on its own. It goes to your review list. Your correction becomes history, so the same supplier can be handled automatically next time.
How is my data secured?
API keys are stored encrypted and never in code. The first connection is read-only, and every action is logged. Processing happens under a data processing agreement in line with the GDPR.
How long does onboarding take?
Usually one afternoon per administration. Vierkant learns from your existing bookings, then runs in shadow mode until you are confident.
Do I need to change how I work?
No. Suppliers keep emailing the same address, and you approve in the platform you already use.
Let your books square themselves.
Book a 20-minute demo. We run Vierkant on a sample administration, then on yours in shadow mode.