Fortnox + AI · Claude · ChatGPTAsk your books.
Get answers — not menus.
Nordsynk connects Fortnox to Claude, ChatGPT, and other AI clients — for one company or your whole client list. Ask, create invoices, approve and post in plain language. In the default browser-approval mode, writes wait for your explicit approval; you can allow confirmed writes per company in the dashboard.
Purchased via Fortnox Marketplace or a Nordsynk agreement · browser approval by default; per-company auto-approve available · full audit history
Customers
Teams using Nordsynk with Fortnox
New · Free tool
Five questions from your SIE4 file — in under a minute.
Månadskoll highlights the month’s movements and prepares the questions a finance lead or accounting firm should take into the next review. The tool is currently in Swedish.
No sign-in · your file never leaves the browser
Fortnox Marketplace
One or a few of your own companies
Activate directly in Fortnox Marketplace — 199 SEK per Fortnox company and user per month.
Get startedNordsynk agreement
Accounting firm with client companies
490 SEK base fee + 149 SEK per active connected client company per month — all consultants included, and disconnected companies are not billed.
Not just a question. The whole workflow.
From question to approved write, month close, and report — all in one chat, always with the right company and period.
Ask and analyze
Ask about ledgers, balances, periods, and discrepancies and get answers right in the thread. Nordsynk keeps the company, interval, and fiscal year explicit before any figures are read.
› Which customer invoices are unpaid in March?
Read about Fortnox AI integrationCreate, post, and approve
Describe what should happen — a customer invoice, a voucher, or the supplier flow with inbox, OCR, and attest. In the default browser-approval mode, each write is shown as a preview you approve before anything is posted; the dashboard can allow confirmed writes per company.
› Book rent 12 500 to 5010 / 1930
Read about the Fortnox APIMonth close and K2 annual close
Run the month close with the company, exact interval, and fiscal-year boundary explicit throughout. The K2 annual-close flow gathers focused evidence for one selected company and fiscal year — clearly reporting any checks that are unavailable.
› Reconcile June and list anomalies
Read about the Fortnox MCP serverReport and export
Pull reports and SIE files for the financial year, or send large datasets straight to Google Sheets with Nordsynk DataLink — without the rows passing through the AI client.
› Export SIE for financial year 2025
SIE export via the Fortnox APISame task. Two ways.
- 01Open Fortnox
- 02Bookkeeping → Chart of accounts
- 03Open account group 50
- 04Filter period: March
- 05Scroll the list
- 06Tally totals by hand
4 vouchers, 36 600 kr in total — 2 rent, 1 cleaning, 1 repair. Want to see them per supplier?
“Works absolutely perfectly! I've built a complete CFO assistant on Claude with full access to Fortnox through Nordsynk. She does reports, double-checks the bookkeeping, pulls data. I use it all the time – highly recommended!”
“Saves us a huge amount of time and headaches. Finding things in Fortnox used to take us hours – now we get the same answers in minutes. If you're not using this in 2026, you're far behind.”
One conversation, many steps.
Nordsynk handles follow-ups, comparisons, and actions in the same conversation — and in the default browser-approval mode, each write waits for your approval.
Show voucher A-247
A-247 — rent invoice, 12 500 kr: • Debit 5010 (Premises rent) — 12 500 kr • Credit 1930 (Bank giro) — 12 500 kr No receipt attached.
Find the receipt in Inbox
Found rent-invoice.pdf in Inbox (Mar 1, 12 500 kr). Attach to A-247?
Yes — attach it.
Attach rent-invoice.pdf to voucher A-247
Done. The receipt is attached to A-247 — nothing was written before your approval.
Answers with sources — not guesses.
Nordsynk researches accounting questions against a maintained corpus of official Swedish rules and Fortnox guidance, instead of relying on model memory.
Sources kept apart
Law, Bokföringsnämnden material, Skatteverket guidance, and Fortnox product documentation are combined while keeping their authority levels separate.
The right framework for the right company
Entity type, accounting framework, effective dates, and the selected fiscal period are checked before evidence is treated as applicable.
Honest when sources fall short
Answers cite precise sources — and when the published sources do not support a confident answer, Nordsynk says so instead of guessing.
The source corpus is maintained continuously. Nordsynk does not replace an auditor or accounting consultant — and says when the sources are not sufficient.
Example · source-grounded answer
No. A company applying K2 may not recognize internally generated intangible assets — the costs are expensed as incurred. K3 may permit capitalization of development costs when its recognition criteria are met.
Built for the person who approves the tool
Nordsynk is designed for firm leads and finance managers who need control before the team gets access.
Fortnox OAuth 2.0
No passwords stored. Each user authorizes through Fortnox’s own login flow.
Company access per user
The company is chosen explicitly per request — there is no preselected default company. In a firm workspace, access is set per member and client company: read, write, or admin, and sensitive areas like payroll can be blocked.
Write approvals and delegation
In the default browser-approval mode, each write shows a preview that is approved individually or as a batch. A pending approval can be delegated to a consultant with write access. If auto-approve is enabled for a company, a confirmed write can execute immediately instead.
Audit trail
Every call and approval is logged with user, company, timestamp, and action — the history can be reviewed afterwards.
What customers do with Nordsynk
Concrete everyday jobs — in the tool you already have open.
Reconcile the month
“Run the June month close for Bolag AB.” Nordsynk reviews the period with an explicit interval and fiscal-year boundary, checks the ledgers, and flags anomalies in a checklist.
Send the ledger to Google Sheets
“Create a DataLink for financial year 2025.” After your approval, the spreadsheet pulls the full dataset straight from Nordsynk — the rows never pass through the AI client.
Work across companies
“Which clients have customer invoices more than 30 days overdue?” Nordsynk gathers evidence from the companies you explicitly select and summarizes it in one answer — no switching logins.
Find and attach documents
“Find the receipt for A-247 and attach it.” Nordsynk searches the archive and inbox, shows the document in the client, and attaches it to the right voucher — after your approval.
Collaborate with your accountant
“Send this question to our accountant.” Questions and pending write approvals can be routed to a named consultant with access to the company — nothing executes until the consultant approves.
Follow up time per project
“List time registrations per project for last month.” Nordsynk fetches registered time from Fortnox with project filters and summarizes it per project or customer.
Built for firm client work
The whole team works against clients' Fortnox in one shared workspace: access is set per member and client company, write approvals can be delegated to the right consultant, and every event lands in the firm's audit history.
Price
149 SEK / active client company / month
Minimum agreement
Starts at 937 SEK/month — base fee + 3 active client companies
Consultants and users
Included
Frequently asked questions
Two ways to buy. One product.
Fortnox Marketplace for individual companies, or a Nordsynk agreement when one team works across many Fortnox companies.
For companies
per Fortnox company and user / month
Billed via Fortnox Marketplace
- Full Fortnox API surface over MCP — 377 operations
- Works with Claude, ChatGPT, Cursor, and any MCP client
- Hosted MCP server — no self-hosting
- OAuth 2.0, approved scopes, and audit log
Nordsynk agreement · For accounting firms
per active client company per month
Billed through a Nordsynk agreement · Starts at 937 SEK/month excl. VAT, base fee included.
- One bureau or group workspace for all connected Fortnox companies
- Team roles, company-level access, and audit history
- Supplier-invoice inbox, OCR, comments, attest, and approval workflows
- No seat price — the whole team is covered by the base fee.
Ready to stop clicking?
Activate Nordsynk in the Fortnox portal and give your team access today.