Fortnox + ClaudeAsk your books.
Get answers — not menus.
Ask Claude which supplier invoices to pay this week, how the month went or what is left to close. Nordsynk connects Claude to your Fortnox. Also works with ChatGPT.
Want to see it work first? Try it on a demo company
199 SEK per company and user per month, so for you in your company. You buy it in Fortnox Marketplace.
Customers
Companies using Nordsynk with Fortnox
“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.”
“A really smooth integration between Claude and Fortnox! Nordsynk makes it easy to work with financial data directly in Claude, without jumping between systems.”
“Saves time, works extremely well and everything just works. It's also reassuring that nothing changes in Fortnox unless you approve it yourself.”
4.2 out of 5 in Fortnox Marketplace, 15 reviewsReviews on the Fortnox marketplace
What you would otherwise dig out of Fortnox
Write the question the way you would ask a colleague. Claude fetches the answer from Fortnox.
What to pay this week
› Which supplier invoices should I pay this week?
Unpaid and due supplier invoices sorted by due date, with the total you need cash for.
How the month went
› How did October go compared with October last year?
Revenue, costs and result side by side, with the items that differ most.
Invoices in and out, month closed
› Which customer invoices are unpaid, and what is missing before I can close October?
Unpaid customer invoices, supplier invoices waiting for attest and deviations to fix before the month close.
Running an online shop, a store or a wholesale business? See how Nordsynk fits
Nothing changes in Fortnox until you have approved it.
Claude can propose a posting, an attest or an invoice. You see a preview and approve each change before it is made.
You see what changes
The preview shows accounts, amounts and documents before anything is posted.
You sign in through Fortnox
No passwords are stored. You connect with your own Fortnox account and Nordsynk follows your permissions.
Everything is logged
Every call and approval is saved with user, company and time, so you can review it afterwards.
Security and data handlingRead how Nordsynk handles your data
Three steps, a few minutes
- 01
Buy Nordsynk in Fortnox Marketplace
Pick your company and buy a seat. It costs 199 SEK per Fortnox company and user per month and appears on your regular Fortnox invoice.
- 02
Assign the seat to whoever will use Claude
The seat sits on a Fortnox user. Assign it under Administrera integrationer in Fortnox. If someone other than you will use Claude, assign the seat to that person.
- 03
Connect Claude
Sign in with your Fortnox account and add Nordsynk to Claude. The setup guide shows every step.
199 SEK per company and user per month
That is the price for you in your company, on your regular Fortnox invoice. A colleague or another company needs its own seat.
For companies
per Fortnox company and user / month
Billed via Fortnox Marketplace
- Works with Claude, ChatGPT, Cursor, and other AI assistants
- We run the connection — you install nothing
- Sign-in through Fortnox, approved permissions, and an audit log
Frequently asked questions
Does Nordsynk store our accounting data?
Nordsynk fetches data from Fortnox when you ask for something, and no passwords are stored. Some workflows keep what the service needs: data for reports and exports (removed after 30 days without use), change proposals and the decisions on them, and files you send through the assistant, which are normally deleted once Fortnox has received them. For accounting data, Nordbeam AB is the data processor and you are the data controller. See the privacy notice for details.
Can the AI change anything without me knowing?
No. A change only starts when Claude proposes it, and by default you see a preview and approve before anything is posted. You can enable auto-approve per company if you want. Payroll and HR can be blocked entirely.
How is a license counted?
One seat per Fortnox company and user, 199 SEK per month. You buy the seat in Fortnox Marketplace and assign it to whoever will use Claude. One user across 10 Fortnox companies = 10 seats (1,990 SEK/month).
I have several companies. How does it work?
Each company needs its own seat for every user who will use Nordsynk there. Three companies and one user are three seats: 3 × 199 SEK = 597 SEK/month. No single seat covers several companies.
Which AI assistants work?
Claude (Claude Desktop, claude.ai and Claude Code) and ChatGPT. Cursor and other AI assistants that can connect to a remote server also work. You sign in with your Fortnox account and choose which companies Nordsynk may reach.
How do I connect Claude or ChatGPT to Fortnox?
Buy Nordsynk in Fortnox Marketplace and assign the seat to whoever will use Claude. Then add the address https://mcp.nordsynk.se/mcp as a custom connector in Claude, ChatGPT or Microsoft Copilot Studio. You sign in with your Fortnox account, with no API key and no server of your own. It takes about three minutes; the setup guide shows every step with screenshots.
How is Nordsynk different from other Fortnox MCP servers?
Nordsynk is a hosted MCP server that covers the entire Fortnox API, plus ready-made workflows for supplier invoices with OCR and attest, customer invoices, SIE export and more. By default, each change opens a browser approval preview; a company can enable auto-approve for immediate execution. Activity is logged. Compared with an open-source MCP server, there is nothing for you to host, secure or update.
Free tool
Five questions from your SIE4 file — in under a minute.
Månadskoll shows the month’s movements and the entries worth a closer look before you close the month. The tool is in Swedish.
No sign-in · your file never leaves the browser
Do you work at an accounting firm? There is a separate agreement for firms.
AI for accounting firmsReady to ask your books?
Buy Nordsynk in Fortnox Marketplace, assign the seat and ask Claude. It takes a few minutes.