Which one fits you?
For you working in a single Fortnox company. One licence per user and company, billed by Fortnox.
Claude Fortnox Connector 
ChatGPT Fortnox Connector Built for accounting firms and corporate groups working across several companies. One licence per user, unlimited companies, billed by Sidcom.
Fortnox AI Connector: Multi-Company Find invoices, see what's paid and pull the numbers, or run the whole books. In plain language, right inside ChatGPT. You approve in ChatGPT before anything is written to Fortnox.
Work across several companies? Fortnox AI Connector: Multi-Company covers them all on one license →
Integration partner Built by Sidcom, not published by Fortnox or OpenAI.
The ChatGPT Fortnox Connector links OpenAI's ChatGPT to your Fortnox account so you can run your books in plain language. Ask ChatGPT to find invoices, post entries or prepare VAT. ChatGPT proposes each change and asks for your approval before anything is written to Fortnox. It works in ChatGPT on web and desktop with a paid ChatGPT plan that has connectors enabled, from 99 SEK per user a month via the Fortnox marketplace.
// which_one_fits
Both connectors do the same things inside Fortnox. The difference is how many companies you work in.
You work in a single Fortnox company. You buy the license in the Fortnox marketplace and pay for it on your Fortnox invoice.
Per company. 30-day money-back guarantee.
The same people work across several Fortnox companies. One license covers unlimited companies, and you can ask across all of them at once.
Unlimited companies. 7 days free, no card.
If the companies already have a Fortnox integration license, Fortnox AI Connector is cheaper from around three companies, and considerably simpler to administer. Without one, each company needs its own, and this connector stays cheaper for longer.
// capabilities
Everything you'd otherwise dig through menus for is now a sentence away, in the ChatGPT apps you already use. You don't have to be an accountant.
Find customers, suppliers, invoices and amounts. Ask like you'd ask a colleague, without hunting through menus.
Which customer invoices fell due last month?
Create customer invoices, post entries and approve supplier invoices for payment. ChatGPT fills in the details, you approve before anything is saved.
Post the receipt I just uploaded.
Summarize, compare periods and surface key figures, without exporting to Excel.
How much did we invoice in Q1?
// at_a_glance
// security
Your books are stored in Fortnox and nowhere else. You control every action.
No passwords stored with us. All sign-in goes through Fortnox.
ChatGPT can do exactly what you can do in Fortnox, no more, no less.
ChatGPT proposes, and asks for your approval before writes are sent to Fortnox.
All changes are made through your own Fortnox user and show up in Fortnox as usual.
Sidcom is a Swedish company. No bookkeeping data is stored at Sidcom.
// connect
In ChatGPT, turn on Developer mode, add the address below as a custom connector and sign in with Fortnox on first use.
https://fortnox-chatgpt.sidcom.app/mcp Essentially all of Fortnox is available. ChatGPT can search customers, suppliers and invoices, see what's paid and unpaid, create customer invoices, post entries, approve supplier invoices for payment, and export bookkeeping data as SIE files. You approve every write in ChatGPT before it is sent. See the full module table, 22 Fortnox modules with exactly what you can do in each.
No. ChatGPT proposes changes and asks for your approval before writes are sent to Fortnox.
Yes. You sign in with Fortnox OAuth and Sidcom never stores your password. ChatGPT only acts within your existing Fortnox permissions, and all changes are made through your own Fortnox user and show up in Fortnox.
ChatGPT on web and desktop, on a paid plan: Plus, Pro, Business, Enterprise or Edu. It isn't available on Free or in the mobile apps yet. The same connection also works in any other MCP client.
On a personal Plus or Pro account, yes: custom connectors sit under Developer mode, which you switch on in Settings, Security and login. You then add the connector as a plugin under Settings, Plugins. On a Business, Enterprise or Edu workspace you don't: your administrator creates and publishes the connector (Apps, Create, Publish), then each member connects it from Apps and signs in with Fortnox.
A license is a user seat in one Fortnox company. If you use ChatGPT across several Fortnox companies you need a license per company. If those companies already have a Fortnox integration license, Fortnox AI Connector: Multi-Company is cheaper from around three companies, with one license covering unlimited companies. Without one, each company needs its own and that cost is on top, so do the math first. Fortnox checks your license and permissions each time you connect.
99 SEK per user per month via the Fortnox marketplace. No setup fees and no per-call charges. 30-day money-back guarantee.
Quick checklist: have you bought the license in the Fortnox marketplace and activated it via the activation link? No separate integration license is needed, this connector is bought from Fortnox. Then check the ChatGPT side: a paid plan on web or desktop, Developer mode on, and on a workspace that your admin has shared the connector. Otherwise test with only the "Company information" scope to rule out a license issue with one of Fortnox's other modules.
What you'd otherwise click through in Fortnox now takes a single sentence. Add ChatGPT Connector from the Fortnox marketplace and get going in minutes.
Activate in Fortnox