Softwr

Accounting · head to head

Fortnox vs Karbon

Fortnox logo

Fortnox

Accounting

Swedish cloud accounting and business platform for bookkeeping, invoicing and payroll

From
Free
Rated
-
Full reviewWebsite
Karbon logo

Karbon

Accounting

Practice management for accounting firms

From
$59/month
Rated
-
Full reviewWebsite

The short version

  • Only Fortnox has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fortnox corporate packages alone span at least 7 named tiers (Mini through Stor+) priced from 209 kr/man to 919 kr/man, and add-on programs are billed separately per module (SEK); Karbon monthly billing option only available for teams of 4 or more users
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Fortnox and Karbon actually diverge.

Attributes where Fortnox and Karbon differ
AttributeFortnoxKarbon
Starting priceFree$59/month
Free tierYesNo

Identical on both: pricing model (subscription), platforms (Web), user rating (Not yet rated), category (Accounting).

What people use each for

The jobs each tool is most often brought in to do.

Fortnox

  • Registering Swedish corporations with guided formation assistancenot Karbon
  • Selling unpaid invoices to improve cash flownot Karbon
  • Managing multiple client businesses from bureau dashboardnot Karbon
  • Integrating payroll with Swedish banking automationnot Karbon

Karbon

  • Automating client document collection for tax practice intakenot Fortnox
  • Tracking all client requests in workflows tied to jobsnot Fortnox
  • Aligning hours worked with billable time per engagementnot Fortnox
  • Automating period close by connecting practice management to accountingnot Fortnox
  • Streamlining client document submission and approval workflowsnot Fortnox

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Fortnox

  • Corporate packages alone span at least 7 named tiers (Mini through Stor+) priced from 209 kr/man to 919 kr/man, and add-on programs are billed separately per module (SEK)
  • The Fortnox Access verification tier is priced by transaction volume, rising from 9 kr/man at zero verifications to 199 kr/man at 1000+ verifications (SEK), so cost is not fixed and scales with usage

Karbon

  • Monthly billing option only available for teams of 4 or more users
  • Team plan at $59/month per user minimum cost may be expensive for smaller practices
  • No seat license discounts published; scaling costs linearly with user count

Pricing, plan by plan

Fortnox

Free
  • New Company TrialFree
    • 6-month free trial for newly started businesses

Karbon

$59/month
  • Team$59/month
    • Per-user pricing
    • Designed for small accounting firms
    • Minimum team size of 4 for monthly billing
  • Business$89/month
    • Per-user pricing
    • Workflow automation
    • Integrations for growing practices
  • Enterprise$null/mo
    • Custom pricing
    • Tailored for large accounting firms
    • Dedicated support

Which should you pick?

Choose Fortnox if

  • You want to start without paying.
Fortnox review

Choose Karbon if

Nothing in the data separates Karbon from Fortnox on the points above - pick on price and on how each one feels to use.

Karbon review

Questions people ask

Is Fortnox or Karbon better?
Neither clearly leads. Fortnox starts at Free and Karbon at $59/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fortnox or Karbon?
Fortnox has a free tier; the other does not. Paid plans start at Free for Fortnox and $59/month for Karbon.
Does Fortnox or Karbon run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Fortnox for free?
Yes. Fortnox has a free tier, so you can try it without paying. Karbon starts at $59/month.
What is Fortnox best used for?
Fortnox is most often used for registering swedish corporations with guided formation assistance, selling unpaid invoices to improve cash flow, managing multiple client businesses from bureau dashboard, integrating payroll with swedish banking automation. Of those, registering swedish corporations with guided formation assistance and selling unpaid invoices to improve cash flow are not what Karbon is typically brought in for.

Answered from the vendors’ own pages

Fortnox: Does Fortnox offer a free trial?

Yes, newly started businesses receive their first six months in Fortnox at no cost, followed by subscription-based pricing.

Source
Karbon: How much does Karbon cost?

Karbon pricing starts at $59 per user per month (Team plan, billed annually) or $79 per user per month (monthly billing for 4+ users). Business plan is $89/month annual or $99/month monthly. Enterprise pricing is custom.

Source
Fortnox: What pricing tiers does Fortnox offer?

Fortnox offers tiered subscription packages that vary by module (accounting, invoicing, payroll) but specific pricing details are not listed on the main website.

Source
Karbon: Is there a discount for annual billing on Karbon?

Yes, Karbon offers annual billing at a discount compared to monthly. Team plan is $59/month annually versus $79/month monthly. Business plan is $89/month annually versus $99/month monthly.

Source
Fortnox: How can I find Fortnox pricing information?

Detailed pricing is available on the packages page (/paket), through a purchasing guide tool at buy-guide.fortnox.se, or by contacting sales representatives directly.

Source
Karbon: What is the minimum user requirement for monthly billing on Karbon?

Karbon requires a minimum team size of 4 users to access monthly billing. Teams smaller than 4 must choose annual billing.

Source
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