Comparison
Karbon excels at workflow automation and email management — but per-user pricing adds up fast. FirmFlow offers the core features most firms need at a fraction of the cost.
Karbon is a strong platform for firms that need its full feature depth. But three patterns show up consistently in firms that switch away.
Karbon charges €53-80 per user per month. A 5-person firm pays €3,180-€4,800 per year, and every new hire adds €600-€1,000 annually. FirmFlow stays at €29-€89 flat regardless of team size. For growing firms, this difference compounds fast.
Karbon requires paid onboarding packages for most firms. The learning curve is steep — checklists, workflows, triage rules, email integration all need configuration. FirmFlow is intentionally simpler and most firms are live in 20 minutes with no setup fee.
Karbon shines with larger accounting firms that need triage, email-driven workflows, and complex assignments. Small firms typically use a fraction of the features. FirmFlow focuses on what small firms actually need: documents, signatures, time, invoices, and a client portal.
For a typical 5-person firm, the total cost of ownership over 5 years looks very different.
Karbon
€15,900
over 5 years (5 users)
FirmFlow
€1,740-€5,340
over 5 years (Starter to Pro)
You save
€2,500+
over 5 years
Based on Karbon pricing at €53-80/user/month (5 users) vs FirmFlow €29-€89/mo flat. Competitor pricing from public pricing pages, April 2026.
Most firms complete migration in one afternoon. Here is the typical workflow.
Export contacts from Karbon to CSV — names, emails, company details. Import the CSV into FirmFlow in one step; all fields map automatically.
Download active documents and signed contracts from Karbon. Upload to FirmFlow, link to clients or engagements, and set visibility rules.
FirmFlow sends each client a branded invitation email with login details. Most firms do this as one email blast and are fully switched over within a week.
Need a hand? Send us a message — we help new firms migrate for free during the first 14 days.
FirmFlow is built for small firms (1-5 people) with flat pricing, simple setup, and the core features firms actually use daily. Karbon is built for mid-size firms (10+) with workflow automation, email-driven task creation, and team collaboration features that require admin overhead to configure.
Not exactly — FirmFlow focuses on client portal messaging instead of email triage. Most small firms find client portal messaging eliminates the email chaos that Karbon's triage was designed to solve. Clients message you in the portal, you respond there, done.
Yes. FirmFlow includes a task manager with priority levels (Low/Medium/High), assignees, due dates, and engagement linking. It is simpler than Karbon's workflow engine, but covers the 80% use case for small firms.
FirmFlow works alongside Xero and QuickBooks without replacing them. You can use FirmFlow for client-facing operations (portal, signatures, invoicing) while keeping Xero or QuickBooks Online for full accounting ledgers. Many of our bookkeeper customers run this exact setup.
If your firm relies heavily on email-based workflows with Karbon's Triage inbox, or needs advanced multi-step workflow automation with dependencies. Also stronger for deep QuickBooks and Xero integrations.
Documents, e-signatures, invoicing, and a client portal — all for €29/month flat.
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