Compare
Karbon is practice management for accounting firms built around email triage, workflow and team collaboration. Here's how it compares with OneFirmOS.
Side by side
| Karbon | OneFirmOS | |
|---|---|---|
| Focus | Workflow, email and collaboration for accounting firms | All-in-one practice management, including bookkeeping |
| Shared email | Email triage and collaboration | Outlook and Gmail intake, assign to colleagues, filing rules, follow-ups, reply templates and AI summaries |
| Data hosting | Region not stated on Karbon's security page | Canada (AWS Montreal); US clients' documents in the US |
| E-signatures | Sold as credit bundles (engagement letters excluded) | Included in the Documents add-on, no per-envelope fees |
| Bookkeeping ledger | No ledger of its own | Built in: cash coding, ledger, HST report, trial balance |
| Pricing currency | Can be paid in CAD | CAD, from $55 per user per month |
| QuickBooks Online | Integrates with general-ledger apps | Invoices, payments, credit notes, retainers and WIP sync into the firm's QuickBooks Online |
Karbon information is from karbonhq.com karbonhq.com, checked on 7 November 2026. Products change; tell us at support@onefirmos.com if anything is out of date.
Overlap
Both Karbon and OneFirmOS offer: Shared email triage and collaboration, workflow, time and budgets, billing and payments, proposals and engagement letters, and a client portal.
OneFirmOS adds its own bookkeeping ledger and cash coding, e-signatures with a tamper-evident audit trail and no per-envelope fees, multi-office and multi-currency billing, and HR and desk booking, all hosted in Canada.
FAQ
For firms that want one system covering workflow, time, billing, the client portal, documents, e-signatures and bookkeeping, hosted in Canada, yes.
OneFirmOS includes its own bookkeeping ledger and cash coding, QuickBooks Online sync, e-signatures with a tamper-evident audit trail and no per-envelope fees, multi-office and multi-currency billing, and is hosted in Canada.
Yes. Onboarding is assisted: we import your clients, contacts and documents, rebuild your workflows and train your team.
One platform
A 30-minute walkthrough on your firm's real workflow. First month free.