Karbon
Cloud practice management software that unites work, clients, email and billing for accounting firms
By Karbon · HQ San Francisco, US · 4.7/5 verified-buyer score
Positioning guardrails
Best for
- Accounting, bookkeeping and tax firms that want email, workflow, tasks, clients and billing in one practice management platform.
- Firms standardising repetitive work with templates, task automation and automated client requests.
- Distributed or multi-office firms that need visibility into who is doing what and where each job stands.
- Firms already running Xero, QuickBooks Online, HubSpot, Slack or Microsoft 365 that want those tools wired into their workflow.
Ideal size: 5–500 employees people · Growing accounting firm with defined processes and appetite for workflow standardisation
Not for
- Non-accounting businesses; the product is purpose-built for accounting practices.
- Very small firms that only need a simple shared task list and do not want per-user pricing.
- Teams looking for a heavy ERP-style PSA with deep project accounting and no per-seat pricing.
- Firms unwilling to standardise processes, since most value comes from adopting shared workflows.
Value metrics scorecard
Time-to-Value
4–6 weeks with guided onboarding
~30 days to first production value
Total Cost of Ownership
$53,400/yr
Starts at $708 · Per user, per month; annual billing gives a lower rate than monthly (Team $59/user/month annually, Business $89/user/month annually).
Implementation Friction
3/5
Engineering + admin effort required
Buyer Score
out of 5 · verified buyers
Full cost breakdown
Mandatory implementation fee
None
Seat tiers
Per-user seats; monthly subscriptions are only available for teams of 4+. Every team member needing access needs a paid user seat.
Add-on costs
- Email Insights and Custom Reporting: paid add-ons on higher plans.
- Team training, advanced team training and quarterly expert Q&A sessions: paid add-ons.
- Dedicated Customer Success Manager: paid add-on.
- eSignature credits: $100 for 100 credits up to $2,000 for 4,000 credits; approvals included for one year.
- Payment processing fees: 2.6% + $0.30 standard cards; 3.9% + $0.30 Amex; ACH 1% + $0.30 (max $5.00).
Company & support
Who is behind Karbon, and how your team gets help once it is live.
Company
- Founded
- Not recorded
- Headquarters
- San Francisco, US
How you get support
- PhoneAll plans
- EmailAll plans
- Live chatNot listed
- Support portal / ticketsAll plans
- Community forumAll plans
- Help centre / docsAll plans
- Dedicated account managerEnterprise only
- In person / on-siteNot listed
- Hours
- 24/7
- Response time
- Not stated
Contact page lists 24/7 phone support for the US, AU and UK plus in-app help and feedback; pricing lists 24/7 support under all plans. Knowledge base, The Loft community and live onboarding workshops are also offered. Dedicated Karbon contact is an Enterprise item.
“Not listed” means the vendor’s public pages don’t mention that channel, not that it is unavailable. Ask about it during evaluation.
Market position
Where Karbon sits relative to every other solution in the database. Toggle axes to compare on cost, speed, friction, or buyer score.
Quadrant view
Implementation friction × Verified buyer score
Stack fit signal
Compatibility with standard B2B ecosystems.
No supported MCP path today, so it cannot be driven from an AI client.
AI & MCP readiness
What Karbon ships in AI, and what it asks of your ecosystem.
AI features shipped
Karbon's homepage introduces Kai, described as an AI coworker that knows your clients, work and team, answers questions from firm data, summarises clients, and can be asked to take on a task. No model provider, data-handling or AI audit detail is stated on the pages reviewed.
In your ecosystem
- AI connection
- Not supported
- Model key
- Not recorded
- AI usage audit
- Not recorded
Industry verdicts
How Karbon speaks to each vertical it serves — same data, sector lens.
Professional ServicesBill hours faster, staff smarter.
Best for in Professional Services
- Accounting, bookkeeping and tax practices running recurring compliance and advisory work.
- Firms managing high volumes of client email, document requests and eSignatures.
- Practices with multiple offices or teams that need one shared view of all jobs.
- Advisory-heavy firms that bill for time and want time, budgeting and billing tied to work.
Not for
- Generalist consultancies and law firms with no accounting workflow.
- Solo operators with no team collaboration needs.
- Firms that will not move email and processes into a single shared system.
Karbon is purpose-built for accounting firms rather than general professional services. It covers email triage, workflow and tasks, client management, client portal, documents, time and budgets, billing, payments and engagements, with a public API and an accounting-app ecosystem. The vendor reports 40,000+ accounting professionals in 34 countries and 5.5M jobs completed in 2024, and claims average savings of 19.9 hours per employee per week. Adjacent advisory, outsourced bookkeeping and firm-services teams can fit if they adopt the accounting-style workflow.
Compliance attestations
* IAPP AIGP certifies individuals, not products. It means named staff hold the credential — not that the platform does.
Bottom line
Karbon is cloud practice management software purpose-built for accounting, bookkeeping and tax firms. It combines email triage, workflow and tasks, client management, a client portal, document storage, time and budgets, billing and payments in one platform, with a public API and many app integrations. The vendor cites 40,000+ accounting professionals in 34 countries, 5.5M jobs completed in 2024, SOC 2 Type II compliance and per-user pricing from $59 per user per month billed annually.
Frequently asked questions
How much does Karbon cost?
Karbon is priced per user. The Team plan is $59 per user per month billed annually ($79 monthly) and the Business plan is $89 per user per month billed annually ($99 monthly); monthly subscriptions require at least four users. Enterprise is custom priced. Add-ons include eSignature credits, extra training, Email Insights, custom reporting and payment processing fees.
How long does it take to get live on Karbon?
Karbon does not publish a fixed timeline. It offers implementation services ranging from group onboarding to guided implementation packages led by a dedicated expert, and live training workshops for onboarding. A typical mid-market accounting firm should budget several weeks for configuration, data import and workflow rollout.
Is Karbon secure and compliant?
Karbon states that its web application is SOC 2 Type II certified following annual audits, uses TLS in transit and AES-256 encryption at rest, and says it has completed a self-assessment for GDPR compliance. An ISMS aligned to ISO 27001 has been implemented but the vendor states it is not yet independently certified. HIPAA and FedRAMP are not claimed.
What AI does Karbon offer?
Karbon's site introduces Kai, an AI coworker that is described as knowing a firm's clients, work and team, answering questions from firm data in seconds, summarising clients, and taking on tasks when asked. No model provider or AI audit logging details are published on the pages reviewed.
Will Karbon connect to the tools we already use?
Yes. Karbon exposes a documented public API and webhooks, and lists integrations for HubSpot, Slack, Microsoft 365 and Google Drive, plus accounting and tax tools such as Xero, QuickBooks Online Accountant, XPM, Ignition and numerous tax and workflow apps.
What support is included?
Karbon publishes 24/7 phone support numbers for the US, Australia and the UK, in-app help and feedback, email support, a help centre and The Loft customer community. A dedicated customer success manager is an add-on, and Enterprise plans include a dedicated Karbon contact.