Tool profile
Karbon: cost, fit and limits
Karbon is a practice management platform for accounting firms that organizes recurring client work, emails, templates and team workload, with automatic client reminders on higher tiers. Its pages name no legal entity or headquarters. It is built for accounting firms.
What to know first
Karbon charges per user: Team at $59 a month paid annually, Business at $89 paid annually, and a custom Enterprise tier. Team on monthly billing is $79 a month for teams of four or more. There is no free trial and the route in is a booked demo. The pages describe client reminders but no portal as such. Business is where reminders appear.
Karbon at a glance
| Maker | Karbon (legal entity not stated), Not stated by the vendor |
|---|---|
| Free plan | No |
| Entry price | $59 per user per month paid annually (Team) |
| API access | No |
| Category | Best AI Client Portal Software in 2026, rank 11 of 11 |
| Website | karbonhq.com |
Who Karbon is best for
Accounting firms with recurring work
Work templates and workflow statuses let a firm repeat monthly and year-end cycles with each client's job in the same place.
Practices that chase clients by email
Business adds automatic client reminders and task automation, cutting manual follow-up on missing items. Clients receive prompts without anyone sending them by hand, which suits practices with many repeating deadlines.
Firms needing a SOC 2 report
The security page states SOC 2 Type 2 for the web application, which suits a partner reviewing vendors for client data.
Karbon plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Team | $59 per user per month, paid annually | 35 workflow statuses, 40 work templates, 30 work types, three teams, 10 contact types and 1,000 contacts. |
| Business | $89 per user per month, paid annually | Team plus client reminders, task automation, industry integrations, 50 statuses, 75 templates, 10 teams and unlimited contacts. |
| Enterprise | Custom pricing | Business plus Enterprise Platform, a dedicated Karbon contact, customization and unlimited usage limits. Pricing is not published on the page. |
Checked November 2026.
What Karbon does
- Work templates and statuses
- Team allows 35 workflow statuses and 40 templates, Business 50 and 75, and Enterprise unlimited, so complex practices outgrow the entry tier. A practice with many job types outgrows Team early, so count your recurring jobs before choosing.
- Automatic client reminders
- Business sends reminders to clients automatically, the closest thing the pricing page describes to client-facing automation. For practices where clients submit documents late, that automation is the reason to pay for Business.
- Contacts and client groups
- Team caps contacts at 1,000 and Business removes the cap, adding client groups for related entities. Related entities, such as a family and its companies, can be handled as one group on the higher tiers.
- Kai AI Coworker
- Navigation names Kai AI Coworker and AI Agents, marked new, but the pricing page does not tie either to a plan. Treat any claim about what Kai does as unconfirmed until the vendor ties it to a tier and a data policy.
- Industry integrations
- Business lists industry integrations without naming them, so verify your accounting stack before buying. The integrations are described only generally, so check that your accounting and tax software is on the list.
How Karbon handles your data
The security page says Karbon is SOC 2 Type 2 certified for the web application and not ISO 27001 certified, and that GDPR compliance rests on self-assessment with no third-party certification. It does not state a hosting region, saying only that cloud computing products and services are used. No retention period is given, though Karbon deletes a customer's data on request and takes regular backups. AI training is not addressed, and the Karbon AI Terms of Use were not opened.
Where Karbon falls short in practice
- No portal described. The pricing page mentions client reminders but no client login, file exchange or branded portal, so fit is weaker. A firm whose clients expect to log in and upload files will need a separate tool alongside Karbon.
- Demo only. There is no free trial, and the only call to action on plans is Book a Demo, which slows hands-on testing. Buyers who want to experiment first must schedule a session and may wait for a time slot.
- Caps by tier. Team caps contacts, teams and templates, and unlimited usage appears only on Enterprise, a tier with no published price. Large practices may therefore have to negotiate before they know the cost of staying on the platform.
Works with
Alternatives to Karbon
Karbon: common questions
Does Karbon have a client portal?
The pricing and security pages we opened describe automatic client reminders on Business but no branded client portal or file exchange. If clients need to log in to upload and sign, check with Karbon what its client-facing features cover before choosing it for that job.
Is Karbon SOC 2 certified?
The security page states SOC 2 Type 2 certification for the web application and says Karbon is not ISO 27001 certified. GDPR compliance is by self-assessment with no third-party certification claimed. Ask for the report under NDA if your clients require it.
What does Karbon cost for a four-person team?
Team is $59 per user per month paid annually, so four users cost $236 a month. Monthly billing costs $79 per user for teams of four or more, or $316. The page does not say which currency applies, so confirm it before budgeting.
What is Kai AI Coworker?
Karbon's navigation lists Kai AI Coworker, marked new, and AI Agents, but the pricing page does not tie either to a plan. The Karbon AI Terms of Use are linked from the footer. Ask which tier includes Kai and what data it can read.
Does Karbon offer a free trial?
No. The pricing page shows no trial, only a Book a Demo button for each plan. Budget time for a guided session, and ask whether a short sandbox is possible before you commit to annual billing. Ask for sandbox access.