Karbon
Karbon is a vertical SaaS practice management platform for accounting firms, integrating workflow automation, project management, email, client collaboration, billing, and analytics with AI capabilities (Karbon AI, Kai AI Coworker, Aider) and 80+ native integrations, serving small to enterprise accounting practices worldwide.
- Company typePrivate
- Founded2014
- HeadquartersSausalito, United States
- Headcount251–500
- GTM typeB2B
- OfferingSoftware
What Karbon does
Karbon is a privately held vertical SaaS company that provides practice management software purpose-built for accounting firms. Founded in 2014 and headquartered in San Francisco, the company serves a range of accounting practices — from solo bookkeepers to large multi-office enterprises that include Baker Tilly, BDO, HLB, and Armanino — through a tiered subscription model organized around Small, Mid-sized, Large/Enterprise, Bookkeeping, Tax, and PE/M&A buyer segments. Its core platform unifies workflow automation, project management, email-to-task ("Karbon Triage"), team collaboration, client management, billing, time tracking, document management, and Karbon Analytics within a single cloud system, distributed through direct sales, mobile apps, a public API, and a Practice Marketplace for buying and selling firms.
The company's technology stack layers an AI capability suite on top of the workflow engine: Karbon AI applies generative AI and NLP to email summarization and client communication drafting; the Kai AI Coworker (launched in early access June 2026) is an autonomous AI agent that draws on firm data and 80+ native integrations (Xero, QuickBooks Online Accountant, Gusto, StanfordTax, Float, Zapier, Digits, Ignition, Reach Reporting, Aider) to assist with work execution; and period-close automation was added via the September 2025 acquisition of Aider. Tax organizers and binders (powered by StanfordTax, December 2025) and native payroll (via Gusto, April 2026) extend the surface into adjacent accounting workflows. The platform is sold via a sales-led motion with "Book a Demo" CTAs and quote-based annual subscriptions, supplemented by Group Onboarding, Premium support, customer referral fees, and marketplace transactions.
Karbon has raised approximately $102 million in cumulative funding across equity rounds led by Tidemark and Five Elms Capital ($66M in February 2022), a follow-on $10.5M round in September 2023, a $5M CIBC Innovation Banking credit facility in 2021, and earlier rounds from Blackbird Ventures and TIMIA Capital. The company reports 18.5 hours saved per employee per week across surveyed customers and has held G2 leadership in accounting practice management for 18 consecutive quarters with a 4.8/5 average rating.
Karbon firmographics
Firmographics- Name
- Karbon
- Legal name
- Karbon, Inc.
- Website
- https://karbonhq.com
- Company type
- Private
- Founded year
- 2014
- Operating status
- Operating
- Headcount range
- 251–500 employees
- Short description
- Karbon is a vertical SaaS practice management platform for accounting firms, integrating workflow automation, project management, email, client collaboration, billing, and analytics with AI capabilities (Karbon AI, Kai AI Coworker, Aider) and 80+ native integrations, serving small to enterprise accounting practices worldwide.
- Ownership category
- akta.pro rank
Karbon industry classification
Industry- Product category
- Accounting Practice Management Software
- NAICS
- Software Publishers (513210), Computer Systems Design and Related Services (54151), Custom Computer Programming Services (541511)
- SIC
- Services-Computer Programming Services (7371), Services-Prepackaged Software (7372), Services-Computer Integrated Systems Design (7373)
- akta.pro primary industry
- Compliance, GRC Workflow & Audit Automation Platforms (HDAEAHAL)
- akta.pro secondary industry
- GRC Platforms & Workflow Automation (HDADAIAA)
Keywords
Where Karbon is headquartered
LocationHeadquarters
- HQ city
- Sausalito
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Karbon business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Marketing or Sales, Operations, Infrastructure
Revenue model
- SaaS Subscriptions: Recurring subscription revenue from the Karbon practice management platform across tiered segments (Small Firms, Mid-sized Firms, Large Firms/Enterprise, Bookkeeping, Tax, PE/M&A). Pricing is quote-based / not publicly disclosed.
- Professional Services (Onboarding & Premium Support): Revenue from Group Onboarding, Enterprise services, and Karbon Premium Customer Service engagements.
- Marketplace Transaction Facilitation (Practice Marketplace): Platform facilitating buy/sell transactions and introductions between accounting firms and M&A advisors/implementers via the Practice Marketplace and Partners Marketplace.
- Customer Referral and Affiliate Programs: Referral-fee revenue via the Karbon Customer Referral Program and Karbon Affiliate Program (referral-factory).
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Annual | Quote-based subscription; tiered by firm size and segment (Small, Mid-sized, Enterprise, Bookkeeping, Tax, PE/M&A) |
Go-to-market motion5 records
Distribution channels6 records
Marketing channels12 records
Karbon product offering
Product offeringCore offering
Karbon provides a cloud-based practice management SaaS platform purpose-built for accounting firms, integrating email, tasks, projects, client records, workflow automation, billing, time tracking, document management, and team collaboration in a single workspace. The platform is augmented by Karbon AI and the Kai AI Coworker for generative and agentic assistance, supports 80+ native integrations, and includes the separately accessible Practice Marketplace for buying and selling accounting firms.
Product overview
Karbon offers a unified practice management platform for accounting firms, built as a core platform with an ecosystem of integrated modules and add-ons. The core Karbon Practice Management Platform provides project management, workflow automation, email management, team collaboration, close automation, engagements, client management, client portal, billing & payments, time tracking & budgets, document management, eSignatures & approvals, and Karbon Analytics. AI capabilities are layered on as Karbon AI and the early-access Kai AI Coworker (an autonomous AI agent that knows firm data), with further capabilities from the acquired Aider AI assistant. Specialized add-on modules include Tax Organizers & Binders (powered by StanfordTax) and native Payroll via Gusto integration. Beyond the core platform, Karbon also offers Practice Marketplace as a separate platform connecting accounting firms with apps and services, and mobile apps for iPhone and Android. The platform is supported by more than 80 native integrations enabling cross-platform workflows.
Differentiator
Problem solved
Functional benefit
Brands
- Practice Marketplace: An online marketplace operated by Karbon for buying and selling accounting firms, accessible at practicemarketplace.bykarbon.com.
- The Loft Community
- Kai
Products and services
- Karbon Practice Management Platform The central SaaS platform for accounting firms that unifies emails, discussions, tasks, projects, workflow automation, client management, billing, time tracking, document management, and team collaboration into a single workstream collaboration workspace.
- Karbon AI AI add-on layered on the Karbon platform that uses generative AI to summarize email conversations, draft client updates, surface insights, and automate routine practice management tasks for accounting firms.
- Kai AI Coworker Autonomous AI agent embedded in the Karbon platform that draws on firm data and 80+ native integrations to assist practitioners with routine tasks, client insights, meeting notes, analytics, email handling, billing, and workflow coordination. Currently in early access.
- Practice Marketplace Separate platform operated by Karbon that connects accounting firms with apps, services, M&A advisors, and certified implementers, and enables firms to list themselves for acquisition. Expanded in February 2025 to all accounting firms beyond Karbon customers.
- Karbon Mobile App Native mobile applications for iOS and Android that provide accounting practitioners on-the-go access to the Karbon practice management workspace, tasks, communications, and collaboration features.
- Aider AI-powered advisory and reporting technology acquired by Karbon in September 2025 that automates period close workflows and delivers real-time insights to support advisory services for accounting firms.
Quantifiable outcome
- Karbon saves each employee 18.5 hours per week; 18% growth in firm-wide productivity (Karbon 2024 Firm Usage Survey, 15% of customer base)
- +3 more outcomes
Companies that use Karbon
Customer profileNamed customers23 records
Segments6 records
Ideal customer profiles5 records
Karbon technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration12 records
AI capability8 records
Feature8 records
Karbon partnerships and signals
Strategic signalPartnerships
Eleven partnerships are on record, tiered core, flagship and major.
- DigitscoreDigits (AI-native accounting platform) announced partnerships with Karbon, Ignition, and Reach Reporting to integrate its ledger system with practice management, billing automation, and client reporting tools for accounting firms, helping firms compress compliance work and redirect capacity to advisory services.
- IgnitioncoreCo-announced with Digits and Karbon to integrate Digits' ledger with Ignition's billing automation, Karbon's practice management, and Reach Reporting's client reporting for accounting firms.
- Reach ReportingcoreCo-announced with Digits and Karbon to integrate Digits' continuously maintained financial ledger with Reach Reporting for client reporting at accounting firms.
- GustocoreKarbon and Gusto partnered to integrate payroll workflow management directly into Karbon's practice management platform. The integration (in beta in the U.S., GA planned for mid-2026) automatically creates payroll work items from Gusto pay schedules, syncs deadlines, and tracks approvals and client tasks in real time. Gusto serves over 500,000 small businesses.
- StanfordTaxflagshipKarbon launched Smart Tax Organizers and Binders powered by StanfordTax in the U.S., integrating three steps (organizers, intake, binders) into a single workflow. Distributed via the Karbon app marketplace to streamline tax preparation for U.S. tax firms.
- Karbon App Marketplace (Karbon HQ)flagshipKarbon app marketplace distributes third-party integrations such as StanfordTax-powered Tax Organizers & Binders. Karbon operates the marketplace as the OEM/distribution layer.
- AiderflagshipKarbon acquired Aider, an AI-powered advisory and reporting technology company. The acquisition integrates period close automation and real-time insights into Karbon's practice management platform, expanding advisory services for firms in the U.S., Canada, and other countries.
- XeroflagshipXero and Karbon partnered to combine Xero's cloud-based financial tools with Karbon's practice management platform. The integration is available in the US and all major Xero markets, addressing Client Advisory Services demand. Users report 18.5 hours/week saved per employee and 18% productivity growth (Karbon 2024 Firm Usage Survey).
- ZapiermajorZapier integration enables Karbon to connect to 5,000+ apps including cloud accounting tools, CRMs, and marketing solutions, expanding the platform's ecosystem reach.
- QuickBooks Online AccountantflagshipFeatured Karbon integration with QuickBooks Online Accountant to unlock powerful service delivery and billing workflows for accounting firms.
- Google (Workspace API)majorKarbon uses Google API services within the Karbon platform; Google API Disclosure and use terms are published at karbonhq.com/use-of-google-api-services.
Scale indicators7 records
Recent moves7 records
Expansion highlights6 records
Karbon competitors and assessment
Company assessmentDirect peers
- Canopy: Canopy is a practice management platform purpose-built for accounting firms, offering client management, document workflows, billing, and a client portal — directly competing with Karbon in the same vertical and customer base.
- TaxDome: TaxDome is an all-in-one practice management platform for accounting and tax firms, bundling CRM, workflows, client portal, billing, and document management — competing head-to-head with Karbon across SMB and mid-market accounting firms.
- Financial Cents: Financial Cents is a workflow and practice management solution built specifically for accounting firms, focused on recurring work, client requests, and team capacity — a direct vertical competitor to Karbon's workflow automation core.
- Jetpack Workflow: Jetpack Workflow provides recurring workflow and process management for accounting firms, competing directly with Karbon's workflow automation and templating capabilities in the small and mid-market segment.
- Practice Ignition: Practice Ignition (Ignition) automates proposals, engagement letters, and billing for accounting firms; Karbon recently partnered with Ignition alongside Digits and Reach Reporting, indicating strong overlap in the same buyer.
- Xero Practice Manager: Xero Practice Manager (and the broader Xero for Accountants suite) offers native practice management to Xero's accounting firm customers — a vertically integrated competitor with deep ecosystem overlap via Karbon's Xero partnership.
Broad incumbents
- Intuit QuickBooks Online Accountant: Intuit's QuickBooks Online Accountant and ProConnect suite bundle practice management, client collaboration, and accounting software for U.S. accounting firms — a broad incumbent leveraging Intuit's installed base against Karbon.
- Wolters Kluwer CCH Axcess: Wolters Kluwer's CCH Axcess platform serves large accounting firms with workflow, document, and tax workflow tools — a broad incumbent competing with Karbon's enterprise tier in larger firms.
- Thomson Reuters Onvio: Thomson Reuters' Onvio is a cloud practice management and accounting suite for small and mid-sized firms — a broad incumbent with overlapping workflow, document, and collaboration features to Karbon.
Emerging players
- Digits: Digits is an AI-native accounting platform that recently partnered with Karbon, Ignition, and Reach Reporting — representing an emerging player whose AI-led general ledger approach could compete with Karbon's Aider-driven advisory stack.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks7 records
Key highlights7 records
Customer concentration
Karbon social profiles
Digital presenceKarbon compliance and trust
Trust signalCompliance1 record
Karbon financial estimates
Financial estimateRevenue estimate
Valuation estimate
Karbon leadership team
Management profileNumber of profiles
Profiles12 records
Karbon subsidiaries and ownership
Company hierarchySubsidiaries1 record
Karbon funding detail
Funding detailFunding overview
Funding rounds9 records
Investors5 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Karbon M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Karbon
What does Karbon do?
Karbon provides a cloud-based practice management SaaS platform purpose-built for accounting firms, integrating email, tasks, projects, client records, workflow automation, billing, time tracking, document management, and team collaboration in a single workspace. The platform is augmented by Karbon AI and the Kai AI Coworker for generative and agentic assistance, supports 80+ native integrations, and includes the separately accessible Practice Marketplace for buying and selling accounting firms.
Is Karbon a public or private company?
Karbon is a private company. It is classified as venture growth investor backed and is currently operating.
When was Karbon founded?
Karbon was founded in 2014. It employs 251 to 500 people.
Where is Karbon based?
Karbon is headquartered in Sausalito, United States, in the North America region.
How does Karbon make money?
Four revenue lines are on record. SaaS Subscriptions are the primary driver. The others are professional Services (Onboarding & Premium Support), marketplace Transaction Facilitation (Practice Marketplace) and customer Referral and Affiliate Programs.
Who are Karbon's main competitors?
Direct peers on record are Canopy, TaxDome, Financial Cents, Jetpack Workflow, Practice Ignition and Xero Practice Manager. Broad incumbents are Intuit QuickBooks Online Accountant, Wolters Kluwer CCH Axcess and Thomson Reuters Onvio. Digits is listed as an emerging player.
Does Karbon have an API?
Yes. Karbon offers a public API for developers. The API Developer Center (https://developers.karbonhq.com/) provides documentation at https://karbonhq.github.io/karbon-api-reference/. Developers can use the API to integrate and automate workflows with the Karbon practice management platform. The privacy policy also references Karbon's use of Google API services for its operations. Developer documentation is at karbonhq.github.io/karbon-api-reference.
What industry is Karbon in?
Karbon's product category is Accounting Practice Management Software. Its primary akta.pro industry code is HDAEAHAL, Compliance, GRC Workflow & Audit Automation Platforms, with a secondary code of HDADAIAA, GRC Platforms & Workflow Automation. Its NAICS code is 513210 and its SIC code is 7371.