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§ Private Profile · San Francisco, CA, USA
AI platform automating end-to-end accounting workflows, client queries, and deliverables for tax, audit, and accounting teams in large firms.
Key people at Combinely.
Combinely was founded in 2024 by Tom Invernizzi (Founder) and Arthur Granacher (Founder).
Based in San Francisco, California, Combinely develops an artificial intelligence platform that automates end-to-end workflows for accounting and tax professionals. The software functions as an AI coworker that integrates directly with existing firm tools to handle repetitive daily tasks such as answering client queries, drafting responses, reviewing financial documents, and producing comprehensive tax summaries. Operating with a team of five employees, the enterprise currently targets mid-to-large accounting firms across the United States and the United Kingdom to improve their operational efficiency and compliance. The startup is currently backed by Y Combinator as part of its Spring 2025 batch under the guidance of partner Pete Koomen, while its leadership team brings prior experience from major technology and financial firms including Google, Shazam, and Deloitte. Combinely was founded in 2024 by Arthur Granacher and Tom Invernizzi.
Key people at Combinely.
Combinely is building an AI coworker specifically for accountants and tax teams, automating end-to-end workflows to drastically reduce time spent on repetitive, manual tasks. The product acts as an intelligent team member that reads client emails, drafts responses, generates deliverables like tax summaries and financial reviews, and reviews documents for inconsistencies—all while learning from a firm’s historical data, client context, and internal processes. It serves mid-to-large accounting and tax firms, particularly those looking to scale high-touch services without proportional headcount growth.
Combinely solves a critical pain point: accountants spend 30–40% of their time in email and inbox management, especially during high-pressure periods like tax season, leading to burnout, errors, and strained client relationships. By proactively handling communication and routine work, Combinely cuts manual workflow time in half and allows professionals to focus on judgment, strategy, and client relationships. The company has gained early traction with tech-forward accounting firms in the UK and US, is backed by Y Combinator, and is scaling rapidly through the LBS Incubator network, positioning itself as a foundational AI layer for the future of professional services.
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Combinely was founded by Tom Invernizzi, a former Deloitte accountant and London Business School graduate, and Arthur Granacher, an engineer with experience at Google and Shazam. The idea emerged from Tom’s firsthand frustration with the “drudgery of repetitive tasks” in accounting—endless email chains, chasing documents, and recreating context for every client interaction. He envisioned an AI that could act like a real coworker: understanding firm-specific workflows, learning from past work, and taking initiative without constant prompting.
The founding team combined deep domain expertise in accounting with strong engineering and AI capabilities, building Combinely from the ground up as a vertical AI solution for professional services. Early traction came from pilot deployments with mid-to-large accounting firms that were eager to differentiate their service offering through AI. Participation in the London Business School Incubator and subsequent acceptance into Y Combinator validated the vision and accelerated growth, leading to a public launch centered around a 60-second demo that clearly articulated the product’s value: an AI coworker that cuts Outlook time in half.
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Vertical AI built for accountants, not generalists- Trained specifically on accounting and tax workflows, language, and compliance requirements.- Understands firm-specific templates, client nuances, and historical responses, unlike generic assistants like ChatGPT.
Proactive, not reactive, intelligence- Acts autonomously as soon as an email arrives, drafting replies, locating documents, and flagging items for review.- Reduces context-switching by handling communication and deliverables before the accountant even opens their inbox.
Deep contextual learning at three levels- Builds live, dynamic profiles for each client, firm, and topic, continuously learning how the team works and tailoring outputs accordingly.- Leverages private firm data securely to generate accurate, consistent, and brand-aligned responses.
End-to-end workflow automation- Goes beyond email drafting to generate first drafts of tax summaries, financial reviews, and other deliverables.- Assists in document review by extracting key figures and flagging anomalies for human verification.
Designed to amplify, not replace- Positioned as an “AI coworker” that augments human expertise, freeing accountants to focus on advisory, judgment, and client relationships.- Aligns with the future of professional services: scaling high-touch, high-value work without linear headcount growth.
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Combinely is riding the convergence of three powerful trends: the maturation of vertical AI, the labor crisis in professional services, and the shift toward AI-native workflows in knowledge work. Accounting and tax firms face shrinking workforces, rising client expectations, and intense seasonal pressure—conditions that make automation not just attractive but necessary. At the same time, large language models have advanced to the point where they can understand complex, structured domains like tax and finance, especially when fine-tuned on proprietary data.
The timing is critical: firms are no longer asking *if* they should adopt AI, but *how quickly* they can deploy it to stay competitive. Combinely sits at the intersection of workflow automation and domain-specific AI, much like how Vercel redefined frontend development or Notion reshaped knowledge work. By focusing narrowly on accountants and tax teams, it avoids the pitfalls of generic AI tools and delivers measurable ROI in time savings and error reduction. In doing so, it’s helping to define what an AI-augmented professional services firm looks like—one where AI handles the routine, and humans focus on the strategic.
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Combinely is poised to become the default AI layer for accounting and tax firms in the next 3–5 years. Its immediate path is clear: expand into more complex accounting and tax workflows, onboard larger regional and national firms in the UK and US, and deepen integrations with core practice management and tax software. Over time, the “AI coworker” concept could extend beyond accounting into adjacent professional services like investment banking, consulting, and legal—domains that share similar patterns of document-heavy, communication-intensive work.
The bigger opportunity lies in reshaping the business model of professional services. As Combinely enables firms to deliver more with less, it could unlock new pricing models (e.g., outcome-based or subscription services), improve margins, and reduce burnout-driven turnover. For investors and ecosystem players, Combinely represents a rare combination: a technically strong, domain-focused AI company with a clear path to enterprise adoption and a large, defensible market in the $180B+ US accounting labor market. The future of tax and accounting isn’t just faster—it’s fundamentally different, and Combinely is building the coworker that makes it possible.
Combinely was founded in 2024 by Tom Invernizzi (Founder) and Arthur Granacher (Founder).
