Full-stack AI accounting platform for CPA firms
HQ: San Francisco, CA | Founded: 2025 | Employees: 4 | Stage: Seed | Website: https://cranston.ai
Cranston AI is a full-stack AI accounting platform that automates back-office accounting work for CPA firms. The platform handles data ingestion from multiple sources, transaction processing and categorization, bank reconciliation, financial insights and analytics, and tax preparation. It sits on top of existing accounting tools like QuickBooks and CCH Axcess, pushing completed work for reviewer approval. Cranston targets the $900B market for accounting labor. Founded in 2025 by Sean O'Bannon (CEO) and Max Minsker. O'Bannon studied CS and AI at Stanford before dropping out to start ReMatter, a vertical ERP for scrap yards that raised $20M+ from Founders Fund and Index Ventures. He managed a team of 20+ and previously worked at Databricks. Minsker ran a bootstrapped accounting firm that served thousands of clients and filed 10,000+ tax returns. He also served as COO at multiple YC companies and is a former debate champion. YC Fall 2025 batch. Raised $500K+ from Y Combinator, Rebel Fund, Agent Fund, Palm Drive Capital, and Transpose Platform. HQ in San Francisco, CA with presence in Austin, TX.
Cranston AI has an unusually strong founding team for an early-stage startup: Sean built ReMatter (raised $20M+ from Founders Fund and Index Ventures) and was at Databricks, Max ran a real accounting firm filing 10k+ returns and was COO at YC companies. This combination of AI engineering talent + deep accounting domain expertise is rare. The 'full-stack AI accounting' pitch is compelling — they sit on top of existing tools (QuickBooks, CCH) and automate the manual work. Key risk: the accounting AI space is extremely crowded, but the team quality suggests they could execute well.
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