Rational

Rational is an AI accounting service that describes itself as the zero human accounting firm: AI agents take on recurring bookkeeping and back office finance work, with human judgment reserved for the exceptions. Rather than a dashboard for accountants to operate, it positions its agents as AI employees for an accounting team, each owning a defined workflow end to end. It is aimed at finance and accounting teams that lose time to follow up and repetitive processing. The published agents cover four workflows. An accounts payable agent handles invoice intake, gathers supporting documentation and applies routing rules so exceptions surface before approval. A document follow up agent chases missing receipts, statements and approvals without relying on a staff inbox. A bank reconciliation agent matches transactions automatically while keeping source evidence and reviewer decisions for anything unresolved. A month end close agent tracks task dependencies, pursues missing documentation and routes items that need judgment to the right person. Governance is built around source evidence, scoped system access, approval gates and a decision history, and the vendor's rule is that automation stops where judgment starts. The company reports SOC attestation for service organizations and integrates with existing accounting systems. Pricing is not published. Engagements begin with a demo booked with the founders, and scope is agreed per client. Rational is a Y Combinator backed company based in San Francisco. Its public site is deliberately thin, so the agent pages and the security page are the places to read before a call.