Denki is a full-stack AI financial audit firm that automates internal audit functions including planning, testing, and documentation to help organizations comply with financial regulations. The platform operates on top of existing systems such as AuditBoard and Workiva, automating control processes while preserving audit traceability through detailed workpapers. It targets the labor-intensive workflows of internal audit and SOX compliance teams. Denki was founded in 2025 and is part of Y Combinator's Fall 2025 batch.