Curvestone AI

Curvestone AI is a London-based workflow automation platform built for the financial services, legal, and insurance sectors. The company tackles what it calls the "compound error problem": individual AI steps may run at 98% accuracy, but chained across a dozen operations, end-to-end accuracy can collapse to 30–40%. Curvestone's platform is engineered to hold accuracy steady across the full workflow, making it usable for document-heavy, regulated processes where approximation is not an option.

The product is model-agnostic — it works with any large language model — and integrates with existing CRMs, document management systems and core line-of-business platforms rather than asking teams to adopt new tools. Customers use it for compliance reviews, contract analysis and multi-step validations, with human-in-the-loop review and audit-ready outputs. Curvestone is ISO 27001-certified.

The company was founded by Breanna Yen alongside brothers Dawid and Sebastian Kotur, who previously led AI automation programmes at PwC, Metro Bank and GKN. Curvestone reached profitability before taking outside funding, grew revenue 7× in the twelve months prior to its December 2025 seed round, and now processes billions of tokens quarterly. Customers include Stephenson Harwood, Browne Jacobson, Walker Morris and Pivotal Growth.