Passmarked is a South African startup that has developed an open-source website testing tool to identify errors and issues in web code and suggest corrections. It tests websites across four key risk areas: security, performance, compatibility across devices, and content. The tool addresses the major problem that most of the billion existing websites were built by novices with limited coding knowledge and contain errors. Passmarked aims to harness the global coding community to fix issues and establish universal web standards to make the internet safer, more accessible and business-friendly.