SAPI

The Speech Application Programming Interface (SAPI) is a Microsoft Windows API that enables applications to use speech recognition and text-to-speech synthesis. SAPI provides a standardized interface between speech engines and applications, meaning that a synthetic voice built to be SAPI-compliant can work with any SAPI-enabled application, including AAC communication software, screen readers, and other assistive technologies. This interoperability is important for accessibility because it allows users to use personalized or preferred voices across multiple applications without being locked into a single vendor's ecosystem.