AssemblyAI
Speech AI API platform for developers that transcribes audio, understands spoken content, and enables voice agent applications.
About
AssemblyAI provides a set of developer APIs built around speech recognition and audio understanding. Its transcription endpoints handle both pre-recorded files and live audio streams with high accuracy, while additional models extract summaries, sentiment, topics, and structured data from the resulting text. A Voice Agent API lets teams build real-time speech-to-speech applications over WebSocket connections, and safety features such as PII redaction and content moderation are available out of the box. The platform is aimed at engineering teams that need reliable, scalable speech infrastructure. Pricing is usage-based with a free tier for development and testing.