AssemblyAI

A developer API platform for speech-to-text, real-time transcription, voice agents, and speech understanding used to build voice AI products.

assemblyai.com

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About

AssemblyAI provides production-grade APIs for building voice-powered applications, including pre-recorded speech-to-text, real-time speech-to-text for live captions and agents, a Voice Agent API for speech-to-speech conversations over a single WebSocket, Speech Understanding for structured insights, Guardrails for PII redaction and content moderation, and an LLM Gateway for applying frontier language models to voice workflows. The platform is designed for developers and teams that need accurate, scalable speech AI infrastructure. AssemblyAI is a product of AssemblyAI.

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Product details

Product kind
Api
Pricing model
Usage Based
Open source
No
api
Audio and video transcriptionLive captionsVoice agentsAgent assistPII redactionSpeech understanding and analytics