AssemblyAI
Speech-to-text and voice AI APIs for product builders.
What is AssemblyAI?
AssemblyAI is a voice AI platform that offers speech-to-text and voice agent APIs for developers. It covers pre-recorded, real-time, and synchronous transcription workflows.
For recorded media, the pre-recorded API produces customizable transcripts in 99 languages. Teams can use it when they need transcripts from uploaded audio or video rather than a live stream.
The real-time API streams transcripts as audio arrives, supporting responsive voice applications. A separate synchronous API returns a completed transcript for a short clip in the same response.
AssemblyAI also provides speech understanding features for extracting speaker IDs, sentiment, chapters, and summaries. Its guardrails can redact PII and moderate content within audio and transcript workflows.
AssemblyAI Features
Pre-recorded transcription
The pre-recorded Speech-to-Text API creates customizable transcripts for recorded content. It supports 99 languages and is designed for applications that process uploaded audio or video.
Real-time transcription
The real-time Speech-to-Text API streams transcripts while audio is in progress. It is intended for agents and applications that need text output during a live conversation or event.
Speech understanding
The Speech Understanding API adds structured analysis to a transcription workflow. One API call can extract speaker identity, sentiment, chapters, and summaries from speech content.
Audio and transcript guardrails
AssemblyAI’s guardrails can redact PII and moderate content during audio and transcript processing. This helps teams apply content and sensitive-data controls before information reaches logs or an LLM.
Pricing
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