AssemblyAI
Built by AI experts, AssemblyAI's Speech AI models include accurate speech-to-text for voice data (such as calls, virtual meetings, and podcasts), speaker detection, sentiment analysis, chapter detection, PII redaction, and more. AssemblyAI provides powerful APIs for transcribing and understanding audio data at scale. The platform supports real-time streaming transcription via WebSocket, asynchronous batch transcription, and audio intelligence features including summarization, auto chapters, entity detection, and content safety filtering. SDKs are available for Python, Node.js, Ruby, Java, and Go.
APIs
AssemblyAI API
The AssemblyAI API provides speech-to-text transcription, speaker diarization, sentiment analysis, chapter detection, PII redaction, and other audio intelligence capabilities vi...
Features
High-accuracy transcription of audio files and streams using AssemblyAI's Universal-2 model with support for 99+ languages and custom vocabulary.
WebSocket-based streaming transcription for live audio with partial results and final transcripts, supporting call centers, live captioning, and voice applications.
Automatic speaker detection and labeling that identifies who said what in multi-speaker recordings.
Advanced understanding features including sentiment analysis, summarization, auto chapters, entity detection, content safety filtering, and PII redaction.
LeMUR (Leveraging Large Language Models for Understanding Recordings) enables asking questions of audio transcripts using a conversational AI interface built on top of transcriptions.
Use Cases
Customer service teams transcribe and analyze customer calls for quality assurance, compliance, agent coaching, and sentiment analysis.
Enterprises transcribe virtual meetings (Zoom, Teams, Meet) to generate summaries, action items, and searchable archives.
Podcast producers transcribe episodes for SEO, accessibility, show notes, and content repurposing.
Developers build voice-powered applications using real-time streaming transcription for voice commands, dictation, and conversation interfaces.
Legal and compliance teams transcribe depositions, hearings, and recorded communications with PII redaction and timestamped transcripts.
Integrations
Integration with Twilio Media Streams for transcribing phone calls in real-time using AssemblyAI's streaming API.
Integration with Zoom recordings for batch transcription and meeting intelligence processing.
Official Python SDK for AssemblyAI available on PyPI (assemblyai) for easy integration in Python applications.
Official Node.js SDK for AssemblyAI available on npm (@assemblyai/sdk) for JavaScript and TypeScript applications.