Assembly AI

Founded by Dylan Fox in 2017

Transcribe speech to text and extract insights from audio via API

Cost

Pay as you go

Rating

★ People love it

Time to value

Quick Setup (< 1 hour)

You can use AssemblyAI to convert spoken audio into text using pre-recorded, real-time, or synchronous speech-to-text APIs. It supports 99 languages and lets you extract speaker identification, sentiment, summaries, and chapters from audio. You can also build voice agents with turn detection and interruption handling, redact PII from audio, and route between multiple LLMs from a single endpoint. It processes over 2 million hours of audio daily and scales from small projects to enterprise workloads.

What Assembly AI does

Transcribe audio files to text via REST APIStream real-time transcriptions from a microphone inputExtract speaker labels, sentiment, and summaries from audioRedact PII from audio transcripts automaticallyBuild and deploy voice agents with turn detectionSwitch between LLM providers from a single API endpointMonitor transcription accuracy and model performanceScale audio processing from hundreds to hundreds of thousands of hours monthlyReal-time speech-to-text with async-level accuracy via streaming APIPre-recorded transcription in 99 languages with natural language promptingSync Speech-to-Text API that returns results in a single HTTP response without pollingVoice Agent API with built-in turn detection and interruption handlingSpeaker identification, sentiment analysis, chapter detection, and summaries from one API callInline PII redaction on audio and transcripts before data reaches logs or LLMsLLM Gateway to route between GPT, Claude, Gemini, and community models with automatic fallbackNo concurrency limits or throttling at any usage scale