AssemblyAI

Production-ready speech-to-text and audio intelligence API

4.3

Data & AnalyticsPay Per Use

Editorial Review

AssemblyAI is one of the strongest speech-to-text APIs available. The $50 free credit provides a generous starting point, and the pay-as-you-go model makes it accessible. The LeMUR framework for running LLM prompts against transcripts is innovative. Audio intelligence features set it apart from simpler transcription services. Costs compound when stacking multiple features, and real-time streaming is limited to six languages.

Pros

Excellent transcription accuracy

Generous $50 free credit

Comprehensive audio intelligence

Pay-as-you-go pricing

LeMUR framework

Strong developer experience

Key Features

Universal speech-to-textReal-time streaming transcriptionSpeaker diarizationSentiment analysisPII redactionAuto-language detection 40+ languagesLeMUR framework for LLM on transcriptsCustom vocabulary

About AssemblyAI

AssemblyAI provides high-accuracy speech-to-text transcription APIs with speaker diarization, sentiment analysis, entity detection, and summarization across 40+ languages.

Pricing

ModelPay Per Use

Starts at$0.15/mo

Free tier

Best For

Small (2-10)

Medium (11-50)

Mid-Market (51-200)

Enterprise (200+)

Integrations

AWSCloudflareTwilioZapierMake

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