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Audio & VoiceFreemiumVerified

AssemblyAI

Speech-to-text API with industry-best transcription accuracy.

Visit AssemblyAI@assemblyai

About AssemblyAI

AssemblyAI provides speech recognition, speaker diarization, sentiment analysis, and topic detection via API. The Universal-2 model leads transcription benchmarks. LeMUR adds LLM-powered understanding (summarization, Q&A) on top of audio. Used by Spotify, Sony, CallRail.

Key features

  • Universal-2 transcription (sub-7% WER)
  • Speaker diarization with auto-labeling
  • LeMUR for LLM-on-audio (Q&A, summaries)
  • Real-time streaming API
  • PII redaction and content moderation

Pros & limitations

Pros

  • Highest accuracy among STT APIs
  • Excellent developer documentation
  • Generous free credit for testing

Limitations

  • API-only — no end-user app
  • Pricing adds up at scale
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