Production-ready speech-to-text API
AssemblyAI is the developer's choice for speech-to-text. The LeMUR feature that combines LLMs with audio data is genuinely innovative and opens up powerful use cases.
Alternatives to consider: Otter.ai, Whisper, Speechify
Last verified: April 2026
AssemblyAI provides a suite of speech AI APIs including speech-to-text, speaker diarization, sentiment analysis, topic detection, and LeMUR for applying LLMs to audio data. Known for high accuracy and developer-friendly documentation, used by companies like Spotify, BBC, and CallRail.
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AI text-to-speech for reading accessibility