AssemblyAI
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Speech-to-text and speech understanding API for developers building voice products.
Offers Universal speech-to-text models for both batch (pre-recorded) and realtime streaming, plus a Speech Understanding API that extracts structured insights from transcripts. Guardrails handle PII redaction, profanity filtering, and content moderation, while an LLM Gateway and a Voice Agent API over a single WebSocket extend transcripts into agent workflows. Billed usage-based per audio hour or streaming session duration, with free starter credits.
Strengths
- Accurate batch and realtime streaming speech-to-text models
- Speech Understanding API for summaries, topics, and structured insights
- Built-in PII redaction, profanity filtering, and content moderation
- Usage-based pricing with free credits to start
Tradeoffs
- Proprietary models with no open-weight or self-hosted option
- Focused on transcription and understanding rather than text-to-speech