AssemblyAI

Free tier

Voice AI infrastructure for builders — industry-leading speech-to-text and voice agent APIs

Free tier available·Technical·Powered by AssemblyAI (Universal-3 Pro, Universal-2, Universal-Streaming, Whisper-Streaming)·API available

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Key strengths

Industry-leading transcription accuracy across 99 languagesReal-time and pre-recorded speech-to-text with async-level accuracyFull Voice AI platform: transcription, understanding, agents, and guardrails in one placeNo concurrency limits or throttles — scales from MVP to 400,000+ hours/monthBuilt-in PII redaction, content moderation, and LLM gateway

Free tier + paid plans

San Francisco, United States

Founded 2017

Self-hostable

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