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AssemblyAI vs Vapi

Side-by-side comparison of AssemblyAI and Vapi: pricing, features, API access, and community ratings.

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AssemblyAI
AssemblyAI

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

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Vapi
Vapi

Voice agents for builders

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Category
Voice & speech
Voice & speech
Pricing
Freemium
Freemium
Starting price
Free tier
Audience
Technical
All audiences
API available
Open source
Self-hostable
Model provider
AssemblyAI (Universal-3 Pro, Universal-2, Universal-Streaming, Whisper-Streaming)
OpenAI (intelligence), Deepgram (transcriber), ElevenLabs (voice)
Founded
2017
2023
Headquarters
San Francisco, United States
Key strengths
  • ·Industry-leading transcription accuracy across 99 languages
  • ·Real-time and pre-recorded speech-to-text with async-level accuracy
  • ·Full Voice AI platform: transcription, understanding, agents, and guardrails in one place
  • ·No concurrency limits or throttles — scales from MVP to 400,000+ hours/month
  • ·Sub-500ms average latency
  • ·Enterprise-grade scalability (billions of calls)
  • ·SOC 2, HIPAA, and PCI compliance
  • ·API-native design
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