AssemblyAI vs Rev AI

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

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	AssemblyAI Voice AI infrastructure for builders — industry-leading speech-to-text and voice agent APIs Visit	Rev AI The world's most accurate speech-to-text API for developers, built for speed and global scale. Visit
Category	Voice & speech	Voice & speech
Pricing	Freemium	Freemium
Starting price
Free tier
Audience	Technical	Technical
API available
Open source
Self-hostable
Model provider	AssemblyAI (Universal-3 Pro, Universal-2, Universal-Streaming, Whisper-Streaming)	Rev AI (proprietary models trained on 7M+ hours of human-verified speech data)
Founded	2017	2010
Headquarters	San Francisco, United States	San Francisco, USA
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	·Industry-leading Word Error Rate (WER) across diverse accents, genders, and nationalities ·Supports 57+ languages with context-aware translation ·HIPAA, SOC II, GDPR, and PCI compliant with 99.99% uptime ·Both async (pre-recorded) and streaming (real-time) speech-to-text APIs