Rev AI

Free tier

The world's most accurate speech-to-text API for developers, built for speed and global scale.

Free tier available·Technical·Powered by Rev AI (proprietary models trained on 7M+ hours of human-verified speech data)·API available

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Key strengths

Industry-leading Word Error Rate (WER) across diverse accents, genders, and nationalitiesSupports 57+ languages with context-aware translationHIPAA, SOC II, GDPR, and PCI compliant with 99.99% uptimeBoth async (pre-recorded) and streaming (real-time) speech-to-text APIsAI Insights layer: sentiment analysis, topic extraction, summarization, and language identification

Free tier + paid plans

San Francisco, USA

Founded 2010

Self-hostable

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Rev AI exposes a REST API with two core speech-to-text modes: an Async API for batch processing of pre-recorded audio/video files, and a Streaming API for real-time transcription over WebSocket connections. Proprietary acoustic models are trained on over 7 million hours of human-verified speech data, delivering best-in-class Word Error Rate (WER) across 57+ languages. The platform also offers dedicated NLP endpoints for Topic Extraction, Sentiment Analysis, and Language Identification. Deployment options include cloud-hosted and on-premises (self-hosted) configurations, with full SOC II, HIPAA, GDPR, and PCI compliance baked in.

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