Rev.ai API
Rev.ai provides a speech recognition API with async job-based transcription, real-time streaming, speaker diarization, and custom vocabulary, built on Rev's human-transcription heritage.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
TLS enforced. API keys have no scope granularity. HIPAA BAA available for healthcare workloads. Audio data deleted from Rev infrastructure after processing unless retention explicitly configured.
⚡ Reliability
Best When
An agent needs high-accuracy transcription with speaker diarization, can handle async job patterns, and benefits from custom vocabulary tuning.
Avoid When
You need the simplest possible integration with no callback handling, or cost per minute is the primary constraint.
Use Cases
- • Async batch transcription of call center recordings with automatic speaker labeling
- • Real-time streaming transcription for live meeting bots and voice agents
- • Podcast and video content indexing with speaker-attributed transcripts
- • Compliance and audit workflows requiring accurate verbatim transcription with confidence scores
- • Multilingual contact center analysis with custom vocabulary for industry-specific terms
Not For
- • Single-file quick transcriptions where a simpler synchronous API is preferable
- • Extremely low-cost transcription workloads — Rev.ai is priced for quality, not commodity
- • Environments that cannot make outbound webhook callbacks for job completion notifications
Interface
Authentication
API key passed as Authorization: Bearer header. Single key per account with no scope restrictions. Keys managed in Rev.ai dashboard.
Pricing
Free 300 minutes require no credit card. Speaker diarization is an add-on that increases per-minute cost. Volume discounts available for enterprise.
Agent Metadata
Known Gotchas
- ⚠ Jobs are async — agents must poll GET /jobs/{id} or configure a webhook callback_url; forgetting this leaves agents hanging
- ⚠ Job results expire after 30 days and are then deleted — agents that cache job IDs without fetching results will lose data
- ⚠ Media URL must be publicly accessible at submission time; pre-signed URLs that expire before Rev.ai fetches them cause silent job failures
- ⚠ Speaker diarization must be requested at job creation time and cannot be added to a completed job retroactively
- ⚠ The streaming API uses a different auth flow (token-based) than the async API (bearer key), which surprises agents that assume one credential works everywhere
Alternatives
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Scores are editorial opinions as of 2026-03-07.