Rev.ai
The API spin-off of Rev — strong English accuracy, topic detection, custom vocab.
The API spin-off of Rev — strong English accuracy, topic detection, custom vocab.
Best for english-heavy workloads where vocabulary customization matters (medical, legal, technical). Pricing: from $0.02/min.
What it is
Rev.ai is the developer API from Rev, historically a human-transcription service. The "Machine" endpoint is competitive on English and supports custom vocabulary that handles jargon better than generic Whisper. HIPAA-eligible on appropriate plans. Last price check: 2026-04-20.
Watch out for: Pricier than Whisper-based APIs; non-English coverage narrower.
Install / use
Features
| Speaker diarization | Yes |
| Word-level timestamps | Yes |
| Streaming / real-time | Yes |
| Languages supported | 36 |
| HIPAA eligible | Yes |
Rev.ai vs Whipscribe
| Feature | Rev.ai | Whipscribe |
|---|---|---|
| Category | Transcription APIs | Transcription APIs |
| Pricing | from $0.02/min | free beta |
| Speaker diarization | Yes | Yes |
| Word timestamps | Yes | Yes |
| Streaming | Yes | No |
| Languages | 36 | 99 |
| Platforms | API | Web, API, MCP |
Sources & dates for the comparison above
- diarization: “Diarization groups words by speaker in the response.” — source (checked 2026-04-23)
- word timestamps: “Each element has a type, value, timestamp ts and end_ts in seconds.” — source (checked 2026-04-23)
- streaming: “Rev AI's Streaming API accepts live audio over WebSockets.” — source (checked 2026-04-23)
- pricing: “Asynchronous speech-to-text starts at $0.02 per minute.” — source (checked 2026-04-23)
Alternatives to Rev.ai
Whipscribe is a managed faster-whisper + whisperX service. If you want transcripts without running infrastructure, paste a URL or drop a file in the form below — you'll have a transcript in seconds.