Azure Speech (STT) vs Rev.ai
Speech-to-Text
| A Azure Speech (STT) | R Rev.ai | |
|---|---|---|
| Free tier | ✓ Free tier | ✓ Free tier |
| Pricing model | usage | usage |
| Price | $1 (Standard (1 hour)) | $0.02 (per minute) |
| Features | ||
| Languages | en, ja, zh, ko, fr, de | en |
| API | ✓ Available Docs ↗ | ✓ Available Docs ↗ |
| Homepage | Azure Speech (STT) ↗ | Rev.ai ↗ |
| Pricing Plans | Free$05 audio hours/mo free Standard$1/hrReal-time and batch Custom Speech$1.40/hr + training feeDomain-specific model fine-tuning | Free$0300 minutes free on signup Pay-as-you-go$0.02/min asyncStreaming at $0.021/min EnterpriseCustomVolume discounts, dedicated infrastructure |
| Platforms | ||
| Integrations | Azure Bot Service, Power Platform, Teams, Dynamics 365, REST API / SDK | Webhooks, Python SDK, Node.js SDK, REST API |
- Real-time and batch transcription with speaker diarization
- Custom Speech for domain-specific vocabulary fine-tuning
- 100+ language support—broadest among cloud STT providers
- Deep Azure ecosystem integration
- Custom model training adds complexity and cost
- SDK verbosity compared to Deepgram or AssemblyAI
- Latency slightly higher than Deepgram on real-time tasks
- Backed by Rev's human transcription quality baseline
- Reliable async and real-time transcription
- Speaker diarization and custom vocabulary support
- 300 free minutes for new accounts
- English-only—no multilingual support
- Accuracy slightly below Deepgram Nova-2 on noisy audio
- Fewer AI intelligence features than AssemblyAI
Our Verdict
- You prefer Azure Speech (STT)'s overall approach
- You prefer Rev.ai's overall approach
AI Commentary
Azure Speech STT is the strongest enterprise STT offering for breadth of language support and compliance requirements. Custom Speech allows organizations to fine-tune models on proprietary vocabulary—critical for medical, legal, and technical domains. Real-time and batch modes are both well-supported. Its main competitive disadvantage versus Deepgram is slightly higher latency on streaming transcription tasks.
Rev.ai benefits from Rev's long history as a human transcription company, providing a quality-focused reputation that resonates with media and legal customers. The API is straightforward to integrate with good SDK support. However, it is English-only and lacks the AI intelligence layer (summaries, sentiment) that AssemblyAI provides. It sits in a competitive middle ground where Deepgram often wins on speed and AssemblyAI on features.
