Head-to-head
AssemblyAI vs Rev AI
AssemblyAI uniquely has 5 features.
From
Pay-per-use (per minute of audio processed)
Free plan
Yes — free tier with limited credits to try the API
The verdict
AssemblyAI or Rev AI?
Section 01
Pricing, plan by plan
Every plan each vendor publishes, monthly and yearly where both are offered.
AssemblyAI
Free Tier
Free
Up to 185 hours pre-recorded transcription and 333 hours streaming transcription, no credit card required
Universal-3.5 Pro
$0.15/hr
Highly accurate STT model, 99 languages, 12.5M+ hours training data, no minimum commitment
Universal-3.5 Pro
$0.21/hr
Most accurate async STT model, 18 languages, native code-switching, best-in-class speaker diarization
Enterprise / Custom
Custom
Custom rate limits, enhanced concurrency, enterprise-grade flexibility, volume discounts, AWS Marketplace available
Rev AI
Rev AI does not publish a plan list we could read.
Section 02
Pros and cons
From each tool's full review, written from the same checked facts.
AssemblyAI
Pros
- Universal-3.5 Pro model supports native code-switching across 18 languages with an exceptionally fast real-time factor of 0.008x, making it viable for demanding production environments.
- Comprehensive API-first platform that goes well beyond transcription, including speaker diarization, sentiment analysis, topic detection, entity recognition, and PII redaction.
- Pre-recorded transcription API supports 99 languages via the Universal-2 model, offering broad global coverage.
- Includes a Voice Agent API and an LLM gateway that allows routing to models like GPT or Claude within the same pipeline.
- Medical Mode is available, indicating deliberate positioning for healthcare use cases with specialized transcription needs.
- Real-time streaming transcription is supported alongside pre-recorded audio, giving developers flexibility across different application types.
- Strong adoption among developers and engineering teams, with active discussion in forums and a reported user base of millions of developers.
Cons
- No consumer-facing dashboard — users cannot simply upload an audio file and download a transcript without developer setup.
- No text-to-speech, voice cloning, or music generation capabilities, limiting use cases strictly to speech input and understanding output.
- Limited public feedback on the Medical Mode feature makes it difficult to assess its real-world accuracy and reliability.
- The product is entirely API-first, meaning non-technical buyers or small teams without engineering resources are effectively excluded.
- Code-switching in the Universal-3.5 Pro model is limited to 18 languages, which may not cover all multilingual production needs.
- The broad surface area of the platform — transcription, voice agents, LLM gateway — may introduce integration complexity for teams building simple use cases.
Rev AI
Pros
- Transcription accuracy reputation consistently holds up better than most competitors in the same category, validated by G2 reviews.
- AI model was trained on over 7 million hours of human-verified audio, giving it a strong foundation for reliable speech recognition.
- Supports both real-time streaming transcription and batch processing for pre-recorded files, covering a wide range of use cases.
- Speaker diarization, word-level timestamps, and confidence scores are included in the standard output.
- Custom vocabulary feature allows domain-specific terms to be pushed into the model, improving accuracy for niche industries.
- REST-based API with SDKs for Python, Node.js, and Java, plus webhook support and thorough documentation.
- Recently integrated OpenAI Whisper models including Fusion and Medium, expanding transcription model options.
Cons
- Strictly a speech-to-text API with no text-to-speech, voice cloning, music generation, or noise removal capabilities.
- Sentiment analysis and topic extraction are repeatedly described by reviewers as secondary features rather than reliable core offerings.
- Narrow product scope means teams needing an all-in-one audio AI solution will need to integrate additional tools.
- No hands-on testing data available to independently verify streaming transcription performance claims.
- Call center and live captioning use cases dominate positive streaming reviews, suggesting limited validation in other real-time contexts.
Side by side
| Company | ||
| Founded | 2017 | 2010 |
| HQ | San Francisco, USA | San Francisco, USA |
| AI model | Universal-3.5 Pro (Proprietary) | Proprietary (trained on 7M+ hours of human-verified speech data) |
| User base | Millions of developers | — |
| Platforms | Web, API (all platforms via SDK) | Web, API, Cloud, On-Premises |
| Languages | 99 (Universal-2), 18 (Universal-3.5 Pro) | 57+ |
| Pricing | ||
| Pricing model | Credit-based | Credit-based |
| Free plan | Yes | Yes — free tier with limited credits to try the API |
| Free trial | Yes-unlimited (free tier, no credit card required — up to 185 hours pre-recorded, 333 hours streaming) | Yes — free trial available with no credit card required |
| Starting price | $0.15/hr | Pay-per-use (per minute of audio processed) |
| Enterprise | Custom pricing with custom rate limits, enhanced concurrency, and enterprise-grade flexibility | Custom — contact sales for enterprise pricing |
| All plans | Free Tier — Free Universal-3.5 Pro — $0.15/hr Universal-3.5 Pro — $0.21/hr Enterprise / Custom — Custom | — |
| Positioning | ||
| Best for | Developers and enterprises building voice AI applications, transcription services, and voice agents | Developers and enterprises needing high-accuracy speech-to-text API integration |
| Differentiator | Native code switching and highly accurate speaker diarization; async speech-to-text trained on 12.5M+ hours of audio | Rev AI offers industry-leading lowest Word Error Rate (WER) backed by 7M+ hours of human-verified training data, with significantly reduced bias across accents, genders, and ethnicities compared to competitors. |
| Competitors | Deepgram, OpenAI Whisper, Google Speech-to-Text, Amazon Transcribe, Rev.ai | AssemblyAI, Deepgram, Google Speech-to-Text, AWS Transcribe, OpenAI Whisper |
| Features | ||
| Async Speech to Text | ✓ | — |
| Async Transcription | ✓ | — |
| Code Switching | ✓ | — |
| Multi Language Support | ✓ | — |
| Speaker Diarization | ✓ | — |
| API Access | ✓ | ✓ |
| Audio Enhancement | ✕ | ✕ |
| Batch Processing | ✓ | ✓ |
| Commercial Rights | ✓ | ✓ |
| Languages Supported | ✓ | ✓ |
| Mobile App | ✕ | ✕ |
| Music Generation | ✕ | ✕ |
| Noise Removal | ✕ | ✕ |
| Podcast Editing | ✕ | ✕ |
| Text to Speech | ✕ | ✕ |
| Transcription | ✓ | ✓ |
| Voice Cloning | ✕ | ✕ |
| Voice Styles | ✕ | ✕ |
| Integrations | ||
| Adobe Audition | ✕ | ✕ |
| API Access | ✓ | ✓ |
| Garageband | ✕ | ✕ |
| Key Integrations | AWS Marketplace, GPT (LLM Gateway), Claude (LLM Gateway), Gemini (LLM Gateway), Community LLM Models, Python SDK, REST API, WebSocket Streaming API | REST API, Python SDK, Node.js SDK, Java SDK, cloud deployment, on-premises deployment |
Section 03
AssemblyAI vs Rev AI: common questions
Is AssemblyAI or Rev AI cheaper?
AssemblyAI's cheapest paid plan is $0.15/hr and Rev AI's is Pay-per-use (per minute of audio processed). Compare what each plan includes below before going on price alone.
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