AssemblyAI vs Speechmatics
No clear leader: Speechmatics (81.4) and AssemblyAI (80.2) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
Capabilities
Feature-by-feature on the axes that matter for speech to text. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
AssemblyAI
A platform providing speech-to-text APIs for both pre-recorded and live audio, voice agent capabilities, and audio analysis features like speaker identification and sentiment analysis. Serves millions of developers with focus on accuracy and scalability.
Speechmatics
Speech recognition and synthesis platform offering real-time and batch transcription, audio analysis, and text-to-speech across 55+ languages. Supports flexible deployment with privacy-first design and compliance-ready infrastructure.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
AssemblyAI
From $0.37/hour for async transcription. Free tier available.
- Async Speech-to-Text$0.37/hour
- Real-time Speech-to-Text$0.47/hour
- Sync Speech-to-Text$0.45/hour
Speechmatics
Usage-based from $0.24/hour; free tier with $100 credit; volume discounts available
- FreeFree
- Speech-to-Text (55+ languages)
- Text-to-Speech (English)
- Multi-region cloud options
- 2 concurrent real-time sessions
- ProUsage-based from $0.24/hour for Real-time Standard transcription
- Speech-to-Text (55+ languages)
- Text-to-Speech
- Real-time sessions (up to 50 concurrent)
- Speaker diarization
- Custom vocabulary
- +5 more
- EnterpriseContact sales
- Unlimited concurrent real-time sessions
- No rate limits
- Custom models and voices
- Custom language development
- SaaS or on-premises or on-device deployment
- +3 more
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
AssemblyAI
- Semantic Kernel .NET
- Vercel AI SDK
- OpenAI GPT-5.6 Luna
- OpenAI GPT-5.6 Terra
- Google Gemini
Speechmatics
- Stenograph CATalyst VP
- Adobe Premiere
- Zapier
- Twilio
- Python SDK
- JavaScript SDK
- .NET SDK
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.