What is AssemblyAI?
AssemblyAI is a company offering AI models that transcribe and analyze speech, delivered mainly as APIs for developers. Its product line is grouped into transcription (pre-recorded, realtime and synchronous speech-to-text), understanding (speech understanding, guardrails and safety, an LLM gateway), and interaction (a voice agent API, a dictation API and text-to-speech, the last marked as coming soon). Self-hosted and cloud deployment options are listed under inference.
In practice, a team sends audio to the API and receives text, along with added analysis of the conversation. The site lists use cases such as voice agents, AI notetakers, call analytics, medical transcription, dictation, agent assist and AI scribes, with support for 99 languages. The Dictation API is presented as a product that returns clean, ready-to-send text by removing filler words, resolving self-corrections and spelling names correctly. The site names Zoom and Siro as customers.
Key features
- Pre-recorded speech-to-text API
- Realtime speech-to-text API
- Speech understanding API
- Voice agent API
- Dictation API that removes filler words and resolves self-corrections
- Self-hosted and cloud deployment options
Who is it for
- Developers building voice features
- Companies building voice agents or call analytics
- Healthcare teams needing medical transcription
- Teams building notetaking or AI scribe products
Pros and cons
- Support for 99 languages
- Separate realtime and pre-recorded transcription options
- Self-hosted deployment is available
- Text-to-speech is listed as coming soon
- Developer-oriented, not a ready-made end-user app
AssemblyAI pricing
The vendor does not publish prices in a readable form (often pricing is shown only after signing in).
Is AssemblyAI free?
The vendor does not state this clearly on the homepage or pricing page.
AssemblyAI alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Deepgram | 0.0048 USD/mo | trial | APIs & models |
 Cartesia | 5 USD/mo | yes | APIs & models |
 LocalAI | not listed | yes | APIs & models |
 Hume AI | not listed | ? | APIs & models |
 Google AI Studio | 0,75 USD | ? | APIs & models |
 OpenAI Platform | 0,10 USD | ? | APIs & models |
All alternatives to AssemblyAI →
FAQ
What is AssemblyAI used for?
Speech-to-text and speech understanding API models for developers building voice features into apps, agents and call tools.
Is AssemblyAI free?
The vendor does not state this clearly on the homepage or pricing page.
How much does AssemblyAI cost?
The vendor does not publish prices publicly or requires sign-in.
What are the best AssemblyAI alternatives?
Closest alternatives: Deepgram, Cartesia, LocalAI, Hume AI, Google AI Studio.
Data checked October 12, 2026 on the vendor website (assemblyai.com).