AssemblyAI vs Deepgram
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Freemium
Speech AI APIs for transcription, speaker detection, summaries and audio intelligence.
AI tool · Freemium
Speech-to-text, text-to-speech and voice-agent APIs for developers, with real-time streaming.
The short answer
Choose AssemblyAI if you need…
- Developers transcribing recordings
- Call analytics
Choose Deepgram if you need…
- Real-time transcription in apps
- Voice agent backends
Side-by-side
| AssemblyAI | Deepgram | |
|---|---|---|
| Type | Audio & voice · Voice AI APIs | Audio & voice · Voice AI APIs |
| Price | Freemium | Freemium |
| Platforms | API | API |
| Works with | — | — |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
AssemblyAI
Speech AI APIs for transcription, speaker detection, summaries and audio intelligence. Well-documented and accurate. Per-hour pricing needs monitoring at volume.
Deepgram
Speech-to-text, text-to-speech and voice-agent APIs for developers, with real-time streaming. Fast and accurate at scale. Requires engineering work to integrate.
Best for
AssemblyAI
- Developers transcribing recordings
- Call analytics
Deepgram
- Real-time transcription in apps
- Voice agent backends
Strengths
AssemblyAI
- Speech-to-text
- Speaker diarisation
- Summaries and topic detection
- Streaming
Deepgram
- Streaming speech-to-text
- Text-to-speech
- Voice agent API
- Diarisation
Frequently asked questions
What is the difference between AssemblyAI and Deepgram?
AssemblyAI: Speech AI APIs for transcription, speaker detection, summaries and audio intelligence. Deepgram: Speech-to-text, text-to-speech and voice-agent APIs for developers, with real-time streaming. AssemblyAI suits developers transcribing recordings, while Deepgram suits real-time transcription in apps.
Are AssemblyAI and Deepgram free?
AssemblyAI: Freemium. Deepgram: Freemium.
What are other alternatives to AssemblyAI and Deepgram?
Other options people compare them with include Cartesia.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.