AssemblyAI
Deepgram
| Feature | AssemblyAI | Deepgram |
|---|---|---|
| Pricing | Free / from $0.12/mo | Free / from $0.0036/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.4 / 5 |
| Best For | developers, podcast-platforms, meeting-tools, media-companies | developers, contact-centers, voice-ai-apps, real-time-applications |
| Founded | 2017 | 2015 |
| Speech To Text | ✓ | ✓ |
| Real Time Transcription | ✓ | ✗ |
| Speaker Diarization | ✓ | ✗ |
| Sentiment Analysis | ✓ | ✗ |
| Topic Detection | ✓ | ✓ |
| Content Moderation | ✓ | ✗ |
| Summarization | ✓ | ✗ |
| Text To Speech | ✗ | ✓ |
| Real Time Streaming | ✗ | ✓ |
| Language Detection | ✗ | ✓ |
| Custom Vocabulary | ✗ | ✓ |
| Smart Formatting | ✗ | ✓ |
✓ AssemblyAI Pros
- Industry-leading transcription accuracy
- Real-time and async transcription support
- Built-in audio intelligence (sentiment, topics, entities)
- Generous free tier with 100 hours included
✗ AssemblyAI Cons
- API-only (no consumer-facing UI)
- Per-hour pricing can add up for high volume
- Limited language support compared to competitors
✓ Deepgram Pros
- Extremely fast transcription (up to 40x real-time)
- Competitive accuracy with custom models
- Both STT and TTS in one platform
- Free $200 credit to start
✗ Deepgram Cons
- Developer-focused with no consumer app
- Custom model training requires enterprise plan
- Newer platform with less ecosystem maturity
The Verdict
AssemblyAI is built for developers and podcast platforms, with a focus on speech-to-text and real-time-transcription. Deepgram targets developers and contact centers and leads with speech-to-text and text-to-speech.
Both tools come in at similar price points ($0.12/mo for AssemblyAI, $0.0036/mo for Deepgram), so pricing won't make the decision for you.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Both tools are a solid fit for developers — in those cases, the decision often comes down to workflow style and how your team prefers to organize work.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.