AssemblyAI
Exa
| Feature | AssemblyAI | Exa |
|---|---|---|
| Pricing | Free / from $0.12/mo | Free / from $100/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.2 / 5 |
| Best For | developers, podcast-platforms, meeting-tools, media-companies | ai-developers, researchers, data-scientists, startup-builders |
| Founded | 2017 | 2022 |
| Speech To Text | ✓ | ✗ |
| Real Time Transcription | ✓ | ✗ |
| Speaker Diarization | ✓ | ✗ |
| Sentiment Analysis | ✓ | ✗ |
| Topic Detection | ✓ | ✗ |
| Content Moderation | ✓ | ✗ |
| Summarization | ✓ | ✗ |
| Neural Search | ✗ | ✓ |
| Content Retrieval | ✗ | ✓ |
| Similarity Search | ✗ | ✓ |
| Filtering | ✗ | ✓ |
| Auto Search | ✗ | ✓ |
| Api Access | ✗ | ✓ |
✓ 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
✓ Exa Pros
- Semantic search beyond keywords
- Clean API for developers
- Returns full page content
- Excellent for AI agent use cases
✗ Exa Cons
- Developer-focused - no consumer product
- Free tier has limited requests
- Results can be unpredictable
The Verdict
AssemblyAI is built for developers and podcast platforms, with a focus on speech-to-text and real-time-transcription. Exa targets ai developers and researchers and leads with neural-search and content-retrieval.
On pricing, AssemblyAI is the clear winner for budget-conscious users — starting at $0.12/mo compared to $100/mo for Exa. That $99.88/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Feature-wise, AssemblyAI offers broader built-in capabilities (7 features vs 6), while Exa takes a more focused approach — which can mean a simpler, faster onboarding experience.
Bottom line: AssemblyAI has a slight overall edge — but if semantic search beyond keywords matters most to you, Exa may still be the right call.