AssemblyAI
Convex
| Feature | AssemblyAI | Convex |
|---|---|---|
| Pricing | Free / from $0.12/mo | Free / from $25/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.5 / 5 |
| Best For | developers, podcast-platforms, meeting-tools, media-companies | full-stack-developers, real-time-apps, startups, rapid-prototyping |
| Founded | 2017 | 2021 |
| Speech To Text | ✓ | ✗ |
| Real Time Transcription | ✓ | ✗ |
| Speaker Diarization | ✓ | ✗ |
| Sentiment Analysis | ✓ | ✗ |
| Topic Detection | ✓ | ✗ |
| Content Moderation | ✓ | ✗ |
| Summarization | ✓ | ✗ |
| Real Time Database | ✗ | ✓ |
| Serverless Functions | ✗ | ✓ |
| File Storage | ✗ | ✓ |
| Authentication | ✗ | ✓ |
| Scheduling | ✗ | ✓ |
| Vector Search | ✗ | ✓ |
✓ 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
✓ Convex Pros
- Real-time by default
- TypeScript-first
- Built-in auth and file storage
- Automatic caching
✗ Convex Cons
- Vendor lock-in
- Newer platform
- Limited to Convex runtime
The Verdict
AssemblyAI is built for developers and podcast platforms, with a focus on speech-to-text and real-time-transcription. Convex targets full stack developers and real time apps and leads with real-time-database and serverless-functions.
On pricing, AssemblyAI is the clear winner for budget-conscious users — starting at $0.12/mo compared to $25/mo for Convex. That $24.88/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 Convex takes a more focused approach — which can mean a simpler, faster onboarding experience.
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.