AssemblyAI
Supabase
| Feature | AssemblyAI | Supabase |
|---|---|---|
| Pricing | Free / from $0.12/mo | Free / from $25/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.7 / 5 |
| Best For | developers, podcast-platforms, meeting-tools, media-companies | developers, startups, indie-hackers, full-stack-teams |
| Founded | 2017 | 2020 |
| Speech To Text | ✓ | ✗ |
| Real Time Transcription | ✓ | ✗ |
| Speaker Diarization | ✓ | ✗ |
| Sentiment Analysis | ✓ | ✗ |
| Topic Detection | ✓ | ✗ |
| Content Moderation | ✓ | ✗ |
| Summarization | ✓ | ✗ |
| Postgres Database | ✗ | ✓ |
| Authentication | ✗ | ✓ |
| Edge Functions | ✗ | ✓ |
| Real Time | ✗ | ✓ |
| Storage | ✗ | ✓ |
| Vector Embeddings | ✗ | ✓ |
| Self Hosting | ✗ | ✓ |
✓ 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
✓ Supabase Pros
- Full Postgres with SQL access
- Generous free tier (500MB, 50K monthly active users)
- Auth, storage, and edge functions included
- Open-source and self-hostable
✗ Supabase Cons
- Can be complex for non-developers
- Pauses inactive free projects after 7 days
- Real-time can be expensive at scale
The Verdict
AssemblyAI is built for developers and podcast platforms, with a focus on speech-to-text and real-time-transcription. Supabase targets developers and startups and leads with postgres-database and authentication.
On pricing, AssemblyAI is the clear winner for budget-conscious users — starting at $0.12/mo compared to $25/mo for Supabase. 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.
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.