AssemblyAI vs Cartesia
Which Developer Tools AI tool is better in 2026?
AssemblyAI
AI models for accurate speech recognition
Cartesia
Ultra-fast voice AI for real-time applications
Side-by-side
| AssemblyAI | Cartesia | |
|---|---|---|
| Tagline | AI models for accurate speech recognition | Ultra-fast voice AI for real-time applications |
| Founded | 2017 | 2023 |
| HQ | San Francisco, US | San Francisco, US |
| Employees | 100-200 | 20-50 |
| Total funding | $78M | $65M |
| Latest round | series-b · Sep 2022 | Series A |
| Valuation | $500M | $400M |
| Cheapest paid plan | — | — |
| Free plan | ✗ | ✓ Free Tier |
| Free trial | ✗ | ✓ |
| Top tier price | Custom / Enterprise · Contact sales | Custom / Enterprise · Contact sales |
| Pricing summary | 2 published plans | 2 published plans |
| Categories |
Capability matrix
Developer-facing capabilities and access signals for AssemblyAI and Cartesia.
| Capability | AssemblyAI | Cartesia |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 7 (Python, TypeScript, JavaScript, Go…) | 2 (Python, JavaScript/TypeScript) |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✓ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of AssemblyAI
- Has raised more capital ($78M vs $65M)
- More mature (2017)
🔵 Strengths of Cartesia
- Offers a free plan
- Offers a free trial
- Newer company (2023)
Which should you choose?
Choose AssemblyAI if price matters most — it starts at Freemium, which is friendlier for teams watching burn. Both AI Developer Tools tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose AssemblyAI if you want the most established option — it has raised $78M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
AssemblyAI vs Cartesia — which is better?
It depends on your priority. AssemblyAI has raised more capital and is the more established option; Cartesia has broader feature depth. See the side-by-side table above.
Is AssemblyAI cheaper than Cartesia?
Yes — AssemblyAI's cheapest paid plan is Freemium, while Cartesia's is Free.
Do AssemblyAI and Cartesia offer free plans?
AssemblyAI: Paid only. Cartesia: Yes, has a free plan.
Explore more AI Developer Tools tools
Contextual paths to related AI startups, deals and rankings.