AssemblyAI vs Vapi
Which Agents AI tool is better in 2026?
AssemblyAI
AI models for accurate speech recognition
Vapi
Build, test and deploy voicebots in minutes rather than months
Side-by-side
AssemblyAI leads on both fronts — more capital raised ($78M) and a lower entry price than Vapi.
| Metric | AssemblyAI | Vapi |
|---|---|---|
| Taglinei | AI models for accurate speech recognition | Build, test and deploy voicebots in minutes rather than months |
| Foundedi | 2017🏆 | 2024 |
| HQi | San Francisco, US | US |
| Employeesi | 100-200🏆 | — |
| Neuron scorei | 48🏆 | 47 |
| Total fundingi | $78M🏆 | $50M |
| Latest roundi | Series B · Sep 2022 | Series B · May 2026 |
| Valuationi | $500M | $500M |
| Cheapest paid plani | —🏆 | — |
| Free plani | ✗ | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Custom / Enterprise · Contact sales | Enterprise · Contact sales |
| Pricing summaryi | 2 published plans | 2 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for AssemblyAI and Vapi.
| Capability | AssemblyAI | Vapi |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | 7 (Python, TypeScript, JavaScript, Go…) | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✓ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of AssemblyAI
- Has raised more capital ($78M vs $50M)
- Higher Neuron score (48 vs 47)
- More mature (2017)
- Verified profile
🔵 Strengths of Vapi
- Newer company (2024)
Which should you choose?
Choose AssemblyAI if price matters most — it starts at Freemium, which is friendlier for teams watching burn. Both AI Agents 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 Vapi — which is better?
It depends on your priority. AssemblyAI has raised more capital and is the more established option; Vapi has broader feature depth. See the side-by-side table above.
Is AssemblyAI cheaper than Vapi?
Yes — AssemblyAI's cheapest paid plan is Freemium, while Vapi's is Freemium.
Do AssemblyAI and Vapi offer free plans?
AssemblyAI: Paid only. Vapi: Paid only.
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