VOICE AI COMPARISON
Compare Voice AI Platforms Side-by-Side
See Vapi and Retell AI compared across every dimension that matters — performance, AI providers, builder experience, call features, security, and pricing. Make an informed choice.
| Feature |  |  |
|---|---|---|
| Performance & Scale | ||
| Response Latency | < 500ms | ~600ms |
| Concurrency | 10 included, scalable | 20 free, scalable |
| Languages Supported | 100+ | 30+ |
| AI Providers | ||
| LLM Providers | OpenAIAnthropicGoogleGroqPerplexityAzureCustom | OpenAIAnthropicGoogleCustom |
| Speech-to-Text | DeepgramAssembly AIGladia | Retell Built-In |
| Text-to-Speech | ElevenLabsPlayHTCartesiaAzure | Retell PlatformElevenLabsCartesiaOpenAIMinimaxFish |
| Telephony Providers | TwilioTelnyxFive9GenesysAvaya | Retell TwilioTelnyxVonageCustom SIP |
| Custom Voice Cloning | ||
| Builder Experience | ||
| No-Code Builder | ||
| API-First Design | ||
| Knowledge Base | ||
| Simulation Testing | ||
| SDK & Integration | ||
| Web SDK | ||
| Mobile SDK | ||
| Server SDK | ||
| Webhooks | ||
| SIP Trunking | ||
| Call Features | ||
| Squad Orchestration | ||
| Call Transfer | ||
| Batch Calling | ||
| Branded Caller ID | ||
| Post-Call Analytics | ||
| Security & Compliance | ||
| Compliance Certs | SOC2HIPAAPCI | SOC2HIPAAGDPR |
| On-Premises Deployment | ||
| PII Redaction | ||
| Pricing | ||
| Free Tier | ||
| Free Credits | $10 free credits | $10 free credits |
| Base Per-Minute Price | $0.05/min + model costs | $0.07-0.31/min all-in |
| Enterprise Pricing | ||