VAPI vs Retell AI: Which Voice AI Platform Should You Build On?

Both VAPI and Retell AI can power production voice agents. The right choice depends on call-flow complexity, engineering preferences, integration needs, voice quality, monitoring, and cost at expected call volume. Decision rules: Choose based on your workflow requirements, not only demo voice quality. Test with real call recordings, interruptions, and noisy environments before committing. Model total cost using expected monthly call minutes, not just platform pricing pages.