Retell AI charges per minute and uses half-duplex voice. Duvox is self-hosted, full-duplex, and built for real estate cold calling at scale.
Retell AI uses a cascaded pipeline: speech-to-text, then LLM, then text-to-speech. This creates 1-2 second pauses between turns. Duvox uses full-duplex AI that listens and speaks simultaneously. No awkward silences.
Retell charges $0.07-0.20+ per minute of call time. At 500 calls per day, that adds up fast. Duvox is self-hosted. You pay for your own infrastructure. No per-minute API fees eating into your margins.
Retell is a general-purpose voice API. Duvox is built specifically for real estate cold calling with campaign management, lead sequences, and CRM sync out of the box.
Duvox gives you full control over your voice AI stack. Bring your own LLM, TTS provider, and telephony. No vendor lock-in. No surprise pricing changes.
| Feature | Duvox | Retell AI |
|---|---|---|
| Full-duplex voice | ||
| Self-hosted option | ||
| Per-minute API fees | ||
| Real estate templates | ||
| Campaign management | ||
| Lead upload + sequences | ||
| CRM integration | Via Zapier | |
| Call analytics | ||
| Number rotation | ||
| Appointment booking | Via integration | |
| Custom voice cloning | ||
| Webcall testing |
Pricing based on publicly available information as of February 2026. Subject to change.
Join the waitlist for early access. Limited spots for launch partners who want to shape the product.