Retell AI vs Ultravox

For no-code agency deploys and white-label resale, Retell AI offers a dedicated no-code agent builder while Ultravox does not. Retell AI also provides partial white-label and sub-account support for agencies, while Ultravox offers none. Additionally, Retell AI includes a simulation and testing suite and broader native integrations including Go High Level and HubSpot, all critical for agency workflows. Ultravox lacks these features entirely.

For custom pipeline control by engineering teams, Retell AI supports bring-your-own LLM, giving teams direct model control, while Ultravox does not. Retell AI also includes a simulation and testing suite, which Ultravox lacks, and this is critical for iterating on custom pipelines. Both platforms are API-first, but Retell's bring-your-own LLM support and testing tooling give engineering teams meaningfully more pipeline control.

For ecommerce support and order flows, Retell AI holds several decisive advantages. Its no-code agent builder lets non-technical teams configure order and support workflows without engineering help, while Ultravox lacks this capability. Retell AI also includes a simulation and testing suite to validate order flows before going live, which Ultravox does not offer. Retell AI integrates natively with HubSpot, Zapier-compatible tools, and Go High Level, which is critical for CRM-driven ecommerce. Its base concurrency of 20 calls versus Ultravox's 5 also supports the higher traffic volumes typical in ecommerce.

For HIPAA-bound healthcare workflows, HIPAA BAA availability is the critical requirement. Retell AI offers HIPAA BAA, though enterprise only per fact d14bad2a. No corresponding HIPAA fact exists for Ultravox, so it cannot be confirmed as HIPAA compliant. Retell AI also has SOC 2 Type II certification per fact d0356357, GDPR tooling per fact 76e59556, and consent and recording compliance tooling per fact c40b11ca, all strengthening its compliance posture. The margin is narrow because Retell AI HIPAA is enterprise only, not available on base plans.

For outbound sales campaigns, Retell AI wins on multiple dimensions. Its base concurrency is 20 calls vs Ultravox's 5 calls, critical for high-volume dialing. Real production costs range 0.085-0.415 vs Ultravox's flat 0.055, but Retell includes BYO LLM support, a no-code agent builder, a simulation and testing suite, and partial white-label capability, none of which Ultravox offers. Retell also has broader native integrations including Go High Level and HubSpot, which are standard in sales stacks. Ultravox lacks barge-in handling and a testing suite, both important for live sales call quality.

For an SMB receptionist and booking use case, Retell AI holds several decisive advantages. It offers a no-code agent builder, which SMBs need to set up agents without developers, while Ultravox does not. Retell AI also includes a simulation and testing suite that Ultravox lacks, reducing risk for SMB deployments. Retell AI bundles 20 concurrent calls on the base plan versus Ultravox's 5 (facts 11a9ed04, f004cce1), which matters during after-hours call spikes. Retell AI also provides broader native integrations, including HubSpot and Go High Level, both common SMB booking tools. Ultravox has an edge on price, but the operational feature gaps are decisive.