Retell AI vs Voiceflow

For no-code agency deploys with white-label resale, Voiceflow offers full white-label and sub-account support while Retell AI's support is only partial. Both have no-code builders and self-serve signup. On cost, Voiceflow carries a $60/mo platform fee versus Retell AI's $0/mo, but Voiceflow's lower base per-minute rate of $0.05 versus $0.07 and full white-label capability matter more for agency resale margins and branding requirements. The full white-label feature is the decisive factor here.

For engineering teams needing custom pipeline control, Retell AI offers native SIP trunking, DTMF/IVR navigation, bring-your-own LLM, bring-your-own TTS voice, and a $0/mo platform fee with no annual contract required. The $0 platform fee compares favorably to Voiceflow's $60/mo, while both platforms remain API-first. Retell's base concurrency of 20 calls versus Voiceflow's 5 provides more headroom for complex pipelines out of the box. Native SIP trunking support further enables the deep telephony pipeline customization that engineering teams typically require.

For ecommerce support, Voiceflow integrates natively with Shopify and Zendesk, which are core ecommerce and helpdesk platforms. Retell AI lists Make, Twilio, HubSpot, and GHL but includes neither Shopify nor Zendesk. Voiceflow also offers full white-label sub-accounts, useful for multi-brand ecommerce, versus Retell AI's partial support. On cost, Voiceflow's base rate of $0.05/min is lower than Retell AI's $0.07/min, though Voiceflow carries a $60/mo platform fee. The native Shopify integration is the decisive factor for ecommerce order flows.

Both tools restrict HIPAA compliance to non-base plans. Retell AI requires an enterprise tier for a HIPAA BAA, meaning standard plans are not HIPAA-covered. Voiceflow has no HIPAA information in the provided facts at all, making it impossible to confirm coverage. Neither tool is clearly superior for HIPAA-bound healthcare workflows based on the available facts. Both share SOC 2 Type II and GDPR tooling, but those do not substitute for a HIPAA BAA. Without a confirmed BAA on accessible plans for either tool, no winner can be determined.

Both tools support native outbound campaigns, but Retell AI has meaningful cost and scale advantages for high-volume outbound sales. Retell AI charges no monthly platform fee ($0/mo vs Voiceflow's $60/mo) and includes 20 concurrent calls on the base plan vs Voiceflow's 5. Retell AI telephony runs $0.01/min vs Voiceflow's $0.05/min, reducing per-call costs significantly at volume. Retell AI also offers native SIP trunking and warm transfer, both critical for sales call centers. The margin is narrow rather than clear, however, because Voiceflow offers full white-label support and some Voiceflow cost estimates are not vendor-confirmed.

For an SMB receptionist and booking use case, cost and out-of-the-box telephony features matter most. Retell AI has no monthly platform fee versus Voiceflow's estimated $60 per month, making it significantly cheaper for a small business. Retell also includes 20 concurrent calls at base versus Voiceflow's 5, better handling busy periods. Retell offers native SIP trunking, number provisioning, warm transfer, DTMF/IVR, and outbound campaigns, all vendor-confirmed, which are core receptionist needs. Telephony per-minute cost is also lower at $0.01 versus $0.05 for Voiceflow. The margin is narrow because Voiceflow has a lower base per-minute rate at $0.05 versus $0.07, but the platform fee and concurrency gap favor Retell at SMB scale.