Millis AI vs Vapi

For no-code agency deployments and white-label resale, Vapi offers partial white-label and sub-account support plus a richer native integration set including GHL and Zapier, both of which are key agency tools. Millis AI has no white-label fact recorded and fewer agency-relevant integrations. Both platforms provide no-code builders, but Vapi's GHL integration and partial white-label capability give it a concrete edge for agency resale workflows.

Both tools are API-first with BYO-LLM and BYO-voice support, so core pipeline flexibility is equal. Vapi edges ahead for engineering teams through its simulation and testing suite, broader native integrations including GHL, Twilio, Telnyx, Zapier, Make, and Slack, and a $50M Series B suggesting deeper engineering investment. Millis AI lacks a documented testing suite and has fewer integration touchpoints. These advantages matter for teams building and validating complex custom pipelines.

For ecommerce support and order flows, integration breadth matters heavily. Vapi connects natively with GHL, Twilio, Telnyx, Zapier, Make, Slack, and Google Calendar, enabling order management and CRM workflows out of the box. Millis AI integrations are limited to Make.com, OpenAI, ElevenLabs, PlayHT, and Cartesia, with no CRM or commerce connectors listed. Vapi also includes a built-in knowledge base useful for product FAQs, warm transfer to human agents for escalations, and a testing suite for quality assurance. Production costs overlap in range, but Vapi has a tighter upper bound at $0.17 versus Millis at $0.66. The $50M Series B signals stronger platform reliability for production deployments.

For HIPAA-bound healthcare workflows, Vapi offers a HIPAA BAA as a paid addon, making it at least available. No corresponding HIPAA information exists for Millis AI. Vapi also provides GDPR tooling and consent/recording compliance features, and its $50M Series B funding suggests greater organizational maturity for meeting compliance obligations. The availability of a HIPAA BAA is the decisive differentiator here, even though it requires a paid addon rather than being included by default.

Both tools support native outbound campaigns and no-code builders. Vapi edges ahead for outbound sales at scale through broader native integrations including GHL and Zapier, a built-in knowledge base, warm transfer to human, DTMF/IVR navigation, a simulation and testing suite, and credibility from a $50M Series B. Millis AI has a lower base price at $0.02/min versus $0.05/min, but Vapi's real production cost tops out at $0.17/min compared to Millis at $0.66/min, making Vapi more predictable at volume.

For cost-sensitive SMBs running a receptionist or booking bot, per-minute cost matters significantly. Millis AI is priced at $0.02/min versus Vapi at $0.05/min, giving Millis a clear advertised cost advantage. Millis also carries a $0/mo platform fee and no noted annual contract requirement, while Vapi requires an annual contract for best pricing. Both share 600ms latency, a no-code builder, outbound campaigns, and self-serve signup. Vapi offers a built-in knowledge base, which helps for booking scenarios, but Millis supports 100 countries and native outbound campaigns. For budget-conscious SMBs, the cost differential is the deciding factor.