# Millis AI vs Vapi

> Millis AI vs Vapi: Millis AI for ai receptionists, Vapi for agencies. Base rates $0.02 vs $0.05/min. They split on base price / min and real production cost /.

![Millis AI logo](https://www.versusref.com/logos/millis.png) ![Vapi logo](https://www.versusref.com/logos/vapi.png)

Millis AI (Low-latency voice agents) and Vapi (Dev-first API platform, full pipeline control) are Voice AI platforms, priced from $0.02/min and $0.05/min respectively. Below: the bottom line, verified head-to-head facts, and real production costs.

Voice AI platforms · 34 facts compared · all sourced · pricing verified Jul 15, 2026

## Bottom line

These tools split by team type. Vapi suits larger or compliance-sensitive teams: a $50M Series B signals stability, GDPR and HIPAA tooling is included, real production cost tops at $0.17/min versus Millis AI's estimated $0.66/min, and it offers a testing suite plus broader integrations including GHL and Twilio. Millis AI suits cost-sensitive early-stage builders: its base price is $0.02/min versus Vapi's $0.05/min, with no platform fee and simpler onboarding. Both share 600ms latency, BYO LLM, SIP trunking, and no-code builders, so feature parity across core capabilities is high.

## Verdict summary

| Use case | Winner | Why |
| --- | --- | --- |
| No-code agency deploys | Vapi | For no-code agency deployments and white-label resale, Vapi offers partial white-label and sub-account support (fact 7496ef62) plus a richer native integration set including GHL and Zapier (fact 70764157), both of which are key agency tools. |
| Custom pipeline control | Vapi | Both tools are API-first with BYO-LLM and BYO-voice support, so core pipeline flexibility is equal. |
| Ecommerce support and orders | Vapi | For ecommerce support and order flows, integration breadth matters heavily. |
| Healthcare compliance | Vapi | For HIPAA-bound healthcare workflows, Vapi offers a HIPAA BAA as a paid addon, making it at least available. |
| Outbound sales campaigns | Vapi | Both tools support native outbound campaigns and no-code builders. |
| SMB receptionist and booking | Millis AI | For cost-sensitive SMBs running a receptionist or booking bot, per-minute cost matters significantly. |

## Millis AI vs Vapi: head-to-head facts

| Fact | Millis AI | Vapi | Verified |
| --- | --- | --- | --- |
| Base price / min | ~$0.02 ([source](https://www.millis.ai/)) | ~$0.05 ([source](https://vapi.ai/pricing)) | Jul 15 |
| Real production cost / min | $0.06-0.66 ([source](https://coldiq.com/tools/millis-ai)) | ~$0.05-0.17 ([source](https://vapi.ai/pricing)) | Jul 15 |
| HIPAA BAA on base plan | n/a | ◑  Paid add-on ([source](https://vapi.ai/pricing)) | Jul 15 |
| Native SIP trunking | ✓  Yes ([source](https://docs.millis.ai/introduction)) | ✓  Yes ([source](https://docs.vapi.ai/quickstart/introduction)) | Jul 15 |
| Concurrency limit (base) | n/a | ~10 calls ([source](https://vapi.ai/pricing)) | Jul 15 |
| Median e2e latency | ~600 ms ([source](https://www.millis.ai/)) | ~600 ms ([source](https://docs.vapi.ai/quickstart/introduction)) | Jul 15 |
| Bring-your-own LLM | ✓  Yes ([source](https://www.millis.ai/)) | ✓  Yes ([source](https://vapi.ai/pricing)) | Jul 15 |
| Free tier credit | n/a | 60+ minutes included ([source](https://vapi.ai/pricing)) | Jul 15 |

## Millis AI vs Vapi pricing: true cost at 3 usage tiers

All-in monthly: platform fee + per-minute + telephony. Assumes GPT-4o class model, ElevenLabs voice.

| Volume | Buyer | Millis AI | Vapi | Note |
| --- | --- | --- | --- | --- |
| 1K min/mo | Solo builder | $360 | $110 | Includes estimated telephony. Free credits can offset the first month. |
| 10K min/mo | Agency | $3,600 | $1,100 | Volume pricing typically starts to apply at this tier. |
| 100K min/mo | Call center | $36,000 | $11,000 | Both platforms offer custom contracts at this tier. Negotiate. |

## Millis AI vs Vapi: verdicts by use case

### No-code agency deploys → Vapi

For no-code agency deployments and white-label resale, Vapi offers partial white-label and sub-account support (fact 7496ef62) plus a richer native integration set including GHL and Zapier (fact 70764157), both of which are key agency tools. Millis AI has no white-label fact recorded and fewer agency-relevant integrations (fact 0c7f300e). 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.

### Custom pipeline control → Vapi

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.

### Ecommerce support and orders → Vapi

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.

### Healthcare compliance → Vapi

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.

### Outbound sales campaigns → Vapi

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.

### SMB receptionist and booking → Millis AI

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.

## Millis AI vs Vapi: common questions

### Which is cheaper per minute, Vapi or Millis AI?

Millis AI has a lower base price at $0.02/min compared to Vapi at $0.05/min. However, real production costs tell a different story. Millis AI real costs range from $0.06 to $0.66/min, while Vapi real costs range from $0.05 to $0.17/min. Your actual bill depends heavily on the LLM and TTS services you choose.

### Is there a free trial or free tier for Vapi or Millis AI?

Vapi offers 60+ minutes of free credit to start. Both platforms charge $0 per month as a platform fee, meaning you pay only for usage. Millis AI also supports self-serve signup with no monthly platform fee.

### Does Vapi or Millis AI support HIPAA compliance?

Vapi offers a HIPAA BAA, but only as a paid add-on rather than a feature included in the base plan. No HIPAA-related information is available for Millis AI. Vapi also lacks SOC 2 Type II certification. Both gaps should be factored into any healthcare deployment decision.

### How does latency compare between Vapi and Millis AI?

Both platforms report an identical median end-to-end latency of 600 ms, so latency alone should not be a differentiator when choosing between the two tools.

### Can I bring my own LLM and TTS voice to Vapi or Millis AI?

Both platforms support bring-your-own LLM and bring-your-own TTS voice. Vapi also passes through LLM and TTS costs at cost with no markup. This gives developers the flexibility to optimize for price or model quality.

### Which tool has better native integrations, Vapi or Millis AI?

Vapi integrates natively with GHL, Twilio, Telnyx, Slack, Google Calendar, Zapier, and Make. Millis AI integrates with Make.com, OpenAI, ElevenLabs, PlayHT, and Cartesia. Vapi covers more CRM and telephony options, while Millis AI focuses on AI voice service providers.

### What concurrency limits apply on the base plan for Vapi or Millis AI?

Vapi includes 10 concurrent calls on its base plan, with additional concurrent lines available at $10 per month each. No concurrency limit details are available for Millis AI. If high concurrency is critical, confirm Millis AI limits directly before committing.

### Which platform is more credible or established, Vapi or Millis AI?

Vapi has raised a $50M Series B funding round, giving it a well-documented funding track record. Millis AI is operated by TMate Inc., and no funding information is publicly available for it. Both platforms offer self-serve signups and API-first architectures, but Vapi has the clearer financial backing on record.

Source: https://www.versusref.com/voice-ai/millis-vs-vapi/