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Millis AI vs Ultravox: Which AI Voice & Speech Is Better in 2026?

Compare pricing, features, integrations, verified reviews, AI capabilities, security, and customer satisfaction, side by side, with no marketing spin.

Millis AI
Millis AI
Rating
,
Reviews
0
From
Custom

in AI Voice & Speech

Ultravox
Ultravox
Rating
,
Reviews
0
From
$0/mo

in AI Voice & Speech

Jump to scorecard Ask SIA

The Short Answer

Millis AI vs Ultravox, in 15 seconds

Choose Millis AI if…

  • You depend on a broad integration ecosystem
  • You need the broader feature set

Choose Ultravox if…

  • You want the lower entry price
  • You need a genuinely free plan
  • You want to trial before paying

Head-to-Head Scorecard

How Millis AI and Ultravox score

It's evenly matched, each leads on 2 of 9 measured dimensions.

  • Customer Rating

    Average score from verified user reviews

    Even
    Millis
    No reviews
    Ultravox
    No reviews

  • Review Volume

    Number of verified reviews, a proxy for adoption

    Even
    Millis
    0
    Ultravox
    0

  • Entry Pricing

    Lowest published starting price (free plan = lowest)

    Ultravox
    Millis
    Custom
    Ultravox
    $0/mo

  • Free Access

    Availability of a free plan and/or free trial

    Ultravox
    Millis
    Paid only
    Ultravox
    Free plan + trial

  • Integrations

    Number of listed third-party integrations

    Millis AI
    Millis
    6
    Ultravox
    3

  • Features

    Number of listed product capabilities

    Millis AI
    Millis
    8
    Ultravox
    6

  • AI Features

    Capabilities mentioning AI, automation or ML

    Even
    Millis
    ,
    Ultravox
    ,

  • Security & Compliance

    Number of listed compliance certifications

    Even
    Millis
    2
    Ultravox
    2

  • Platforms & Deployment

    Supported platforms and deployment options

    Even
    Millis
    3
    Ultravox
    3

Feature Comparison

Millis AI vs Ultravox feature breakdown

Search or filter the full feature matrix, core features, AI, integrations, APIs, security and compliance.

Millis AI
Ultravox
Overview
User rating
,
,
Pricing model
USAGE_BASED
USAGE_BASED
Starting price
Custom
$0/mo
Free version
Free trial
Features
Key capabilities
Voice agent builderAbout 600ms latencyInbound and outbound callingCalls in 100+ countriesWebhook integrationsCustom LLMs+2
Voice agentsSIP callingCustom voicesRAG corporaOutbound schedulerUnlimited playground
AI features
,
,
Integrations & API
Integrations
OpenAIMistralElevenLabsPlayHTCartesiaMake.com
TwilioWebRTCSIP
Public API
Platforms
Deployment
Cloud
Cloud
Platforms
WebAPI
APIWeb
Mobile support
Security & Compliance
Compliance
SOC 2HIPAA
SOC 2HIPAA
Vendor
Company
,
,
Verified
Founded
,
2022
Headquarters
,
Seattle, USA

Pricing Comparison

Millis AI vs Ultravox pricing

Entry pricing, plan tiers and the cost factors that shape total cost of ownership.

Millis AI

Custom to start
Platform fee$0/minute
  • Plus STT at $0.0043 per minute
  • LLM and TTS billed by provider
  • Volume discounts on ElevenLabs up to 25%

Ultravox

$0/mo to start
Pay as You GoFree
  • 30 free minutes then $0.05 per minute
  • 5 concurrent calls
Pro$100/month
  • No concurrency cap
  • Outbound scheduler
  • 20 RAG corpora
EnterpriseCustom
  • Priority SLA

Total cost of ownership factors

Free planMillis Ultravox
Free trial to evaluateMillis Ultravox
Transparent published pricingMillis Ultravox
Public API (build vs. buy add-ons)Millis Ultravox

Beyond list price, factor in implementation, training, add-ons and per-seat scaling when estimating total cost of ownership.

Pros & Cons

Millis AI vs Ultravox: strengths and trade-offs

Millis AI

Pros

  • Broad integration ecosystem (6)
  • Compliance: SOC 2, HIPAA
  • Public API available

Cons

  • No free plan
  • No free trial
  • Pricing is quote-based (less transparent)

Ultravox

Pros

  • Free plan available
  • Free trial offered
  • Compliance: SOC 2, HIPAA
  • Public API available

Cons

  • Fewer native integrations than the alternative

Buyer Fit

Who should use Millis AI vs Ultravox?

Startups

Ultravox

Ultravox keeps early-stage costs lowest with its entry tier.

Small businesses

Ultravox

Ultravox offers the most accessible pricing for lean teams.

Agencies

Millis AI

Millis AI connects to more tools for multi-client workflows.

Enterprises

Millis AI

Millis AI leads on compliance and breadth for complex needs.

Ecommerce

Millis AI

Millis AI integrates with more of the commerce stack.

SaaS companies

Millis AI

Millis AI is the more developer- and automation-friendly choice.

Integration overlap

Only in Millis AI (6)

OpenAIMistralElevenLabsPlayHTCartesiaMake.com

Only in Ultravox (3)

TwilioWebRTCSIP

Keep Exploring

Other alternatives worth considering

Similar ai voice & speech products buyers compare alongside Millis AI and Ultravox.

Thoughtly

Thoughtly

$500/mo
Pipecat

Pipecat

Free
Gnani.ai

Gnani.ai

Custom
Replicant

Replicant

Custom
Smith.ai

Smith.ai

$300/mo
More Millis AI alternatives →More Ultravox alternatives →

Ask SIA which solution fits your business

SIA, Saaskart's AI buying assistant, weighs Millis AI and Ultravox against your team size, budget, integrations and compliance needs, then recommends the right fit and the questions to ask each vendor.

Get a personalised recommendation

Millis AI vs Ultravox, Frequently Asked Questions

What is the difference between Millis AI and Ultravox?

Millis AI and Ultravox are both AI Voice & Speech solutions. Millis AI is rated 0.0/5 by 0 users, while Ultravox is rated 0.0/5 by 0 users. The main differences lie in pricing, features, and target audience.

Which is better, Millis AI or Ultravox?

Based on user ratings, Millis AI scores higher at 0.0/5. The best choice depends on your team size, budget, and specific requirements.

Which is cheaper, Millis AI or Ultravox?

Ultravox is the more affordable option, starting at $0/month.

Does Millis AI or Ultravox have a free plan?

Ultravox offers a free plan. Millis AI does not have a free tier but does offer a free trial.

Can I switch from Millis AI to Ultravox?

Switching between Millis AI and Ultravox is possible. Both support data export. Check integration compatibility and plan for data migration to minimise disruption to your team.

Who should use Millis AI vs Ultravox?

Millis AI is best suited for teams that prioritise enterprise features. Ultravox works well for teams looking to start free and scale.

Our Verdict

The bottom line on Millis AI vs Ultravox

Best Overall

Either

It's a tie balances user satisfaction and proven adoption.

Best for Startups

Ultravox

Ultravox has the friendliest entry point for new teams.

Best for Enterprise

Millis AI

Millis AI leads on compliance and feature breadth.

Best Value

Ultravox

Ultravox delivers the lowest cost to get started.

Best AI Features

Either

Comparable AI capabilities on both sides.

Highest Rated

Either

Both earn equal user ratings.

Ready to decide between Millis AI and Ultravox?

Visit Millis AI Visit Ultravox Ask SIA
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