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.
The Short Answer
Millis AI vs Ultravox, in 15 seconds
Choose Millis AI if…
- You need the broader feature set
Choose Ultravox if…
- You want the lower entry price
- You need a genuinely free plan
Head-to-Head Scorecard
How Millis AI and Ultravox score
Ultravox leads on 2 of 9 measured dimensions.
- Even
Customer Rating
Average score from verified user reviews
MillisNo reviewsUltravoxNo reviews - Even
Review Volume
Number of verified reviews, a proxy for adoption
Millis0Ultravox0 - Ultravox
Entry Pricing
Lowest published starting price (free plan = lowest)
MillisCustomUltravoxFree - Ultravox
Free Access
Availability of a free plan and/or free trial
MillisFree trialUltravoxFree plan + trial - Even
Integrations
Number of listed third-party integrations
Millis6Ultravox6 - Millis AI
Features
Number of listed product capabilities
Millis6Ultravox5 - Even
AI Features
Capabilities mentioning AI, automation or ML
Millis,Ultravox, - Even
Security & Compliance
Number of listed compliance certifications
Millis2Ultravox2 - Even
Platforms & Deployment
Supported platforms and deployment options
Millis4Ultravox4
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
UltravoxPricing 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- Integrations
- Low-latency streaming
- Email support
- Voice agent APIs
- Function calling
- Dedicated support
- SSO and admin controls
- Everything in Pro
Ultravox
Free to start- Limited monthly usage
- Speech-native model
- Community support
- Higher usage limits
- Email support
- Speech-native model
- Integrations
- Dedicated support
- Telephony integration
- Everything in Pro
- Open-weight model
Total cost of ownership factors
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
- Free trial offered
- Compliance: SOC 2, HIPAA
- Public API available
Cons
- No free plan
- Pricing is quote-based (less transparent)
Ultravox
Pros
- Free plan available
- Free trial offered
- Compliance: SOC 2, HIPAA
- Public API available
Cons
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
Either
Either integrates with more of the commerce stack.
SaaS companies
Millis AI
Millis AI is the more developer- and automation-friendly choice.
Integration overlap
Shared integrations (6)
Only in Millis AI (0)
Only in Ultravox (0)
Keep Exploring
Other alternatives worth considering
Similar ai voice & speech products buyers compare alongside Millis AI and Ultravox.
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 recommendationMillis 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 with a free plan available.
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.