Voice Paid

Ultravox

Real-time speech language models for responsive voice AI agents

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PricingPaid
Starting price$0.05/min
Free planNo
Free trialYes
APIYes
Open sourceNo
DeploymentCloud
Last verifiedAugust 1, 2026
Overview

Tool overview

Ultravox is listed under Voice AI tools.

Summary

What is Ultravox?

Ultravox provides speech-language models and infrastructure for real-time voice agents. Developers can stream audio directly to the model, connect tools, manage calls, and build low-latency conversational applications.

Best fit

Best for

Developers and teams building, operating, or testing real-time voice agents

Audience

Who is it for?

Voice AI engineersContact center teamsProduct developersQA teams
Recommendation

Decision note

Accepted after independent V411 official-source verification. Run Preview first and visually verify controlled fields, Arabic v2 lists, outreach, affiliate evidence, lifecycle or rebrand status, and logo QA before Apply.

Capabilities

Key features

Direct speech-to-model conversational processing

Low-latency real-time audio streaming

Tool calling during voice conversations

APIs for calls and agent sessions

Workflows

Use cases

Building real-time voice assistants

Automating structured phone conversations

Adding voice interfaces to applications

Connecting agents with business tools

Strengths

Pros

  • Built for real-time conversational workflows
  • Supports modular voice infrastructure
  • Useful for testing or deploying phone agents
Considerations

Cons

  • Latency depends on the full provider stack
  • Telephony costs remain separate
  • Production reliability needs extensive testing
Considerations

Limitations

Voice systems combine speech recognition, models, synthesis, telephony, and business logic. Teams must test latency, accents, interruptions, privacy, fallback behavior, and call compliance. Recordings and consent requirements also vary by jurisdiction.

Cost

Pricing details

Pricing modelPaid
Starting price$0.05/min
Free planNo
Free trialYes
Pricing context

Billing options

Usage-basedAnnual ProEnterprise custom
Pricing context

Pricing note

Ultravox includes the first 30 minutes free, then charges $0.05 per minute on pay as you go. PAYGO has no monthly platform fee and supports five concurrent calls. Pro is listed at $100 per month at the annual rate; Enterprise is custom. The free minutes are treated as an introductory trial allowance, not an ongoing free plan.

View official pricing
Compatibility

Supported languages

  • 42 human languages
Connectivity

Integrations

Twilio

SIP

WebSockets

WebRTC

ElevenLabs

Cartesia

Specs

Technical details

PlatformsWeb, API
Multilingual supportYes
Login requiredYes
Open sourceNo
DeploymentCloud
CompanyFixie, Inc.
Current versionUltravox v0.7
Models / versionsUltravox v0.7 UltraVAD v0.1
Editions / plansPay as you go Pro Enterprise
Data confidenceHigh
Last verifiedAugust 1, 2026
Documentation → Release notes → Data source →
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Answers

Frequently asked questions

Ultravox provides speech-language models and infrastructure for real-time voice agents. Developers can stream audio directly to the model, connect tools, manage calls, and build low-latency conversational applications.
Developers and teams building, operating, or testing real-time voice agents
The listed pricing model for Ultravox is Paid. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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