Overview

Socials:

Ultravox is a real-time voice AI platform for building fast, fluent conversational experiences.

With developer-friendly APIs, agentic-ready primitives, and a speech-native model, Ultravox makes it easy to build voice agents that follow instructions reliably, interact with third-party systems effectively, and communicate naturally.

Legacy voice AI systems orchestrate a series of independent component services that form a connected pipeline, which is subject to unpredictable latency. Ultravox controls and manages our entire inference stack and infrastructure, so we can guarantee reliability and availability at scale.

Each voice AI call through Ultravox Realtime is assigned dedicated GPU resources for the entire lifespan of the call, ensuring a consistent low-latency experience regardless of demand on our system, even for users with thousands of concurrent calls.

Join thousands of teams building natural, conversational voice AI agents with Ultravox.

Supported features

Releases

Ultravox.aiv0.7

Ultravox.aiInitial

Get notified when a new version of Ultravox.ai is released

Notify me

Ultravox.ai v0.7

Mar 30, 2026

In the v0.7 series, the Ultravox model is trained on GLM 4.6, taking the lead on audio reasoning tasks over closed source models like gpt4o-audio, while retaining advantages in speech understanding from previous versions.

Ultravox is a multimodal model that can consume both speech and text as input (e.g., a text system prompt and voice user message). The input to the model is given as a text prompt with a special pseudo-token, and the model processor will replace this magic token with embeddings derived from the input audio. Using the merged embeddings as input, the model will then generate output text as usual.

2 0

Author

Ultravox Team

@ultravox-team

www.ultravox.ai

Company

Fixie.ai

🇺🇸 United States

Stats

1 tool

Beginner

Joined: March 2026

Pricing

Pricing model

Free Trial

Paid options from

$0.07/unit

Billing frequency

Pay-as-you-go

Keeping you safe

Good to know

Terms & Conditions

Use tool

Save

🔗 Copy link

🗳️ Vote Best AI Tool

Featured

Voice Agents Ultravox.ai

US Fixie.ai Voice agents

1,855

No ratings

Overview Releases Alternatives Pricing Pros & Cons Prompts Reviews Q&A

Use tool

Save

Other tools by Fixie.ai

Fixie.ai

Build custom conversational AI agents quickly.

Chatbots

Open

Share

🇺🇸 United States
Released 3y ago
No pricing

813
1

Also used for

Voice cloning29 0 Voice assistants10 0 Voice detection2 0 Voice task management3 0

Top alternatives

Speechmatics | AI Voice Agents

Build smarter AI voice agents with the best speech recognition technology

Voice agents

Open

193,735 www.speechmatics.com

Share

🇬🇧 United Kingdom
Released 8mo ago
#37 in Trending

204,240
86
4.5
Layercode

Build low-latency voice AI agents effortlessly.

Voice agents

Open

18,180 layercode.com

Share

Released 7mo ago
Free + from $250/mo

18,657
6
Calldock

Add AI voice agents to your website in minutes.

Voice agents

Open

14,626 calldock.co

Share

Released 11mo ago
Free + from $41/mo

15,474
21
5.0
Vozexo - Dental Answering Service | 24/7 AI for Dentists

The AI voice agent that closes deals.

Voice agents

Open

13,455 vozexo.com

Share

Released 5mo ago
From $49/mo

14,810
13
VoiceAIWrapper

Connect any Voice AI under your brand

Voice agents

Open

9,601 voiceaiwrapper.com

Jake Sullivan

🙏 4 karma

Jul 9, 2025

@VoiceAIWrapper

I really liked the agency billing with stripe really makes it easier to charge my clients and show their campaign results

2 Reply Share Edit Delete Report

Share

Released 10mo ago
Free + from $29/mo

11,726
22
5.0
Monobot

AI voice agents that automate BPO tasks.

Voice Agents

Open

10,227 monobot.ai

Share

Released 6mo ago
From $200

10,801
5
5.0

Reviews

No ratings yet.

★ ★ ★ ★ ★ 0

★ ★ ★ ★ 0

★ ★ ★ 0

★ ★ 0

★ 0

Your rating

★ ★ ★ ★ ★

Post

How would you rate Ultravox.ai?

Help other people by letting them know if this AI was useful.

Prompts & Results

Title:

Description:

Prompt type:*

Prompt:*

Output type:*

Output:*

Add your own prompts and outputs to help others understand how to use this AI.

Pros and Cons

Pros

Open-source

Bypasses text conversion

Web, native apps, telephone integrations

SDKs for major languages

Built-in Twilio support

Multi-language proficiency

Adapts new languages/accents

Allows any open-source model

Allows personal models

Direct speech recognition

Reliable and faster interactions

Fully customisable

Support for additional languages

Unique custom voices

High quality speech

Function calling feature

Voice cloning

RAG Support

Works with text-based prompts

Captures non-textual speech elements

View 15 more pros

Cons

Might struggle with dialects

Integration complexity in non-open source

Customization requires technical know-how

Adaption to new languages might be limited

Accuracy varies with accent

Q&A

What is Ultravox.ai?

Ultravox.ai is an open-source Speech Language Model (SLM) designed to understand and process speech in a similar manner to human interaction. This software excels in analyzing spoken language directly, bypassing the conventional text conversion process to enable more natural and fluid conversations. Ultravox can be integrated into web, native apps, or telephone-based products and supports multiple languages, allowing for smooth communication across diverse audiences. It can be customised extensively, enabling the addition of additional languages, fine-tuning on personal datasets, and creation of unique custom voices.

How does Ultravox.ai understand and process speech?

Ultravox.ai understands and processes speech by analyzing spoken language directly. It bypasses the conventional process of converting speech into text, allowing it to achieve more natural and fluent interactions. Its unique approach distinguishes it from typical voice systems that rely heavily on text conversion.

What platforms can integrate with Ultravox?

Ultravox can be integrated into various platforms including web-based, native apps, or telephone-based products. Its versatility and simplicity make it a perfect fit for diverse product types.

Does Ultravox support SDKs for all major languages?

Yes, Ultravox supports Software Development Kits (SDKs) for all major languages. The platform is built with broad compatibility and ease of integration in mind, enabling it to connect with a variety of programming languages.

How does Ultravox handle multi-language proficiency?

Ultravox boasts multi-language proficiency to ensure smooth communication across diverse audiences. Its sophisticated language processing capabilities enable it to fluently understand and respond in all major languages, making it suited for global applications.

Can Ultravox adapt to new languages or accents?

Yes, Ultravox has the capability to adapt to new languages or accents. Thanks to its adaptive learning feature, Ultravox ensures smooth and effective communication, even when dealing with new language inputs and varying accents.

+ Show 14 more

How can Ultravox integrate with other open-source models?

Ultravox.ai provides the flexibility to work with any open-source model. This includes personal models that have been finely tuned. It’s designed to accommodate a wide range of third-party models, promoting flexibility and diverse use cases.

What makes the speech recognition of Ultravox different from other voice systems?

Unlike other voice systems that rely on transforming speech into text, Ultravox integrates speech recognition directly. This approach makes it faster, more reliable, and enables more natural interactions. It reduces the project’s overall complexity and can capture the nuances of speech more accurately.

How can Ultravox be customised to specific needs?

Ultravox can be fully customised to align with specific needs. It’s open to adding support for additional languages, fine-tuning based on personal datasets, or creating unique custom voices. This customization capability ensures a more personalized and effective user experience.

What's the process for adding support for additional languages to Ultravox?

The process of adding additional languages to Ultravox involves customization of the base model to include the new language. However, the website does not provide explicit detailed instructions or the exact process for this.

How can I fine-tune Ultravox on my personal datasets?

Fine-tuning Ultravox on personal datasets would likely involve appending or training the model with the additional data. The explicit method or instructions to achieve this are however not outlined on their website.

Can I create unique custom voices with Ultravox?

Yes, Ultravox can be used to create unique custom voices. This customization capability is inherent in its design, allowing for a more individualized and tailored user experience.

Does Ultravox support deployment in my own cloud environment?

Indeed, Ultravox supports deployment directly in your own cloud environment, providing greater flexibility and control over the deployment and operation of the model.

What is the cost of using Ultravox?

The costing information for Ultravox use is listed as 5¢ per minute. However, they also mention being free to get started, suggesting there might be different tiers of usage or pricing.

Can Ultravox.ai handle interruptions in spoken language?

Yes, Ultravox can handle interruptions in spoken language. This feature is designed to accommodate the natural flow of conversation, where interruptions and overlapping speech may occur.

Is voice cloning possible with Ultravox?

The information offered about Ultravox mentions the capacity to create custom voices, which might infer the ability to clone voices. However, it doesn't explicitly say that voice cloning is a feature of Ultravox.

Can Ultravox work with existing text-based prompts?

Yes, Ultravox can work with existing text-based prompts; however, its superior value comes from its direct speech processing capabilities, bypassing the need to convert speech to text.

Is Ultravox capable of high-quality speech?

Yes, Ultravox is designed to produce high-quality speech, facilitating effective and clear communication in different interaction contexts.

How can I get started with Ultravox?

To get started with Ultravox, you can utilize their get started link provided on their website. Further instructions or processes are however not explicitly stated on their website.

What are the system requirements to run Ultravox?

Concrete system requirements to run Ultravox are not specified on their website. Considering it's described as being deployable in a cloud environment, there's a likelihood of it operating within fairly standard tech infrastructure. More specific requirements could be listed in more technical documentation or obtained directly from the Ultravox team.

Ask a question

Submit

Search

Ultravox.aiv0.7

Overview

Supported features

Releases

Ultravox Team

Pricing

Other tools by Fixie.ai

Also used for

Top alternatives

Related topics

Reviews

How would you rate Ultravox.ai?

Prompts & Results

Pros and Cons

Pros

View 15 more pros

Cons

Q&A

Go to section

Search

Overview

Supported features

Releases

Ultravox Team

Pricing

Other tools by Fixie.ai

Also used for

Top alternatives

Related topics

Reviews

How would you rate Ultravox.ai?

Prompts & Results

Pros and Cons

Pros

View 15 more pros

Cons

Q&A

Help

People also viewed

Feedback and Incident Report

AI Options

Task Options

Create AI Tools

Mini Tool

Vibe code an AI Tool