# Ultravox.ai

**Source:** https://www.startuphub.ai/startups/ultravox-ai
**Profile type:** Startup

> Ultravox.ai (formerly Fixie.ai) is building human-like voice AI agents and models for natural, real-time communication.

## About

Ultravox.ai, formerly known as Fixie.ai, is focused on developing advanced AI models and a robust stack for building and scaling human-like voice AI agents. They aim to overcome the limitations of text-based LLMs by enabling AIs to communicate naturally in real-time, handling the complexities of human conversation like interruptions and rapid exchanges. Their flagship product, Ultravox, is an open-weight speech language model that has demonstrated superior performance over competitors like OpenAI's GPT-4o Realtime and Google's Gemini 1.5 Flash in speech understanding, transcription accuracy, and speech-based question answering. They offer APIs and SDKs for deploying these AI voice agents, catering to industries such as customer support, real-time translation, and call handling.

## Key facts

- **Slug:** ultravox-ai
- **Website:** https://ultravox.ai
- **Location:** San Francisco, United States
- **Founded:** 2022-01-01 00:00:00
- **Employees:** 16
- **Operating status:** Active
- **Total funding:** $10M
- **Sectors / tags:** Agentic AI, AI Agents, Foundation Model, Large Language Model, Voice AI, Generative AI, API Platform, Developer Tools, Customer Service, Voice Agent
- **Social:**
  - LinkedIn: https://www.linkedin.com/company/ultravox-ai
  - Twitter: https://x.com/ultravox_dot_ai
  - GitHub: https://github.com/fixie-ai

## Frequently asked

### What does Ultravox.ai do?

Ultravox.ai, formerly known as Fixie.ai, is focused on developing advanced AI models and a robust stack for building and scaling human-like voice AI agents. They aim to overcome the limitations of text-based LLMs by enabling AIs to communicate naturally in real-time, handling the complexities of human conversation like interruptions and rapid exchanges. Their flagship product, Ultravox, is an open-weight speech language model that has demonstrated superior performance over competitors like OpenA…

### What is Ultravox.ai's revenue?

StartupHub estimates Ultravox.ai's annual revenue at $3.2M (range $1.8M to $4.7M, 62% confidence), based on comparable companies in the sector.

### What is Ultravox.ai's valuation?

StartupHub estimates Ultravox.ai's effective valuation at $38.0M (range $25.0M to $60.0M, 10% confidence), based on comparable companies in the sector.

### How much funding has Ultravox.ai raised?

Ultravox.ai has raised a total of $10M in funding. The most recent round on record is Seed.

### Where is Ultravox.ai headquartered?

Ultravox.ai is headquartered in San Francisco, United States.

### When was Ultravox.ai founded?

Ultravox.ai was founded in 2022.

### What industry does Ultravox.ai operate in?

Ultravox.ai operates in Agentic AI, AI Agents, Foundation Model, Large Language Model, Voice AI, Generative AI.

### How many employees does Ultravox.ai have?

Ultravox.ai has approximately 16 people on record.

## JSON-LD

Structured data aligned with this page's `<script type="application/ld+json">` (included when the profile is server-rendered).

```json
{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "BreadcrumbList",
      "itemListElement": [
        {
          "@type": "ListItem",
          "position": 1,
          "name": "Home",
          "item": "https://www.startuphub.ai"
        },
        {
          "@type": "ListItem",
          "position": 2,
          "name": "Startups",
          "item": "https://www.startuphub.ai/startups"
        },
        {
          "@type": "ListItem",
          "position": 3,
          "name": "Ultravox.ai",
          "item": "https://www.startuphub.ai/startups/ultravox-ai"
        }
      ]
    },
    {
      "@type": "ProfilePage",
      "@id": "https://www.startuphub.ai/startups/ultravox-ai#webpage",
      "url": "https://www.startuphub.ai/startups/ultravox-ai",
      "name": "Ultravox.ai - AI Startup Profile | StartupHub.ai",
      "description": "This is the official profile of Ultravox.ai. Ultravox.ai is a startup founded in 2022, operating in Agentic AI and AI Agents. Ultravox.ai (formerly Fixie.ai) is building human-like voice AI agents and models for natural, real-time communication. Headquartered in San Francisco, United States. The company has approximately 16 employees.",
      "dateModified": "2026-07-14T09:44:47.64+00:00",
      "mainEntity": {
        "@id": "https://www.startuphub.ai/startups/ultravox-ai#organization"
      }
    },
    {
      "@type": "Organization",
      "@id": "https://www.startuphub.ai/startups/ultravox-ai#organization",
      "name": "Ultravox.ai",
      "url": "https://ultravox.ai",
      "logo": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/startups/1005039.jpg",
      "image": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/startups/1005039.jpg",
      "description": "This is the official profile of Ultravox.ai. Ultravox.ai is a startup founded in 2022, operating in Agentic AI and AI Agents. Ultravox.ai (formerly Fixie.ai) is building human-like voice AI agents and models for natural, real-time communication. Headquartered in San Francisco, United States. The company has approximately 16 employees.",
      "sameAs": [
        "https://www.linkedin.com/company/ultravox-ai",
        "https://x.com/ultravox_dot_ai",
        "https://github.com/fixie-ai",
        "https://www.startuphub.ai/startups/ultravox-ai"
      ],
      "foundingDate": "2022-01-01 00:00:00",
      "numberOfEmployees": {
        "@type": "QuantitativeValue",
        "value": 16
      },
      "address": {
        "@type": "PostalAddress",
        "addressLocality": "San Francisco",
        "addressCountry": "US"
      },
      "knowsAbout": [
        "Agentic AI",
        "AI Agents",
        "Foundation Model",
        "Large Language Model",
        "Voice AI",
        "Generative AI",
        "API Platform",
        "Developer Tools",
        "Customer Service",
        "Voice Agent"
      ]
    }
  ]
}
```