Fixie.ai
UnclaimedBuild and scale real-time, speech-native voice AI agents with low latency and natural interactions.
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What is Fixie.ai?
Fixie.ai (ai voice): Build and scale real-time, speech-native voice AI agents with low latency and natural interactions. Ultravox.ai, developed by Fixie.ai, is a real-time, speech-native voice AI platform designed to overcome the limitations of traditional voice AI systems. Unlike approaches that convert speech to text, Ultravox.ai processes speech directly, preserving paralinguistic signals like tone and cadence, which are crucial for natural human conversation. Key capabilities: Speech-native model processing (Ultravox v0.7), Low-latency, real-time voice AI infrastructure, Fully managed inference stack, Robust REST APIs for integration, Intuitive SDKs for web and mobile platforms. Fixie.ai ships a free plan plus paid tiers that unlock as usage grows. Buyers most often compare Fixie.ai against ElevenLabs, AssemblyAI, Listnr.
TL;DR - Fixie.ai
- Develop real-time, speech-native voice AI agents.
- Reduces latency and preserves paralinguistic cues for natural conversations.
- Offers robust APIs, SDKs, and telephony support for easy integration and scaling.
Pricing: Free plan available
Best for: Growing teams
Pros & Cons
Pros
- Achieves real-time, natural conversations by processing speech directly
- Significantly reduces latency compared to text-based voice AI systems
- Preserves paralinguistic signals like tone and cadence for more human-like interactions
- Offers a comprehensive suite of developer tools and APIs for easy integration
- Provides dedicated infrastructure for consistent performance and scalability
Cons
- Speech generation feature is currently listed as 'Coming Soon'
- Enterprise pricing requires custom contact, lacking transparency for large-scale users
- The 'Pro' plan is billed yearly, which might not suit all users
Ratings Across the Web
3.5(1 reviews)
Ratings aggregated from independent review platforms. Learn more
Preview
Key Features
Speech-native model processing (Ultravox v0.7)Low-latency, real-time voice AI infrastructureFully managed inference stackRobust REST APIs for integrationIntuitive SDKs for web and mobile platformsBuilt-in tools for building and scaling voice agentsTelephony support with major providersDynamic Endpointing (UltraVAD v0.1) for conversation state prediction
Pricing Plans
Free To Start
Free
- 5¢ per minute (including TTS)
- Up to 5 concurrent calls
Pay Go
$0/month
- Perfect for just starting out and experimenting
- Pay as you go with some hard limits
Pro
$100/month
- Perfect for companies that are starting to scale
- No hard caps on concurrency
Enterprise
Contact Us
- Designed for massive scale
- We'll work with you to outline a plan that meets your needs
About Fixie.ai
By Toolradar Team·
Ultravox.ai, developed by Fixie.ai, is a real-time, speech-native voice AI platform designed to overcome the limitations of traditional voice AI systems. Unlike approaches that convert speech to text, Ultravox.ai processes speech directly, preserving paralinguistic signals like tone and cadence, which are crucial for natural human conversation. This speech-native approach, combined with a fully managed inference stack and dedicated infrastructure, significantly reduces latency, allowing for fast, natural, and scalable voice AI agents.
The platform is built for developers and companies looking to integrate advanced voice AI capabilities into their applications. It offers robust APIs, intuitive developer kits for web and mobile, and built-in tools to help build and scale voice agents. Ultravox.ai also provides telephony support for integration with major providers. By focusing on a unified stack for audio intelligence, Ultravox.ai aims to enable the creation of highly performant voice agents that can speak, listen, and interact in real-time, mimicking human communication more effectively than existing solutions.
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Fixie.ai FAQ
How does Ultravox address the latency and loss of paralinguistic signals common in other voice AI systems?
Ultravox tackles these issues by employing a speech-native model, which processes audio directly without first converting it to text. This approach preserves paralinguistic cues like tone and cadence, and by managing its full inference stack and infrastructure, Ultravox minimizes latency often introduced by external LLMs or shared inference pools.
What is the performance of Ultravox v0.7 on the Big Bench Audio score?
Ultravox v0.7 achieves a score of 91.8% on Big Bench Audio without reasoning capabilities. When thinking is enabled, its performance increases to an industry-leading 97%.
How does UltraVAD v0.1 contribute to more natural voice AI interactions?
UltraVAD v0.1 is a neural Voice Activity Detection (VAD) model that predicts conversation states and turn-taking. It recognizes when a user has likely finished speaking, identifies typical pause patterns, and distinguishes between thoughtful pauses and the end of a turn, leading to more fluid conversations.
What are the key components of the Ultravox Realtime Platform for developers?
The Ultravox Realtime Platform offers robust REST APIs for easy integration and intuitive SDKs compatible with major web and mobile platforms. It also includes built-in tools to help build and scale voice agents, along with integrations for large telephony providers.
What is the pricing structure for using Ultravox, specifically for initial experimentation?
Ultravox offers a 'Free To Start' option, which costs 5¢ per minute (including Text-to-Speech) and supports up to 5 concurrent calls. This plan is designed for initial experimentation and has some limits on concurrency.
In what ways does Ultravox contribute to open science?
Ultravox is built on open-weight models and is committed to sharing its research and findings. This dedication to open science aims to advance humanity's progress in the field of AI, with models available on Hugging Face.
Source: fixie.ai