Fixie.ai
Claim this toolBuild and scale real-time, speech-native voice AI agents with low latency and natural interactions.
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Reviews onG2
1 review trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Achieves real-time, natural conversations by processing speech directly
Biggest con
Speech generation feature is currently listed as 'Coming Soon'
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
What is Fixie.ai?
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.
Available on: Web
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
Pricing checked Jul 1, 2026
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
Reviews
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Fixie.ai FAQ
How does Fixie.ai's Ultravox.ai platform achieve natural voice interactions?
Fixie.ai's Ultravox.ai processes speech directly, rather than converting it to text first. This method preserves paralinguistic signals like tone and cadence, which are essential for creating natural and human-like conversations in AI agents.
Which teams would benefit most from using Fixie.ai?
Teams and developers looking to integrate advanced voice AI capabilities into their applications will find Fixie.ai most beneficial. It is designed for those who need to build and scale real-time, speech-native voice AI agents with low latency.
How is Fixie.ai priced?
Fixie.ai is available on a free tier, allowing users to get started without initial cost. For more extensive usage and advanced features, paid plans are offered.
What kind of latency improvements does Fixie.ai offer compared to traditional voice AI systems?
Fixie.ai significantly reduces latency by processing speech directly, unlike traditional systems that rely on speech-to-text conversion. This speech-native approach, combined with dedicated infrastructure, enables faster and more natural interactions.
Can Fixie.ai integrate with existing telephony systems?
Yes, Fixie.ai provides telephony support, allowing for integration with major telephony providers. This enables companies to connect their voice AI agents to existing communication infrastructures.
How does Fixie.ai compare to AssemblyAI for real-time voice processing?
Fixie.ai's Ultravox.ai platform processes speech directly to maintain paralinguistic signals and reduce latency for real-time interactions. This contrasts with approaches that might rely on converting speech to text, which can introduce delays and lose conversational nuances.
Source: fixie.ai