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Fixie.ai

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Build and scale real-time, speech-native voice AI agents with low latency and natural interactions.

AI VoiceAI AgentsDeveloper Tools
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Reviews onG2
1 review tracked

The 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?

Editorial review
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

how we evaluateSourcefixie.ai ↗

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)

Fixie.ai holds an aggregate rating of 3.5 out of 5 from 1 reviews across G2, last checked March 19, 2026.

G21 reviews
3.5/5

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 Aug 20, 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
Calculate your costView full pricing

Is Fixie.ai worth the price?

75/100

Fixie.ai offers a fair pricing structure, particularly with its 'Free To Start' and 'Pay Go' options, making it accessible for experimentation.

The 'Pro' tier at $100/month is reasonably priced for scaling companies, especially given the removal of concurrency caps. This pricing model is best for developers and businesses looking to integrate real-time voice AI agents without significant upfront investment.

Hidden Costs & Gotchas

5¢/minute usage fee on Free/Pay Go

Potential high usage costs on Pay Go

Enterprise tier requires custom negotiation

How Fixie.ai Compares to Competitors

Compared to competitors like Deepgram or AssemblyAI, Fixie.ai's 'Free To Start' with a 5¢/minute usage fee is competitive for initial exploration. Deepgram offers a free tier with 10,000 minutes/month, while AssemblyAI has a free tier for up to 3 hours of audio. Fixie.ai's 'Pro' tier at $100/month for unlimited concurrency is a strong offering for growing businesses, potentially more flexible than usage-based models from other providers once scale is reached.

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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

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