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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.
Our verdict
Who it's for
Build and scale real-time, speech-native voice AI agents with low latency and natural interactions.
Who should look elsewhere
Speech generation feature is currently listed as 'Coming Soon'
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
Key features
- ✓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
- ✓Built-in tools for building and scaling voice agents
- ✓Telephony support with major providers
- ✓Dynamic Endpointing (UltraVAD v0.1) for conversation state prediction
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Free To Start | — | month | 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 | — | month | Designed for massive scale; We'll work with you to outline a plan that meets your needs |