Fixie

Fixie.ai now ships Ultravox — speech-native realtime voice ai agents and APIs.

Pricing

Free to start / Pay Go at $0/month with usage (about 5¢/min including TTS, up to 5 concurrent calls); Pro $100/month billed yearly; Enterprise custom.

Overview

Fixie is the company behind Ultravox, a realtime voice AI platform built on speech-native models rather than speech-to-text pipelines. Developers get REST APIs, web/mobile SDKs, tools, and telephony integrations for agents that speak and listen with low latency. Open-weight Ultravox models are published on Hugging Face. Branding on fixie.ai redirects into the Ultravox product.

Key features

Speech-native Ultravox models (no STT round-trip)
Realtime voice agent APIs and SDKs
Built-in tools and telephony provider integrations
Dedicated inference infrastructure
UltraVAD turn-taking model
Open weights on Hugging Face

Use cases

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Telephony IVR replacement

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Last updated 2026-09-16