Ultravox (formerly Fixie.ai) is a voice agents tool with a free tier. We looked at what you actually get, what real users say, and whether the price matches the value. Here's our take.
Ultravox (formerly Fixie.ai) is worth it if you need voice agents tools. Speech-native model processes audio directly, eliminating stt→llm→tts pipeline latency and producing sub-second response times that feel conversational rather than transactional. makes it a solid choice.
💰 Bottom line: Free gets you real-time, speech-native voice ai platform that processes audio directly without text conversion, enabling fast, natural voice conversations for ai agents with sub-second latency and preservation of paralinguistic signals
For Free, here's what that buys you:
$0/mo ÷ 8 hours saved = $0.00 per hour of value
Compare that to hiring a $voice agents professional at $40/hour
Even at minimum wage ($15/hr), Ultravox (formerly Fixie.ai) saves you $120 over doing it manually.
We're not here to sell you Ultravox (formerly Fixie.ai). Here's what you should know before buying:
Quick comparison (not a full review):
Vapi is a voice ai agents tool for AI receptionists, sales qualification calls.
Vapi: Better if you need their specific features
Ultravox (formerly Fixie.ai): Better if you need comprehensive features
Voice AI platform for building conversational phone agents with human-like speech, ultra-low latency, and natural turn-taking for call center automation.
Retell AI: Better if you need Teams and professionals who need reliable voice agents capabilities with proven results and good integration support
Ultravox (formerly Fixie.ai): Better if you need comprehensive features
Enterprise conversational AI platform for building voice agents that handle inbound and outbound phone calls with sub-300ms latency, warm transfers, and comprehensive telephony integrations.
Bland AI: Better if you need Large enterprises and regulated industries requiring self-hosted voice AI infrastructure with maximum security, compliance, and scale for high-volume customer communications and complex integration requirements.
Ultravox (formerly Fixie.ai): Better if you need comprehensive features
| Use Case | Verdict | Why |
|---|---|---|
| Freelancers | ⚠️ | Affordable for solo professionals |
| Students | ✅ | Free tier available for learning |
| Small Teams (2-10) | ⚠️ | Check if team features are available |
| Enterprise | ⚠️ | Enterprise features and support needed |
Ultravox (formerly Fixie.ai) may have a learning curve for beginners. Consider starting with the free tier before committing to paid plans.
Ultravox (formerly Fixie.ai) remains relevant in 2026 with Continued investment in the speech-native Ultravox model with improved turn-taking, interruption handling, and lower tail latency for production phone workloads.,Expanded telephony and WebRTC integration paths, making it easier to ship phone agents without building custom media servers.,Stronger emphasis on tool calling inside live voice sessions, positioning Ultravox as the voice layer for agentic applications rather than just a conversational endpoint.,Ongoing release of open-weight Ultravox model variants on Hugging Face, broadening self-hosting options for compliance-sensitive teams.,Refined developer experience around the JavaScript SDK and agent configuration following the Fixie.ai → Ultravox rebrand and product consolidation.. The voice agents market continues to grow, making it a solid investment for professionals.
The free tier covers basic needs but upgrading unlocks advanced features like premium functionality. Most professionals will need the paid version.
Compare the features you actually need against each plan to find the best value for your use case.
While there are other voice agents tools available, Ultravox (formerly Fixie.ai)'s feature set and reliability often justify its pricing. Compare alternatives carefully.
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Last verified March 2026