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Real-time voice AI infrastructure for building voice agents
Updated
Ultravox is a real-time voice AI infrastructure layer that powers fast, natural and scalable voice agents.
Developers build agents on the Ultravox API and connect calls through SIP or WebRTC. Concurrency is capped at 5 calls on pay as you go and removed on Pro.
Developers and companies building phone and web voice agents who want usage-based pricing without surge pricing.
Pay as You Go gives 30 free minutes then $0.05 per minute. Pro is $100 per month with no concurrency cap. Enterprise is custom.
Pipecat is an open-source voice framework, Millis AI is a voice agent API and Replicant sells contact center automation. Ultravox is a hosted voice infrastructure with published per-minute rates.
Pricing Model
USAGE BASED
Starting Price
$0/mo
Free Options
Free version, Free trial
| Feature | Pay as You Go | Pro | Enterprise |
|---|---|---|---|
| 30 free minutes then $0.05 per minute | , | , | |
| 5 concurrent calls | , | , | |
| No concurrency cap | , | , | |
| Outbound scheduler | , | , | |
| 20 RAG corpora | , | , | |
| Priority SLA | , | , |
Other
Missing an integration?
API Types
SDK Availability
Verify SDK availability in vendor's documentation.
Developer Features
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Compliance Standards
SOC 2 Type II
EnterpriseISO 27001
EnterpriseGDPR Compliant
GlobalHIPAA
HealthcarePCI DSS
FinanceCCPA
PrivacyFedRAMP
GovernmentCSA STAR
CloudDeployment & Data
Data Residency Options
Verify with vendor for your specific region requirements.
24/7 live receptionists for calls and lead intake
Open-source framework for real-time voice and multimodal AI agents
Low-latency voice agent platform priced from $0.02 per minute
No-code AI voice agents for inbound and outbound calls
