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Voice agent platform

Ultravox

Speech-native real-time voice AI model and platform for developers.

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Key facts

Starts at: Free · $0.05/min after free usage.
Billing model: Pay as you go
Per-minute rate (or overage): $0.05
Price per call: Not published
Included on entry plan: Not published
Overage: Not published
Free plan / trial: Not published
HIPAA: Not stated
Languages: Not published
Human backup: Not stated
Integrations: Not published
Contract: Not published
Industries: General small business

Platform facts

Bring your own carrier / SIP: Yes · SIP Pricing (source)
Concurrency: Up to 5 concurrent calls on pay-as-you-go; no hard caps on paid tiers · Up to 5 concurrent calls || No hard caps on concurrency (source)
Outbound calling: Yes · Outbound Call Scheduler (source)

Sections: Voice AI platforms. Latency and concurrency are the vendor's claims; we have not measured them.

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Badges for Ultravox

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Listed on

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#14 in Voice AI platforms · ranked by public data (position in our published-data order on /voice-agents/, not a quality rating)

<a href="https://aireceptionistsranked.com/vendors/ultravox/?ref=badge" rel="noopener" title="#14 in Voice AI platforms · ranked by public data: AI Receptionists Ranked">
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       width="300" height="90" alt="#14 in Voice AI platforms · ranked by public data: AI Receptionists Ranked">
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Listed on · Voice AI platforms

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       width="300" height="90" alt="Listed on AI Receptionists Ranked: Voice AI platforms">
</a>

Sources

https://www.ultravox.ai/pricing

Checked Oct 26, 2026 on the vendor's own site. Prices change; confirm with Ultravox before you buy. Spotted an error? Send a correction.