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Enterprise voice AI

Sierra

Enterprise customer-experience AI agents with a voice product for inbound and outbound calls in 55+ languages.

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Key facts

Starts at: Quote
Billing model: Quote only
Per-minute rate (or overage): Not published
Price per call: Not published
Included on entry plan: Not published
Overage: Not published
Free plan / trial: Not published
HIPAA: Not stated
Languages: 55+ languages
Human backup: Not stated
Integrations: Not published
Contract: Not published
Industries: General small business

Platform facts

Latency (vendor claim): Low-latency voice (no figure published) · Deliver low-latency voice interactions that handle interruptions (source)
Outbound calling: Yes · across inbound and outbound calls (source)

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

Sierra alternatives

15 vendors with the most overlap: Ada Voice, Capacity AI Agents, Decagon, Leaping AI, Regal, Skit.ai, Aircall AI Voice Agent, Amazon Connect and more. Compare all 15 Sierra alternatives →

Sierra compared

Decagon vs Sierra Cresta vs Sierra Parloa vs Sierra Bland AI vs Sierra Retell AI vs Sierra NiCE Cognigy vs Sierra

Lists that include Sierra

Best AI outbound calling software Best AI call center software Best AI agents for call centers

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Badges for Sierra

Free for Sierra to embed. Each badge links back to this profile and is served from aireceptionistsranked.com. Rank badges state a position in our published-data order (price published first, then how complete the public facts are), not a score or a test result. If the position changes, the old badge URL redirects to the current one, or to the Listed-on badge if Sierra leaves that list. Dark versions: replace _light_ with _dark_.

Listed on

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#29 in AI call center · ranked by public data (position in our published-data order on /ai-call-center/, not a quality rating)

<a href="https://aireceptionistsranked.com/vendors/sierra/?ref=badge" rel="noopener" title="#29 in AI call center · ranked by public data: AI Receptionists Ranked">
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       width="300" height="90" alt="#29 in AI call center · ranked by public data: AI Receptionists Ranked">
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Listed on · AI call center

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

Sources

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