Sierra
#2 Customer Supportby Sierra · Best for enterprise brands
Sierra, founded by Bret Taylor, builds branded conversational agents for large consumer companies — handling support, returns, subscription changes, and voice calls with deep integrations into order and account systems. Customers include major retail and subscription brands. Contracts are custom enterprise agreements, typically six figures annually.
Visit Sierra ↗Last verified June 10, 2026
Pricing
Custom enterprise
Outcome-based enterprise contracts
Free tier: No · Open source: No
Strengths
- + Sophisticated brand-voice and guardrail controls
- + Strong voice support
- + Deep systems integrations for real actions
Limitations
- − Enterprise-only; long procurement
- − Overkill below large ticket volumes
Best for
Consumer enterprisesVoice + chat supportHigh-volume B2C brands
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