Sierra

AI platform for building and deploying conversational agents across customer service channels.

Overview

Sierra is a conversational AI platform designed to help businesses build and deploy intelligent customer service agents. The platform features Ghostwriter, an agent-building tool that can create production-ready, multilingual agents from SOPs, transcripts, or plain English descriptions. Sierra enables companies to unify customer interactions across multiple channels including chat, SMS, WhatsApp, email, voice, and ChatGPT, while maintaining personalized experiences at scale.

Key features

Ghostwriter agent builder
Multi-channel deployment (chat, SMS, WhatsApp, email, voice)
Agent performance analytics and deep research
Automated agent optimization
Long-horizon planning and customer context memory
Outcome-based pricing model
Built-in compliance and security guardrails
Multivariate testing and experimentation

Pros

Rapid agent creation from various input formats
Unified deployment across multiple communication channels
Outcome-based pricing ensures ROI alignment
Advanced analytics and monitoring capabilities
Supports complex, long-term customer interactions
Enterprise-grade security and compliance

Cons

Requires integration with existing business systems
Learning curve for optimizing agent performance
Pricing model may vary based on usage outcomes
Limited information on free tier availability

Use this if

You need to build and deploy AI customer service agents across multiple channels with minimal engineering overhead, or want outcome-based pricing aligned with business results.

Skip this if

You need a simple, lightweight chatbot solution or prefer traditional per-user pricing models.

Best for

Enterprises seeking to automate customer serviceMulti-channel customer engagementBuilding AI agents without extensive engineeringRevenue-focused customer experience optimizationFinancial services and healthcare organizations

Alternatives

IntercomZendeskFreshdeskDriftGorgiasAda

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