Sierra

Sierra is an AI platform for customer support teams to build and manage sophisticated, conversational AI agents. It enables you to unify...

Build, deploy, and optimize AI agents across all channels to transform your customer experience and increase lifetime value.

Unify chat, SMS, email, and voice with a single, intelligent agent that learns from every interaction and your existing SOPs.

Try Sierra Free

Pro fromPricing on request

OmnichannelAI Agent BuilderPersonalizationAnalyticsOutcome-Based Pricing

9.2 Zekai

Enterprise-Grade CX Automation

AI for Customer Support & Experience

Ease of Use

8.5

Accuracy

9.3

Value

9.0

Time Saving

9.5

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⚡ Quick answer

For large-scale customer support and CX, Sierra is a top contender. It builds and deploys sophisticated AI agents across all channels (chat, email, voice) from your existing documents, personalizes interactions with customer memory, and uniquely offers outcome-based pricing, ensuring you pay for results, not just usage.

CategoryCustomer Experience Automation

Best ForLarge enterprises unifying omnichannel support.

Price FromOn request

FreeNo

DifferentiatorBuilds agents from documents; outcome-based pricing.

ProofTestimonials from CEOs and C-level executives at 'leading brands'.

Rating4.6

📖 About Sierra

Sierra is an AI platform for customer support teams to build and manage sophisticated, conversational AI agents. It enables you to unify customer interactions across channels like chat, SMS, email, and voice, creating personalized experiences that boost customer lifetime value.

How It Works

Your workflow, automated

1

Build with Ghostwriter

Upload your SOPs, transcripts, and goals to have Ghostwriter build a production-ready agent automatically.

2

Deploy Omnichannel

Deploy your single, unified agent across chat, SMS, email, voice, and other customer touchpoints.

3

Optimize and Personalize

Use Insights Explorer and the Agent Data Platform to analyze performance, run tests, and personalize interactions.

Real Impact

Before & After

❌ Before

Inconsistent support across siloed channels

High Agent Workload

✅ After

A unified, personalized experience on every channel

Agents Focus on High-Value Tasks

Social Proof

Trusted by professionals

Ease of Use

8.5

Accuracy

9.3

Value

9.0

Time Saving

9.5

"Sierra is a genuine game-changer. We fed it our entire library of SOPs and had a functional, multichannel agent in days, not months. The outcome-based pricing sealed the deal for us."

David R., Head of CX · June 2026

"The ability to unify our customer experience across SMS, chat, and voice with a single brain is incredible. Our agent feels personal and our clients love the speed and accuracy."

Maria K., VP of Product · May 2026

"It's extremely powerful, but there's a definite learning curve. You need a clear data and process strategy to get the most out of it. Not a plug-and-play tool for a small team."

Ben S., Support Operations Manager · June 2026

"The insights we get from every interaction are invaluable. Sierra isn't just about automation; it's about building a smarter, more responsive customer journey that still feels human."

Chloe T., Director of Digital Transformation · April 2026

Connects With

Works with your existing stack

Systems of Record Existing Data Warehouses

Setup complexity: Advanced

Sierra is an AI platform for customer support teams to build and manage sophisticated, conversational AI agents. It enables you to unify customer interactions across channels like chat, SMS, email, and voice, creating personalized experiences that boost customer lifetime value.

Who It's For

Why Customer Support & Experience choose this tool

🎯

Built for

Best for large organizations aiming to deploy a unified, omnichannel AI agent that provides personalized customer experiences at scale.

In-Depth Overview

For the CX leader tasked with scaling support without sacrificing quality, Sierra offers a compelling proposition. Its core is the Agent OS, which lets you build, optimize, and personalize AI agents for any channel. The standout feature, 'Ghostwriter,' builds a production-ready, multilingual agent directly from your existing SOPs, transcripts, and even whiteboard photos. This dramatically cuts down development time. Once deployed, Sierra doesn't just sit there. It provides an 'Insights Explorer' to analyze conversations and 'Experiments' to run multivariate tests, allowing you to continuously improve performance. The 'Agent Data Platform' gives your agent memory, enabling true personalization based on a customer's history and real-time context. Critically, Sierra operates on an 'outcome-based pricing' model. This aligns their success with yours, as you only pay for the value the agent delivers, moving the conversation from a cost center to a value driver. It's built for enterprises that want to unify their channels and empower their teams to deliver better experiences.

Key Use Cases

📈

Automate and Personalize Support at Scale

Head of Customer Experience

Use Ghostwriter to instantly build an AI agent from your existing support SOPs and conversation transcripts. Deploy it across email, chat, and voice to handle common queries 24/7.

Increased CSAT & Agent Productivity

✓ Pros

Outcome-based pricing ensures you only pay for value delivered.

Unifies all customer communication channels into a single agent.

Ghostwriter feature rapidly accelerates agent development from existing documents.

Strong focus on personalization with Agent Memory and data integration.

Built-in tools for continuous optimization, monitoring, and A/B testing.

· Cons

Pricing is not public, suggesting a significant investment tailored to enterprises.

May be overly complex for smaller teams or simpler use cases.

Requires a clear strategy and existing SOPs/data to leverage its full potential.

⚡ Editorial Verdict

Sierra is a powerful, enterprise-grade platform for building sophisticated CX agents. Its 'Ghostwriter' feature, which creates agents from documents, is a standout, and the focus on outcome-based pricing is compelling. However, its power comes with complexity; it's best suited for large teams with clear strategic goals, not for small businesses seeking a simple chatbot.

Questions & Answers

Frequently asked questions

How does Sierra build an AI agent? +

Sierra's 'Ghostwriter' feature builds a production-ready agent by ingesting your existing documents, such as SOPs, conversation transcripts, whiteboard photos, or even plain English descriptions of your goals.

What channels can Sierra's agents operate on? +

Sierra allows you to deploy a single, unified agent across a wide range of channels, including chat, SMS, WhatsApp, email, voice, and even ChatGPT.

How does Sierra handle pricing? +

Sierra uses an outcome-based pricing model. This means you pay for the value and results the AI agent delivers, rather than a flat subscription or per-seat fee. You must contact them for a specific quote.

Can Sierra's AI agent personalize conversations? +

Yes, through its Agent Data Platform, Sierra provides agents with 'memory'. It personalizes experiences for each customer based on real-time context, conversation history, and integrated data from your existing systems.

Is Sierra a good AI tool for a small business support team? +

While powerful, Sierra is designed for large-scale operations with complex needs. Smaller businesses might find it overly complex and may be better served by simpler, more out-of-the-box chatbot solutions.

How can I optimize my Sierra agent's performance? +

Sierra includes a suite of optimization tools. 'Insights Explorer' lets you analyze agent performance, 'Monitors' proactively flag conversations needing attention, and 'Experiments' allow you to run A/B tests to improve conversation design.

Last reviewed: Reviewed June 2026 — Assessed Ghostwriter agent creation, multichannel deployment, and personalization capabilities.

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