Sierra

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.

Best forLarge enterprises unifying omnichannel support.

DifferentiatorBuilds agents from documents; outcome-based pricing.

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

Explore Sierra

Pricing on request

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

OmnichannelAI Agent BuilderPersonalizationAnalyticsOutcome-Based Pricing

📊 Independently tested and scored. How we score →

✍️ Reviewed by Zekai Editorial Team · Updated August 6, 2026

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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

Build with Ghostwriter

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

Deploy Omnichannel

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

Optimize and Personalize

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

Ready to automate your workflow with Sierra?

Explore Sierra →

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

Prompt Templates

Try it with these prompts

Copy any prompt and paste it directly into the tool.

Build a customer service agent

Build a customer service agent that can handle inquiries about product returns and exchanges. It should be able to access order history and provide return shipping labels. Ensure it follows our company's return policy gu…

Optimize agent performance

Optimize the agent's performance by analyzing recent conversation logs for common issues. Identify patterns in customer frustration and suggest improvements to the agent's responses or workflows. Focus on reducing resolu…

Create proactive engagement workflows

Create a proactive engagement workflow for customers who have abandoned their shopping carts. Trigger a personalized message via SMS or email offering assistance or a discount. This workflow should be initiated by a spec…

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

See Plans & Pricing →

Connects With

Works with your existing stack

Systems of Record Existing Data Warehouses

Setup complexity: Advanced

Comparison

How it compares

Compared to platforms like Intercom or Zendesk which focus on augmenting human teams within their ecosystem, Sierra is built to create a powerful, standalone AI agent that acts as a central brain across all channels. Choose Sierra when your goal is to build a sophisticated, unified, and highly personalized AI-first experience at enterprise scale. Opt for an alternative if you primarily want to add AI features to an existing human-led support workflow within a single platform.

You require straightforward, public pricing tiers.

Your needs are simple and can be met by a less complex chatbot builder.

You need a tool that primarily augments human agents rather than creating a standalone one.

The decision

Is it worth it?

Return on investment

With its outcome-based pricing model, ROI is directly tied to performance, meaning costs are aligned with measurable improvements in CX metrics.

Built for

Customer Experience (CX) leaders, Heads of Support, and Product Managers in mid-to-large enterprises looking to scale support operations with AI.

Effort to adopt

Advanced

Compliance

Compliance posture not publicly documented — verify with vendor.

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.

See all Customer Support & Experience AI tools → Browse the AI Directory →

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

Plans & Pricing

Start today

Pro

Pricing on request

Sierra uses an outcome-based pricing model, ensuring you only pay for the value delivered. A demo is required to receive a quote.

Start Pro Plan

Prices and features are updated regularly but can change at any time — always confirm on the official website. Some links on this page are affiliate links.

Customer Support & Experience

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Sierra Alternatives (2026)

The best alternatives to Sierra — every tool below is tested and scored by Zekai.

Compare	Sierra	HeyDeacon	DeepL
Zekai Score	9.2/10	9.4/10	9.3/10
Rating	4.6/5	4.7/5	4.7/5
Pricing	Pricing on request	$149/mo	$26.00/mo
Free tier	No	Yes	Yes
Best for	Best for large organizations aiming to deploy a un…	Scaling customer support and user onboarding for s…	Delivering fast, accurate, and secure multilingual…

HeyDeacon DeepL Open.cx CoSupport AI Signals Delighted Observe.ai LimeChat

Free guide

Take it with you

Getting Started with Sierra: From SOP to Live Agent

**Define Your Goal:** What is the primary job for your first agent? (e.g., answer top 20 FAQs, book appointments, track orders).
**Gather Your Knowledge:** Collect all relevant SOPs, past conversation transcripts, help docs, and process notes.
**Choose Your Channels:** Decide where your agent will live first (e.g., website chat, SMS, email).

**Understand Outcome-Based Pricing:** Prepare to define what success looks like (e.g., deflection rate, successful resolutions) to align with Sierra's model.
**Prepare for Optimization:** Realize that launch is just the beginning. Plan to use Sierra's analytics to continuously improve.

+3 more steps inside the guide

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Disclaimer

Zekai is an independent AI tools directory. We are not affiliated with, endorsed by, or officially connected to Sierra unless clearly stated. All product names, logos, and brands are the property of their respective owners and are used for identification purposes only. The information on this page — including pricing, features, and availability — is general information, may have changed since our last review, and is not professional advice. Zekai Scores and verdicts are our editorial opinion. Some outbound links are affiliate links that may earn us a commission at no extra cost to you. Spotted outdated or incorrect information? Request a correction →

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Sierra

Top AI for Customer Support & Experience picks

Your workflow, automated

Before & After

Try it with these prompts

Trusted by professionals

Works with your existing stack

How it compares

Is it worth it?