Share
What is Sierra?
Sierra is an AI tool (by Sierra) that lets large companies build conversational agents to serve customers, complete full transactions and drive revenue. According to the company, 40% of the Fortune 50 work with it across banking, telecom, healthcare, travel and retail.
How do you build an agent with Sierra?
With Ghostwriter, the agent-building agent, you upload SOPs, transcripts, whiteboard photos or audio recordings, or describe the goal in plain English. The result is a multichannel, multilingual agent with built-in guardrails. Technical teams also get Agent Studio, and every change the platform suggests can be reviewed and validated before it ships.
One agent runs across chat, SMS, WhatsApp, email, voice and ChatGPT in 59 languages, and connects to systems such as CRM or order management to handle returns, insurance claims or mortgages.
Which tools help improve the agents?
- Explorer: deep-research style analysis of conversations, with recommendations.
- Monitors that flag conversations needing attention.
- Multivariate experiments to optimize conversation design.
- Observability of every action: tool calls, knowledge lookups and latency.
- Horizon: long-horizon planning, customer memory and proactive actions.
Sierra pros and cons
It stands out for handling complex use cases at scale and for a model where companies pay when the agent achieves specific results, backed by an expert team that supports each deployment. On the downside, it targets large companies, is not a self-serve product for small businesses and access goes through sales.
Sierra features and use cases
How to use Sierra
Sierra FAQ
What is Sierra?
Sierra is a conversational AI platform that builds customer service agents for large companies across channels and languages.
Is Sierra free?
No, it is an enterprise service with outcome-based pricing. See the pricing section to learn how it works.
What does outcome-based pricing mean?
The company pays when the agent achieves specific, valuable outcomes agreed in advance, rather than paying for licenses.
Does it have an API?
Its site does not detail a public self-serve API; agents connect securely to your systems and technical teams work with Agent Studio.
Does it work in Spanish?
Yes, agents serve customers in 59 languages, and the official site is also available in Spanish.
What is Ghostwriter?
It is the agent-building agent: from documents, audio or a description, it creates a production-ready agent with guardrails.
Which channels does it work on?
Chat, SMS, WhatsApp, email, voice and ChatGPT, with one agent for all of them.
Is it a good fit for small businesses?
It is aimed at large companies with complex, high-volume use cases; a small business usually fits better with self-serve tools.
What are the alternatives to Sierra?
In the directory you can compare it with Decagon, Fin by Intercom or Zendesk AI Agents, which also focus on customer service agents.
Sierra pricing and plans
Information from the official site (Checked on: 05/11/2026). Sierra does not publish amounts in USD or any other currency: it uses outcome-based pricing, where you pay only when the agent achieves specific agreed outcomes. Terms are negotiated with its sales team.
Sierra Screenshots
Sierra user reviews
Write a review
Checking your session...
Sierra Reviews
Loading reviews...
Sierra alternatives
Help Scout
Help Scout is a customer support platform with a shared inbox, knowledge base and an AI agent that resolves requests on its own.
