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Sierra

Branded customer agent for chat, messaging, email, voice, and ChatGPT.

Details checkedReviewed 2026-09-28

Is it a fit?

Best for

Large brands that want one configured agent across several customer channels.

Think twice if

A small team that needs a published monthly price and same-day self-serve setup.

What it can help you do

Answer customer questions from your knowledge base

Sierra's homepage describes a production agent that handles customer conversations and actions across chat, SMS, WhatsApp, email, voice, and ChatGPT.

Prepare: SOPs, transcripts, photos, audio, or a plain-English goal · Customer context from connected systems
Get: Customer conversations across channels · Agent actions and next-step workflows · Performance insights and experiment results
Your part: Share procedures and brand rules · Review agent changes before shipping · Talk to Sierra to buy

Answer customer questions →

Where you still take over

  • Share procedures and brand rules
  • Review agent changes before shipping
  • Talk to Sierra to buy

Limits to know

  • No self-serve price on the fetched homepage
  • Setup is a build, not an instant upload
  • Guardrails and review are part of the stated workflow
  • Public case-study quotes are vendor-published

From input to output

What you provide

  • SOPs, transcripts, photos, audio, or a plain-English goal
  • Customer context from connected systems

What you get

  • Customer conversations across channels
  • Agent actions and next-step workflows
  • Performance insights and experiment results

How to start

Have these ready

  • Sales conversation with Sierra
  • Company procedures and customer systems
  • Channel access for chat, email, voice, or messaging
  1. Request a conversation from the site.
  2. Provide SOPs or explain the goal so Ghostwriter can build an agent.
  3. Review tests and guardrails.
  4. Deploy the agent on the chosen channels.
  5. Use Insights to inspect and update behavior.

Pricing, with context

Quote-based, outcome-oriented enterprise pricing. No self-serve plan amount or free trial was established.

Usage caps, taxes, regional availability and plan features may change. Confirm the current terms before subscribing.

Check official pricing

Pricing category: Paid · 2026-09-28

Evidence & sources

This is an official-source review, not a hands-on test of Sierra. Vendor descriptions and demos are evidence of advertised features, not independent proof of results. “Best for” and review guidance are editorial judgments based on those sources.
  • Sierra homepage ↗https://sierra.ai/

    Page describes Ghostwriter building a multichannel agent from SOPs or plain English, outcome-based pricing, and tools to inspect and optimize conversations.

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Compare their inputs, outputs and setup requirements before choosing.