Sierra review

Sierra has the broadest capability set in this list, aimed at retail and consumer brands with enterprise budgets. Its retail page describes three jobs: personalized product guidance before purchase, order management covering tracking, warranty claims, refunds and converting returns to exchanges, and account management for billing details, subscriptions and cancellations, with chances to upsell or retain. The same agent can run on chat, SMS, WhatsApp, email, voice and ChatGPT. Ghostwriter builds an agent from SOPs, transcripts or a plain English goal, and Sierra adds experiments, monitors and observability on every tool call. Sierra names Sonos, Casper and Wilson as retail customers. The reasons it ranks lower here are access and cost transparency: there is no self-serve plan, pricing is outcome-based and only available from sales, and the rollout fits a brand with a dedicated CX operations team rather than a store owner looking for something to switch on this week.

Who it is for

Large retail and consumer brands that want a custom-built agent across every channel and outcome-based contracts.

Price

See vendor pricing (USD check pending).

US price check pending. See the vendor pricing page.

Key features

• Retail agents for product recommendations, order management and account management
• Ghostwriter builds an agent from SOPs, transcripts or plain English
• Voice agent that handles interruptions and detects sentiment
• Experiments, monitors and observability for every agent action
• Outcome-based pricing

Strengths and weaknesses

• Strength: One agent across chat, SMS, WhatsApp, email, voice and ChatGPT
• Strength: Can convert returns to exchanges and act on upsell or retention chances
• Strength: Customer stories include Sonos, Casper and Wilson
• Weakness: No public pricing
• Weakness: Sales-led enterprise rollout
• Weakness: More than most independent stores need

Key facts

• Pricing model: Outcome-based, no public rates
• Channels: Chat, SMS, WhatsApp, email, voice, ChatGPT
• Retail customers named: Sonos, Casper, Wilson
• Builder: Ghostwriter agent-building agent

Where it ranks

Sierra is No. 7 in our Best AI Agents for Ecommerce verdict.