# Sierra

> Platform for building customer-facing agents handling service and sales conversations across chat, voice and messaging

Source: https://dontaskagain.com/sierra
Website: https://sierra.ai/?utm_source=dontaskagain
Pricing: Paid
Categories: [Customer support](https://dontaskagain.com/categories/customer-support.md), [Voice agents](https://dontaskagain.com/categories/voice-agents.md)
Listed: 2026-10-26
Updated: 2026-10-26

Sierra is a conversational AI platform that businesses use to deploy customer-facing agents. A single agent handles conversations across chat, SMS, WhatsApp, email, voice and ChatGPT, resolving service requests and supporting revenue-generating interactions on the company's behalf.

**Key features:**

- Ghostwriter builds agents from SOPs, transcripts, whiteboard photos, audio recordings or a plain-English goal.
- Multilingual, multichannel agents with built-in guardrails.
- Automated agent updates based on flagged issues.
- Explorer for deep-research-style analysis of conversations.
- Proactive conversation monitoring and multivariate experiments.
- Traces of every tool call and knowledge lookup.

Sierra is aimed at large consumer brands and enterprises with high customer service volumes, and teams can build agents with or without engineering support. It uses outcome-based pricing, so companies pay for completed results. Access is arranged through the Sierra team rather than self-serve signup.

## More customer support agents

- [Fin](https://dontaskagain.com/fin.md): Customer service agent from Intercom that resolves queries, processes refunds and updates accounts across channels
- [Decagon](https://dontaskagain.com/decagon.md): Customer service agents for enterprises that resolve requests across chat, voice and email
- [Ada](https://dontaskagain.com/ada.md): Enterprise customer service agents that resolve and act on inquiries across voice, chat, email and messaging
- [Gorgias](https://dontaskagain.com/gorgias.md): Ecommerce helpdesk with an AI agent that resolves tickets, applies discounts and upsells across channels
- [PolyAI](https://dontaskagain.com/polyai.md): Enterprise dialog agents that resolve customer calls and chats end to end, built in Dialog Studio or via API
- [Rep AI](https://dontaskagain.com/rep-ai.md): Ecommerce agent that spots shopper intent, starts sales chats and resolves support across chat, email and social
- [EliseAI](https://dontaskagain.com/eliseai.md): AI assistant for property managers and healthcare providers that handles calls, texts, emails and chat around the clock
- [Voiceflow](https://dontaskagain.com/voiceflow.md): Platform for designing, building and deploying customer service AI agents across chat, messaging and voice