Sierra

What is Sierra?

Sierra is a platform for building and running AI agents that handle customer conversations for a brand. A single agent can be deployed across voice, chat, SMS, WhatsApp, email and ChatGPT, in 59 languages, and connected to systems of record such as order management and CRM so it can finish tasks like returns, claims or mortgage applications. Teams build agents in Agent Studio without code, using journeys, knowledge sources and 40+ pre-built integrations, and Ghostwriter can generate an agent from SOPs, transcripts or a plain-English goal. Simulations, monitors, experiments and observability tools help test and improve agents. Sierra uses outcome-based pricing, so you pay when an agent achieves an agreed result such as a resolved conversation or a saved cancellation; specific prices are not published.

Use cases

• Resolve customer support conversations
• Answer customer phone calls with a voice agent
• Reply to customer emails automatically
• Process returns and claims
• Suggest responses to human care agents
• Test agents with simulated conversations

Who it's for

• Customer experience teams
• Contact center leaders
• Enterprise brands
• Operations teams

Why use Sierra

• Outcome-based pricing ties charges to results such as resolved conversations rather than seats.
• One agent can serve several channels, so customers get consistent answers on voice, chat and email.
• Built-in testing, monitoring and traces show why an agent made each decision.
• Teams without engineers can build and update agents in Agent Studio.

Sierra features

• Agent Studio for no-code agent building
• Ghostwriter that builds agents from SOPs, transcripts and audio
• Journeys with step-by-step instructions and guardrails
• 40+ pre-built integrations and a custom integration framework
• Voice, messaging, email and Live Assist channels
• Publishing of an agent to ChatGPT
• Simulations and regression testing
• Explorer, Monitors, Experiments and Observability
• Knowledge gap detection and drafted knowledge articles
• Brand name, voice and look customization

Sierra integrations

• WhatsApp
• Apple Business Chat
• ChatGPT

How to get started with Sierra

1. Describe your goal or upload SOPs, transcripts and recordings so Ghostwriter drafts an agent.
2. Refine journeys, connect knowledge sources and link systems such as CRM and order management.
3. Test the agent with simulated conversations and regression suites before release.
4. Deploy across voice, chat, email and messaging, then use monitors and experiments to keep improving it.

Sierra limitations

• Specific prices are not published
• Outcome criteria are agreed per agent, and a blended model may be used for some interactions

Sierra pricing

Sierra is sold on custom quotes, so its prices aren't published.

Prices can change and may vary by country or exclude tax. Check the official pricing page.

Sierra alternatives

The main Sierra alternatives listed on Debuly are Quiq, Open, DRING, Fin, Synthflow and Bland. The table compares pricing and platforms; order is A–Z.

1. 

   Bland

   Voice AI platform for building phone agents that take inbound and outbound calls, with per-minute pricing that includes the LLM, speech and voices.

   Automation and agentsAudio and voiceDeveloper platforms
   FreemiumVisit Bland (official site)
2. 

   DRING

   AI agents that answer and make calls, and reply on WhatsApp, web chat and email, with a shared inbox for handover.

   Automation and agentsChat assistantsAudio and voice
   Contact salesVisit DRING (official site)
3. Fi

   Fin

   AI customer service agent that answers support conversations across channels and is billed per resolved outcome.

   Automation and agentsChat assistants
   Free trialVisit Fin (official site)
4. 

   Open

   AI customer support platform with voice, chat, email and WhatsApp agents, billed per resolved ticket.

   Automation and agentsChat assistantsAudio and voice
   PaidVisit Open (official site)
5. 

   Quiq

   Enterprise AI agent platform for customer service that resolves requests across voice, chat, SMS and email with guardrails and audit trails.

   Automation and agentsChat assistants
   Contact salesVisit Quiq (official site)
6. 

   Synthflow

   Voice AI platform for building and running AI phone agents that answer and handle inbound and outbound business calls.

   Automation and agentsAudio and voiceProductivity
   Contact salesVisit Synthflow (official site)

Sierra FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from sierra.ai · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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