Sierra

Sierra is a conversational AI platform that companies use to put customer facing agents into production across chat, SMS, WhatsApp, email, voice and ChatGPT. Instead of scripting dialogue flows by hand, teams describe the job they want done and the platform assembles an agent that follows company procedure, speaks the required languages and stays inside defined guardrails. The building layer is called Ghostwriter. It accepts standard operating procedures, call transcripts, whiteboard photos and audio recordings of subject matter experts, or simply a goal explained in plain English, and produces a working multichannel agent that reviewers can inspect before anything goes live. It auto generates simulations on every change, probes edge cases beyond the obvious scenarios, diagnoses failures and proposes the next fix for a human to approve. Agent Studio gives customer experience staff a no code surface for customer journeys, knowledge sources and brand guidelines. A separate insights layer covers what happens after launch. Explorer answers questions about conversations in natural language using deep research over transcripts, Monitors flag conversations that need extra attention, Experiments run multivariate tests on conversation design, and observability traces every tool call, knowledge lookup and latency figure. Results and a proposed next step can be delivered into Slack or Teams for the team to act on. Sierra is built for large consumer brands and enterprise customer experience organizations rather than small teams, and the company frames it as a way to grow customer lifetime value as well as to resolve service contacts. No pricing is published and there are no plans to compare. The company states that billing is outcome based, so customers pay for the value the agent delivers rather than for seats or conversations, and every quote is arranged through a demo request.