# Sierra

Sierra is a conversational AI platform that businesses use to build and run customer service agents across chat, SMS, WhatsApp, email, voice and ChatGPT. Ghostwriter builds and changes agents from plain-language descriptions, uploaded SOPs and transcripts, and Insights provides analytics, experimentation and observability for agent performance. The company is headquartered in San Francisco and was co-founded by Bret Taylor and Clay Bavor.

Page: https://slateindex.ai/brand/sierra · data of 2026-11-03

## Facts

- Founded: 2024
- Headquarters: San Francisco, California, United States
- Employees: 1,001–5,000
- Company type: Private, venture-backed
- Latest funding: Series E, led by Tiger Global and GV
- Deployment: Managed and forward-deployed, with no self-serve option.
- Best for: Businesses that want customer service AI agents across chat and voice, built by customer experience teams with or without engineering support.

## Products

- Ghostwriter: Builds and modifies AI agents from plain-language descriptions, uploaded SOPs and transcripts, with simulation testing before release.
- Agent Studio: Lets customer experience teams build and manage agents without writing code, including journeys, knowledge and brand guidelines.
- Explorer: Answers natural-language questions about agent performance using analytics and sample customer conversations.
- Insights: Reporting, experimentation and observability for measuring and improving agent performance.
- Horizon: Long-horizon planning that breaks complex outcomes into steps that improve over days or months.

## Rankings

| Category | Rank | Visibility | Mentions |
|---|---|---|---|
| AI Agents | 49 of 80 | 1.5 | 3 |

## By engine

| Engine | Visibility | Mention rate |
|---|---|---|
| chatgpt | 0.9 | 3.7% |
| google_ai_mode | 2.6 | 3.7% |
| perplexity | 0.9 | 3.7% |

## Definitions

- Visibility (0–100): how often and how high AI answers name the brand, weighted by position.
- Mention rate: share of collected AI answers that name the brand.
- Share of voice: the brand's mentions as a share of all brand mentions in the category.
- Citation authority: share of answers naming the brand that cite the brand's own site.

Cite as: SlateIndex, “Sierra AI visibility profile”, https://slateindex.ai/brand/sierra, data of 2026-11-03. Licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).