Sierra
NewHelps businesses build better, more human customer experiences with AI.
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
- Sierra ranks #49 of 80 in AI Agents with an AI visibility score of 1.5 (SlateIndex, Nov 3, 2026).
- Sierra is most visible on Google AI Mode (2.6) and least on Perplexity (0.9).
- AI engines name Sierra in 2 of the 30 AI Agents buyer prompts SlateIndex tracks.
- amazon.com is the source AI engines cite most in answers about Sierra, with 3 citations.
About
Company details for 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. It ranks #49 of 80 in AI Agents on SlateIndex and has a visibility score of 1.5 in the latest weekly run.
Founded in 2024 and headquartered in San Francisco, California, United States, the company employs 1,001–5,000 people. Its differentiator: outcome-based pricing, so the customer pays only for value the agent delivers.
- Website
- sierra.ai
- Categories
- AI Agents
- Company size
- 1,001–5,000 employees
- Headquarters
- San Francisco, California, United States
- Founded
- 2024
- Company type
- Private, venture-backed
- Funding
- Series E, led by Tiger Global and GV
- Deployment
- Managed and forward-deployed, with no self-serve option.
- Platforms
- Chat, SMS, WhatsApp, Email, Voice, ChatGPT
Read from linkedin.com, techcrunch.com, ai.g2.com, sierra.ai, cnbc.com, siliconvalleyinvestclub.com · refreshed Nov 3, 2026.
AI visibility
Latest weekly run · Nov 3 · next run Nov 9
Visibility score trend
Weekly runs over the last 60 days, with up to 7 competitors. Click a name to hide or show its line.
Changes appear after the second weekly run in AI Agents. Microsoft Copilot Studio leads the category at 33.3%.
Media
Website and product screenshots for Sierra
AI mentions & citations
Recent answers that name Sierra
Products & features
What Sierra sells
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.
Target market & buyers
Large businesses running customer experiences at scale.
Notable customers include Rocket Mortgage, Singtel, Airtable, SoFi, CarMax, Redfin, Chime, Paychex.
| Industry | Primary use case |
|---|---|
| Banking and fintech | Customer support for banking and personal finance, including Chime and SoFi. |
| Mortgage and real estate | Guiding customers through the home-buying journey and real estate search, including Rocket Mortgage and Redfin. |
| Retail and automotive | Inbound sales calls and online customer experience, including CarMax. |
| Airlines | AI voice agent for callers in multiple languages, including Philippine Airlines. |
| Healthcare | Scaling chronic care and patient contact, including Sutter Health. |
| Utilities | Utility customer service agents, including Kraken. |
| Media and entertainment | Listener and subscriber loyalty, including SiriusXM. |
Funding & recent developments
Funding
| Round | Year | Amount |
|---|---|---|
| Funding round led by Sequoia and Benchmark | 2024 | $110M |
| Funding round led by Greenoaks | 2024 | $175M |
| Funding round led by Greenoaks Capital | 2025 | $350M |
| Series E, led by Tiger Global and GV | 2026 | $950M |
| Latest known round | Total raised |
|---|---|
| Series E, led by Tiger Global and GV | — |
Recent developments
- Oct 2026PartnershipPartnership with Stripe for card payments during phone calls
Sierra partnered with Stripe to let agents take card payments during phone calls.
- May 2026FundingSeries E funding round
Raised $950M at about $15.8B post-money, led by Tiger Global and GV, with Benchmark, Sequoia and Greenoaks participating.
- Apr 2026CompanyAcquisition of Fragment
Acquired French startup Fragment, its third acquisition of 2026.
- Apr 2026ProductLaunch of Ghostwriter
Launched Ghostwriter, an agent that builds and deploys other agents from plain-language requests.
- Mar 2026CompanyAcquisitions of Opera Tech and Receptive AI
Acquired Japan-based Opera Tech and voice-agent company Receptive AI.
Competitive landscape
How Sierra compares with its top three alternatives
Sierra most often appears alongside Claude, Salesforce, Intercom in AI answers.
| Brand | Visibility | Share of voice | vs last week | Starting price |
|---|---|---|---|---|
| Sierra | 1.5% | 0.5% | New | Pricing not available |
| Claude | 47.5% | 11% | New | Pricing not available |
| Salesforce | 46.2% | 9.6% | New | Pricing not available |
| Intercom | 46.2% | 10.1% | up+2% | $29 / seat / mo |
| AWS | 35.7% | 7.5% | New | Pricing not available |
Cite as: SlateIndex, “Sierra AI visibility profile”, https://slateindex.ai/brand/sierra, data of Nov 3, 2026. Licence: CC BY 4.0.