Sierra
Agent43Agent Readiness: 43/100. Above median. Measured by StartupHub.ai. Median 41.Trust94Data Trust: 94/100. Top 25%. Measured by StartupHub.ai. Median 61.Sierra builds AI agents that help leading brands deliver better customer experiences by increasing customer lifetime value and personalizing interactions across multiple channels.
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About
Sierra is a conversational AI platform designed for enterprise customer service. It enables companies to deploy branded AI agents that handle real-time queries, automate workflows, and execute actions such as updating CRM records or managing orders. The platform focuses on building AI agents that mirror brand voice, safeguard compliance and privacy, and integrate with enterprise systems for always-on support, aiming to move beyond basic chatbots by leveraging a multi-model architecture, guardrails, and supervision layers to reduce the risk of 'hallucinations' and ensure reliable, high-quality interactions at scale.
Listed competitors
Voiceflow is a stronger alternative for teams that want to own and iterate on the AI agent themselves, with voice and IVR as a day-one strength. Sierra is more suitable when a vendor is preferred to build and operate the agent.
Sierra focuses narrowly on autonomous agents as a quick fix for customer support, while Assembled connects AI to the entire support operation, providing full visibility across human agents, AI, and BPO partners for a human-in-the-loop approach.
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Key facts
- Website
- sierra.ai
- Headquarters
- San Francisco, United States
- Founded
- 2023
- Employees
- 900
- Total funding
- $1.9B (Growth)
- Business model
- B2B
Funding rounds
| Date | Round | Amount | Post-money | Lead investors |
|---|---|---|---|---|
| 1 Dec 2024 | Funding Round | $175M | $4.5B | |
| 21 May 2024 | Undisclosed round | $110M | Sequoia Capital, Benchmark |
Tech stack
Detected on sierra.ai, last scanned 20 Oct 2026. Run your own scan
- Compliance
- SOC 2, HIPAA, ISO 27001, PCI DSS, GDPR, FedRAMP
- Frontend
- Next.js, Tailwind CSS
- Auth
- Okta
- Observability
- incident.io
- Support
- HubSpot
- AI customer support
- Sierra
- CMS / Builders
- Ghost
- CDN
- Cloudflare, Vercel
- Email provider
- Google Workspace
- Affiliate program
- Self-hosted affiliate
Sierra scores 76. Does yours?
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4 reviews from Reddit gathered in one place
Anyone at Sierra.ai?. Curious what the culture is like here? Are people selling and make money? Positive customer feedback on the product? Etc etc
Can anyone share public docs for Sierra AI or Decagon?. I'm exploring AI platforms Sierra and Decagon and for the life of me can't seem to find a single demo of their platforms or even public docs - am I missing something?
Can anyone share Sierra AI or Decagon docs?. I'm exploring AI platforms Sierra and Decagon and for the life of me can't seem to find a single demo of their platforms or even public docs - am I missing something?
How much does Sierra AI cost?. Hi all, looking to move from Intercom to something with more firepower. Looking for info on Sierra AI and how much it costs. Intercom is priced per AI resolution and while it's not ideal (bills fluctuate quite…
Each quote is copied word for word and links to where it was posted. Promotion and off-topic posts are filtered out.
Frequently asked
Is Sierra trustworthy and reputable?
StartupHub's Data Trust & Reputation score for Sierra is 94 out of 100, a trusted rating, based on site security posture, privacy practices, malware and phishing checks, and public reputation signals.
How much funding has Sierra raised?
Sierra has raised a total of $1.9B in funding. The most recent round on record is Growth.
How many employees does Sierra have?
Sierra has approximately 900 people on record.
Does Sierra have an affiliate program?
Yes, Sierra has an affiliate program. The program runs on Self-hosted affiliate. Register here: sierra.ai/affiliates
Public record
SEC filings, insider activity, nonprofit links and pay benchmarks for Sierra
