Sierra by Sierra
Overview
Platform for building and running branded AI agents for enterprise customer service over chat, SMS, WhatsApp, email and voice. It includes Ghostwriter (an agent that builds and optimizes other agents), Agent Studio and Insights, and it is sold with outcome-based pricing.
Recent developments
- 2026-05: raised a $950M Series E led by Tiger Global and GV at a reported $15.8B valuation (press reports)
- 2026-03-25: launched Ghostwriter, an agent that creates and optimizes other agents
Sierra usage and attention over time
Download the raw daily series: sierra.csv
Key facts
| Maker | Sierra |
|---|---|
| Type | Enterprise customer service AI agent platform |
| License | Proprietary |
| Channels | chat, SMS, WhatsApp, email, voice |
| Works with | Standalone platform deployed with each customer's own back-end systems; no help desk list on its homepage |
Pricing
No public price list: sierra.ai has no pricing page and the site only says pricing is outcome-based, so customers pay for results rather than seats. Pricing must be requested from sales.
, checked Oct 5, 2026. Prices change often; confirm before you buy.
Pulse Score breakdown
Each component is scored 0 to 100 from public signals; a dash means no data for it. Methodology.
Reliability
From the vendor's public status page
0 incidents reported in the last 30 days.
Sierra alternatives
| # | Agent | Pulse | Downloads 7d | 7d | 30d | VS Code installs | Stars | Latest release | Price | Last 90 days | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 22 |
RasaRasa |
57 | 75K | up 26.4% | 0.0% | — | 21.3K+2/day | 3.6.2121mo ago | Free | ||
| 35 |
Chatwoot CaptainChatwoot |
52 | — | — | — | — | 37.6K+42/day | 4.18.018d ago | Free + $19/mo | ||
| 55 |
BotpressBotpress |
44 | 25.6K | down 15.0% | — | — | 14.9K+2/day | 12.30.93y ago | Free + $150/mo | ||
| 59 |
ForethoughtForethought (a Zendesk company) |
42 | — | — | — | — | — | — | Custom | — | |
| 60 |
DecagonDecagon |
42 | — | — | — | — | — | — | Custom | ||
| 68 |
ChatbaseChatbase |
40 | 233 | down 22.1% | — | — | — | — | Free + $40/mo | ||
| No agents match that filter. | |||||||||||
Head to head: Sierra vs Fin
Sierra FAQ
How much does Sierra cost?
No public price list: sierra.ai has no pricing page and the site only says pricing is outcome-based, so customers pay for results rather than seats. Pricing must be requested from sales.
Is Sierra open source?
No. Sierra is a proprietary product from Sierra.
What are the alternatives to Sierra?
The closest alternatives in the same category by Pulse Score are Rasa, Chatwoot Captain, Botpress, Forethought.
Where these numbers come from
Site rank: sierra.ai on the Tranco list. See data sources for how each one is collected.
Product facts and pricing were checked against: sierra.ai, docs.sierra.ai, status.sierra.ai, g2.com, trendingtopics.eu, en.wikipedia.org.