Decagon · decagon.ai · Named directly alongside Sierra as an alternative in the Adaptation AI independent analysis piece, framed as the primary head-to-head choice for buyers weighing Sierra against alternatives for enterprise AI customer service agents.[16]

Salesforce (Agentforce) · salesforce.com · Named in independent analyst coverage (GTMLens, TopReviewed) as the incumbent platform threat to Sierra — same enterprise buyer, same CX workflow, and a direct substitute for companies already on Salesforce Service Cloud.[18][19]

Intercom · intercom.com · Listed as a Sierra alternative in the CBInsights competitors page; same buyer (CX/support budget owner), same channel (chat), and same deflection-first use case.[17]

Zendesk · zendesk.com · Listed as a Sierra alternative in the CBInsights competitors page; same enterprise CX buyer and same support-ticket-resolution workflow that Sierra targets for displacement.[17]

The customer proof is company-sourced only. No independent source in this ledger confirms it.[13]

Ask for one referenceable production customer.

Not a recommendation. The first thing this ledger cannot answer.

Filled in the side panel for invited readers. This card carries sourced facts only.