Sierra is the best AI customer service agent platform for Fortune 500 brands, with outcome-based pricing and top voice quality. Decagon is best for teams that iterate fast, Wonderful for non-English markets, Intercom Fin inside an existing helpdesk, and SPIRITT when service must act across back-office systems.
The shortlist
Sierra
Outcome-based pricing, branded voice personas and long-horizon agents.
SPIRITT
Runs support agents and an AI phone line and also does the back-office work behind each ticket. Pick a dedicated CX platform for the deepest CX tooling.
Decagon
Plain-language operating procedures across voice, chat and email.
Wonderful
Localized agents in 35+ markets with on-the-ground teams.
Intercom Fin
High resolution rates without replacing your support stack.
Questions buyers ask
Sierra or Decagon?
Sierra suits Fortune 500 brands that want outcome-based pricing and premium voice. Decagon suits teams that want to change agent behavior themselves, often and fast.
Sierra or Wonderful?
Sierra is strongest in US and English-first enterprise CX. Wonderful is strongest across non-English markets with local deployment teams.
What is outcome-based pricing for AI agents?
You pay when the agent achieves an agreed result, like a resolved conversation or a saved cancellation, instead of per seat or per message. Sierra popularized it.