Intercom Fin

The support bot I'd try first. You pay per resolved chat, which keeps it honest.

If Intercom Fin isn't right

Zendesk AI in customer support
Sensible add-on if your helpdesk already lives in Zendesk.
Paid plans; see site
Siena in customer support
Agent of Record platform for consumer brands — support, shopping and social agents sharing one customer memory. Proven on high-volume ecommerce CX more than DIY SMB chat widgets.
Outcome/intelligence-based pricing (book a demo; no per-seat helpdesk fee)
Freshdesk in customer support
Value helpdesk with Freddy AI; strong India/APAC support.
Free tier; paid plans available
Actually Asked in customer support
A self-improving FAQ that matches your site’s fonts and colours instead of dropping a chat bubble. Best for Shopify and marketing sites where the same pre-purchase questions keep landing in email.
Free (50 AI answers/mo on one site); paid plans by answer volume and sites