Yes, both Contact At Once and LiveAgent offer a Free Trial.
Contact At Once is designed for Medium Business and Small Business.
LiveAgent is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Contact At Once Starts at $1,100/Month whereas for LiveAgent Starts at $15/User/Month.
Some top alternatives to Contact At Once includes ZoomInfo Chat, LiveAgent, LiveChat, Crisp, LiveEngage, MyLiveChat, Smartchat, raychat, LinkedChat, ChatFlow247 and Let's Connect.
Some top alternatives to LiveAgent includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Freshservice, Freshdesk, ClickDesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, Help Scout, LabiDesk, LiveChat, Zendesk Chat, LiveHelpNow and Little SaaS Communication.