Yes, both Slack and Smartchat offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Smartchat is designed for Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Smartchat Starts at $49/Month.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to Smartchat includes ZoomInfo Chat, LiveAgent, LiveChat, Crisp, LiveEngage, DeskMoz, Lime Talk, WebsiteAlive, ChatFlow247 and Let's Connect.