Yes, both Google Chat and Slack offer a Free Trial.
Google Chat is designed for Large Enterprises, Medium Business and Small Business.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Google Chat Starts at $6/User/Month whereas for Slack Starts at $2.67/Month.
Some top alternatives to Google Chat includes Microsoft Teams, Slack, Glip, MeetSpace, Output Messenger, ChatWork, Trillian, Dialog, Office Chat and Teamwork Chat.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.