Yes, both Slack and Kalo offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Kalo is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Kalo Starts at $149/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 Kalo includes ReclaimAI, ZoomInfo InboxAI, Anywhere, 8Demand, GrowCRM, StudioCloud, Harlow, Qualified, Klutch, Workvivo, Fiverr Workspace, Shortlist, OfficeFiles and Betterlance.