Yes, both Slack and Sherlock offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Sherlock is designed for Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Sherlock Starts at $129/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 Sherlock includes Productiv, Productlift, Amplitude Analytics, Closely, PredictLeads, Product Fit, Pioneer Launcher and Product Lead.