Yes, both Segment and Sherlock offer a Free Trial.
Segment is designed for Large Enterprises, Medium Business and Small Business.
Sherlock is designed for Medium Business and Small Business.
Pricing for Segment Starts at $120/Month whereas for Sherlock Starts at $129/Month.
Some top alternatives to Segment includes CustomerLabs CDP, BlueConic, Captain Metrics, Zylotech, Lexer, Acquia Marketing Cloud, BSI CDP, Gravito CDP and euromessage CDP.
Some top alternatives to Sherlock includes Productiv, Productlift, Amplitude Analytics, Closely, PredictLeads, Product Fit, Pioneer Launcher and Product Lead.