Yes, both HourStack and TimeCamp offer a Free Trial.
HourStack is designed for Medium Business and Small Business.
TimeCamp is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for HourStack Starts at $9/Month when Billed Yearly whereas for TimeCamp Starts at $6.30/User/Month when Billed Yearly.
Some top alternatives to HourStack includes TimeCamp, TrackingTime, TimeTrack, Busy, Timebase, TeamTime, Sunsama, Tack, Timet and TimeTackle.
Some top alternatives to TimeCamp includes clockodo, Time Doctor, Toggl Track, Harvest, TrackingTime, Clockify, Tick, TimeTrack, Timesheet and Clockly by 500apps.