Yes, both Slack and Sprintful offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Sprintful is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Sprintful Starts at $9/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 Sprintful includes Appointy, Setmore, Calendly, Cogsworth, Book Like A Boss, Doodle, EasyCalendar, ClickBook, Schedule.cc by 500apps, DaySchedule, Appointmind, i-Scheduling for Appointments and Calendar.
