ClickUp offers Free Trial, but Slash does not.
Slash is designed for Individuals, Medium Business and Small Business.
ClickUp is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Slash Starts at $5/Month when Billed Yearly whereas for ClickUp Starts at $7/User/Month when yearly.
Some top alternatives to Slash includes Todoist, Wrike, Smartsheet, nTask, Microsoft To Do, TickTick, Today, ClickUp, WeekToDo, SimplyDone, TasksBoard, Toodledo and Taskable.
Some top alternatives to ClickUp includes Basecamp, Trello, TeamGantt, Asana, Teamwork, ProjectManager.com, ProWorkflow, nTask, Todoist and Height.