Smartsheet offers Free Trial, but Nexttask does not.
Nexttask is designed for and undefined.
Smartsheet is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Nexttask Starts at $5/User/Month whereas for Smartsheet Starts at $9/month when yearly.
Some top alternatives to Nexttask includes Todoist, Wrike, Smartsheet, Teamwork, ProWorkflow, SwiftKanban, Kanbanize, Flowist, ClickUp, Kanban Tool, Flow, KanbanFlow and Taskiem.
Some top alternatives to Smartsheet includes monday.com, Quickbase , ClickUp, Zoho Projects, Jira, Microsoft PPM, Trello, TeamGantt, Asana, Teamwork, ProjectManager.com, Microsoft Project and Airtable.