Yes, both OmniFocus and Todoist offer a Free Trial.
OmniFocus is designed for Large Enterprises, Medium Business and Small Business.
Todoist is designed for Large Enterprises, Medium Business and Small Business.
Pricing for OmniFocus Starts at $9.99/Month whereas for Todoist Starts at $4/Month when Billed Yearly.
Some top alternatives to OmniFocus includes Todoist, Wrike, Smartsheet, Asana, ProWorkflow, nTask, Taskworld, TickTick, Today, MeisterTask, ClickUp and StickyList.
Some top alternatives to Todoist includes Trello, Wrike, Smartsheet, Teamwork, nTask, Microsoft To Do, Remember The Milk, TickTick, Any.do, MeisterTask, ClickUp and TasksBoard.