Coworker vs. guest
Coworkers are Tallyfy users that can log into a Tallyfy account. Coworkers are billed in paid plans.
Coworkers can create one-off tasks, create templates, view templates, start processes and also invite other users.
More about how to invite coworkers can be found here.
Guests are FREE users outside your organization.
The guest user feature is designed for transient clients/customers/workers that are assigned to occasional tasks in a specific process. Only one guest email can by assigned to a task.
Guests can only see a task that is assigned to their email address via a unique url. They do not have to log into Tallyfy to view the task.
Guests cannot create one-off tasks, create templates, view templates, start processes or invite other users. Their functionality is limited to just single tasks and completing them.
More about what guests can do can be found here.