What is the simplest organizer to use for one-step tasks in a small team?

Question

Task Management

We have: 2 dispatchers in the office and 5 employees in the fields. It is necessary to make it so that dispatchers can set simple tasks for employees, and employees would see them as push notifications on their phones and perform them. The tasks are simple, such as "Call Andrey 89031234567 about the product", deadline, responsible. It is desirable that the dispatcher does this from the web interface, and the agents use phones. And so that the task was marked as completed! That is, e-mail is not suitable. Separation by rights is needed - so that the performers do not see each other's tasks. No categories of tasks, projects, priorities and other things are needed, as simple as possible.

Answer 1

Google Docs Spreadsheets as an option with push notifications to the slave. table

Answer 2

In Planiro , you can keep the interface as simple as possible, since additional modules such as time tracking or notes are included individually for the project.
There are mobile versions and push notifications, respectively.