Co-creator here. We built Donezo because we know how annoying it is to assign your tasks to your team, and then have to follow up repeatedly. Donezo automates this by taking the idea behind Slack reminders and following up with each person individually before the due date. It lets you know who has completed each task and who you're still waiting on.
Right now it's in free beta, so we're really just trying to understand how can simplify existing workflows. Happy to answer any questions about how it works!