A task manager for the task managers, Nice. I do see a need gap. Is this aimed towards Business/Office users? If so, a slack and other team communication apps integration could be very useful.
For personal tasks, integration with major personal task managers such as any.do, Google Calendar, Apple Calendar etc. are necessary. I see that you support Google Calendar already, Apple Calendar integration with EventKit should be possible as well; but 3rd party integrations with apps such as any.do wouldn't be easy.
Although an end consumer in me see the need gap for task managers for all task managers, but not as much as the need for business user in me for Unidash.