The Planner Hub runs in your web browser and holds all the plans you create and plans where you have membership.
It Includes:
- Hub-only plans
- Teams plans (you can add a Planner to a Teams channel and use it there, but it will still be present in the Planner Hub on Office.com) .
Here's the link to the Planner Hub. Alternatively, go to Office.com and navigate to Planner from there.