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Project Management
Both Planner and Trello offer project management centered on the popular Kanban board method. You can create tasks as cards and assign them to team members, then communicate with stakeholders in comments.
Both apps also offer ways to organize projects into different views, although both emphasize Kanban. You can see a list view in Planner, and Trello lets you see calendars or timelines with a paid upgrade.
Both apps integrate with other tools to support automation and collaboration across platforms. Planner is part of the Microsoft 365 for Business suite, and Trello lets you add integrations with third-party apps using free Power-Ups like add-ons.
Data Management
Unlike some other project management tools, neither Planner nor Trello are designed with data management in mind. Both integrate with spreadsheet apps, so you can link databases to tasks and projects.
Information Infrastructure
Neither Planner nor Trello are designed to organize information, such as the way a competitor app, Notion, does. But both integrate with creative suites, so you can link to outside documentation and use Planner or Trello boards to organize it.
Planner integrates with Microsoft Office tools as part of the 365 suite. Trello integrates with major third-party applications, including Google Drive.
Creative Collaboration
To facilitate work on document and database creation with team members, Planner and Trello both integrate with workspace tools. Planner comes with a subscription to Microsoft Office 365 for real-time document collaboration and Trello integrates with Google Drive.
File Storage
Microsoft Planner outshines Trello and other competitors in file storage. With its OneDrive integration, included with your Microsoft 365 for Business plan, you get access to 1 TB of storage.
Trello offers unlimited storage with all plans, including its free plan. It limits individual file size to 10 MB for free plans and 250 MB for paid plans.
Automation
Neither Planner nor Trello include built-in automations, but both let you add on options to automate parts of your workflow. On Trello, you can add Power-Ups to add features or third-party apps that create automations. On Microsoft, you can subscribe to Power Automate for $15 per month to set up automations with all the apps you use in the Microsoft suite.