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You can add checklists to cards, rate them and more. The cards themselves currently have quite some restrictions in formatting them, but offer everything that is important: You can add comments, upload attachments, assign cards to users (yes, it is a multi-user-system), schedule due dates, there are email notifications. You create cards, which behave pretty much like issues or single entries in other systems. Instead of just using vertical lists, it presents rows (lists) and items (cards). The main differentiator to me is that it makes consistent use of a grid structure. Well, it is a project management tool, which is little surpising after the introduction. Recently, I use it more and more and consider it an alternative even to Redmine for smaller projects and projects that just involve myself, though my shopping list I still run on Evernote. I tried it, did not use it much, and came back to it. So to make an impression on users beyond those that stumble upon your product and just stick with it, a project management tool / task list has to differentiate. It makes you feel like in a really big supermarket where they got 325 sorts of sausage: one feels overwhelmed and gives up. Digging through the sheer volume of new stuff has become quite a task. Wunderlist, Evernote, Catch, Producteev, Redmine, Basecamp, Unfuddle.
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Or least it feels like that at the moment. Project management tools, services, tasklists and everything in between pop up a dozen a week.
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