Simple, intuitive and powerful
You might think a simple outliner wouldnt be that useful, but Workflowy is more powerful than it might at first seem. Check out the Workflowy blog for tips on how to use it in ways you might not imagine at first. I use it mostly on the web with a computer, but the IOS app is great for mobile use. Works seamlessly with the web version when you are online, & even if youre not you can work offline & it will sync up as soon as youre back online. Very happy with this overall!
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WorkFlowy: Note, List, Outline, v1.2.10