If, like me, you want to use an outliner that is available across multiple platforms and syncs with Evernote then Xwavesoft’s Cloud Outliner could be for you. Especially as for today only it is available for free on iOS.
Available on Mac, iPhone and iPad the apps allow you to create structured lists which are synchronised between the devices and Evernote too if you wish.
Note that synchronisation is only available in the paid version of the apps and not the free “lite” version.
If this sounds like your sort of thing download the iOS version today as it is currently free!