DevonThink JUST came out with the brand new iOS app - DevonThink togo 2. App has been worked on from scratch. I am right now looking how I can integrate it with my Evernote or if I need Evernote at all. New DevonThink for iOS syncs 100% with my DevonThink on my MAC (no PC-versions available). Saw I can use Dropbox as well but do not like cloud services for my personal data. App is cheap and absolutely no subscriptions. Will come back when I tested it more. Looks promising looking at the reviews in the App Store though.