When the developer's called Realmac Software the likelihood of an Android version is pretty remote - and the lack of an official Android version might explain why there's an almost identically named Android app with an almost identical interface and an almost identical icon in the Play store; no, we're not linking to it. It's a shame the real one hasn't made it across, though. Clear's clever, intuitive interface couldn't be simpler, and that makes it a very fast and useful way to record anything you need to remember: notes, to-do lists, shopping lists…
Nosy Crow apps
Nosy Crow's interactive picture books have won shelves full of awards, and with good reason: they're absolutely delightful apps for younger children. The firm did dip its toes into the Android market back in 2012 with some releases for the Barnes & Noble Nook, but since then it appears to have retreated again and its latest apps are iOS-only. Shame.
Infinity Blade 3
Android gamers can usually count on the big names releasing games for their platform - *cough* Flappy Bird! *cough* - but Epic's famous hack-and-slash epics remain iOS-exclusive. While Epic Citadel delivers the same world, exploring streets isn't quite as entertaining as getting all stabby.
No, we're not being funny. Apple's iWork suite is great, and while both Google and Microsoft offer perfectly good mobile office suites in the form of Office 365 and Google Docs they aren't as nice as Apple's apps. Keynote in particular is fantastic.
Apple's iLife apps - iMovie, iPhoto - are pretty good, but Garageband is stunning: it's a really useful music creation app, and its synchronisation with the desktop version (whose files can in turn be read by the pro music app Logic Pro) means it's a great mobile tool for dabblers and professional musicians alike.