Quizlet. From a learning point of view this is one of the best app I've come across in a long, long time. It's comparable for all types of mobile devices and accessible as a desktop version. The app is fantastic at engaging students into learning key terminology and enhancing their literacy skills. 

Simply type in a term and the corresponding definition, which is the saved under a topic title of your choice. By pressing on either term or definition Quizlet will speak the phrase back to you in a human manner. This enables students to hear the correct pronunciation for complex terminology. 

There are different activities that can then be undertaken from flashcards, to speller where students spell the key word from either reading the definition or hearing it being said. 

This is an augmented reality (AR) app that will mark maths addition and subtraction problems. Simply print out the worksheets solve the sum the scan it with the app.  The app will then mark the problem showing an augmented reality red cross or green tick. With the press of a button the app will also display the correct answer. A useful independent learning tool that also contains an tutorial section containing short videos demonstrating how to solve addition and subtraction questions. Once downloaded doesn't require internet access just an iOS device. 

The app is designed by WhittleJam, their website contains printable worksheets pitched at two ability levels, beginner and advanced (http://whittlejam.com). The worksheets are randomly generated each time you download them so provide a constant supply of questions. The app is particularly useful for primary students or low ability secondary students and provides an engaging and captivating way to enhance maths skills through self-assessment, and the latest augmented reality technology.

Currently available form the App Store.