Well, there is the Oxford Dictionary of Philosophy on the Apple app store. It could be a useful reference for students in class or when reading papers. Then again, so is wikipedia, putting your hand up, or keeping up in the readings.
I don't know of any, but I've been thinking through a design for a Logic App for some time. The first iteration would focus primarily on defining fallacies and include several quizzes for practice. The biggest challenge for getting it off the ground is writing and collecting the examples. If anyone here would like to help out with that - which would be wonderful! - you can submit your sample fallacies here: https://docs.google.com/spreadsheet/viewform?hl=en_US&formkey=dHdBcURNU3hGcHZqcG1ZWTZONVg1Zmc6MQ#gid=0
Maybe an app for students to prompt them to ask that question? Random timer that makes an annoying buzz until they ask and you give them the ever-rotating shut-off code?
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