Classical, Koiné and Modern
Were someone to use this app to learn Modern Greek (which I want to learn regardless) how well would one be able to understand Koiné or Classical Greek? Would you be able to read the old philosophers like Plato or the New Testament if you understood modern Greek?
Personally, I think both Classical and Koine Greek are hard to learn for non natives, especially before they learn Modern Greek. I'd say it would be easier for someone to first learn Modern Greek, practice it regularly, study the Modern grammar and syntax in depth, and then move on to Classical or Koine Greek, so that they can compare or combine certain elements to have a better understanding.
Remember, the app all by itself isn't enough to learn a language in depth. The learner might need to actually look up or search stuff that's unclear to them, practice the language, enrich their vocabulary, maybe even try and watch a film without subtitles or read a book or an article. xP And of course, this is one of the reasons we, the mods, are here. To help you by answering your questions and provide you with any further info. ^.^
Oh, that depends on some stuff I guess. Some people have the 'ability' (not sure if it's an ability, or a skill. Let's say characteristic) to learn a foreign language or dialect quicker than others. But considering than Koine Greek is not a completely different language, I guess with a very good knowledge of Modern Greek, you could understand basic (or more) Koine or Classical Greek in a year or so, maybe a couple.
Also, by already having a very good knowledge of Modern Greek, you immediately gain access to so much more useful grammar and vocabulary resources,as well as texts, to help you with Koine or Classical Greek (I've heard that Classical or Koine Greek resources in English are not quite that many). The more resources there are, the better your learning experience becomes.^.^
Yes, I'm aware. I guess it's not something of significant demand, or probably there's nothing that really stands out. Which is why modern Greek is going to prove itself very helpful. There are many resources written in Modern Greek for Classical and Koine Greek, and some of them are truly great for the learning process. ^.^