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We[1] take a different approach to language learning by focusing on usable, real language from the get go. It's more of a phrasebook that uses games and activities to get the vocab you need into your memory than a grammar learning engine.

[1] http://utalk.com/app (App Store link)

"A planned or constructed language (sometimes called a conlang) is a language whose phonology, grammar, and vocabulary have been consciously devised for human or human-like communication, instead of having developed naturally. It is also referred to as an artificial or invented language."

http://en.m.wikipedia.org/wiki/Constructed_language

Well, they are coming out with Klingon sometime in the next year. Granted, it's a small language, but it seems they are amenable to conlangs. Maybe, they will also have an ability to add your own conlang, so that you and friends can communicate and expand the lang.