I studied Spanish for years but never really learned it until I was immersed for a few months. Now that I don’t use it often I find it to be a struggle to retain.

I’ve been toying with language apps myself. I still think there’s a place for apps. For example, I have an iOS Word Search game for several languages:

https://itunes.apple.com/us/app/h4labs-word-search/id1311744...

I’m toying with other ideas. Basically, ways to entertain oneself for short periods of time.