I think the value from Langliter comes from two areas:
1. The NLP processing and tooling built on top of that processing 2. Its superior mobile experience
If I just used a simple form of tokenization, I think I could very quickly deliver a superior mobile experience than what is currently available from similar apps. However, I'm not sure if PoS tagging and some of the other techniques I'm using translate to those languages or if they do, how much value they'd add to the learning process.
But it's something I'll certainly revisit if the app ends up being popular and I have the resources to do it properly.