(Human written) I learned Chinese at intensive programs like Middlebury language schools where you can get fluent in 8-weeks. GraphChinese maps those concepts into a dependency graph that allows you to learn the most important 20% of the language for 80% of usage in conversation. 49 USD for lifetime access and I'm the one manning the feedback button - please reach out if you'd like a feature! We've got quite a few happy users now, most starting from scratch!