What is Reddit's opinion of Learn Vietnamese Pronoun?

From 3.5 billion Reddit comments

There is this app that I use to learn and refresh Vietnamese pronouns and family titles: https://play.google.com/store/apps/details?id=com.ionicframework.vnpronoun2794112

The interface is meh, but the content is good - at least that's what people tell me. There is ad, but you can turn it off in the settings. It covers all kind of pronouns and titles, e.g. colleagues, people you meet on the street, family members. It also covers Southern and Northern Vietnamese. Hmm.... when thinking about it, it's really good. And free at that. lol