Cool! Bubble game kind of reminds me of Mindsnacks
Simple and allows you to add your own vocabulary (even English to English).
Not enough ratings yet to assess Vocab.Tutor.
Vocab.Tutor appears to be a legitimate app. AppsHunter Legitimacy Score for Vocab.Tutor is 83/100.
Based on 83 of 100 points across 7 verification signals from App Store and developer data.