Good idea, unusable app – GRE Challenge Review

The app starts with 20 words for free to try it out. For GRE Vocab apps, this system of studying is awesome. Unfortunately, the app is glitching every time I try to add words, both by inputting my phone number and by purchasing for $1.99 (different glitches). Thus, the app is worthless.
Review by Anarchris2032 on GRE Challenge.