Comprehensive, but give it time
As I used the app more and got familiar with the format of this dictionary, it has rewarded me greatly and it has been very helpful to my Spanish learning thus far (I use it quite frequent). I was very frustrated initially, because I was unfamiliar with the layout. But its got every word & wordform Ive searched for & without ads or gimmicky graphics. However, the conjugation screen terms are a bit confusing - I assume they use the British terms, which are different from American in many instances. I would recommend that they have a screen that displays the definitions (in English) of all the conjugation terms that are used (perhaps with an example), and also include the same definitions for those used in the Spanish conjugations. It seems like this app is best for young smart AP students, but Im 30 yrs beyond that & its taken me some time to re-learn all the pedagogical terms.
BensFlare about
Collins Spanish Dictionary