Here is a link that shows some features of one of these educational apps Global History Regents Buddy If you are a teacher who would like to try to implement these apps in your classroom for free please emailFrederick.feraco@gmail.com for a promo code.
I can give you promo codes for these apps Bio Regents Buddy, Chem Regents Buddy, Physics Regents Buddy, Earth Science Regents Buddy, Environmental Science Buddy, Human Body Buddy, Global History Regents Buddy, US History Regents Buddy, Astronomy Buddy, Geometry Regents Buddy, Health Ed Buddy and Integrated Algebra Regents Buddy.