There are 25 categories in total in the full app which you can buy as an in-app purchase. The Free version has limited categories, Alphabets and Numbers to look at.
Other categories include Land transport, Body Parts, Family and Countries and Flags.
KIDS Opedia works on a L.A.R.A model (Learn, Assess, Report, Analyse).This application is not only meant to teach kids but allows them to test their knowledge through a variety of quizzes. It further allows the parents / guardians to view the Quiz reports and analyze their kids progress.
You can choose which options to work on first, either Learn or Assess and then have a detailed report logged of the areas your child needs to work on or succeeded well at.
For the holiday season the child characters are wearing santa hats and stand against a snowy backdrop.
There are more than 25 categories and 500 flashcards bundled into a single app. The app also provides more than 5 different quiz modes. Additionally it has a strong and robust reporting mechanism. Parents can create multiple profiles and thus use the same app for more than one kid. You get all of this in just 99 cents. So it's a very good price for the amount of choices you get.
Definitely download the app for free and if you want more categories and options you can unlock them with a 99c in-app purchase. It's ideal for children from 3-6. You can read more about the developer here.