Quiz up is the best learning app I know because it has unlimited topics. I have learnt alot from quiz up in the past few weeks and it is fun too. It allows you to choose your topic and then a quiz is put up in front of you and you are given a opponent to compete with and then 10 questions are displayed on that topic and you answer them correctly you win. You can play with your friends too and see who is the intelligent one amongst the two. It is a very useful application as it covers all topics from general knowledge to history to bollywood to science to grammar and what not. As you win and increase with your levels you get rewards and different titles according to the topic who have scored well in. Interesting to play and alot to learn. The layout and design of the app is also very attractive and well made. It is easy to use and any age group can try this as it covers universal topic. I really liked the concept of learning with fun.
Overall the app is really really good and everyone should try it .