1. Khan Academy
The number one application (IOS or Android) I have used in school and on my own is Khan Academy. They offer a wide variety of subjects like math, science, economics, finance, history, and the arts as well as test prep for tests like the SAT, NCLEX, and more.
This app teaches you these topics by showing videos of an instructor teaching and giving sample problems before and after you watch the video. The best part of this app, for me, is that you can watch a video on a specific problem. They have a data base of over 2,000 videos. If I am looking for a video about graphing inequalities, I can search the phrase and find several videos at several different levels about graphing inequalities. It is an excellent score for reteaching a topic that was confusing the first time around.
Highly Recommended App!
This app is fun to use and has great content. You can scan through hundreds of videos and pictures and learn science facts while you click through the app's multimedia. The only bad thing about this app is that you can't search for specific content topics. If you are interested in science and just want to learn a few new things and broaden your science knowledge, this app is perfect. As it relates to classes, this app is not the way to go to find specific content.
Skillshare is an app for the aspiring artist and creative student. Skillshare provides videos on design, photography, DIY projects, and businesses. There are video tutorials you can watch and there are also classes you can take through the Skillshare app. This app is a self paced app and you can go through the content and choose the topics you want to learn about and take classes based on your free time and your schedule. This app is for creative students who want to learn more on their own about creative arts.
Peak is a fun app that helps to condition and improve the cognitive functioning of your brain. Peak uses fun memory, problem solving, focus, and attention games to help improve the processes of the brain. It tracks your progress and makes games harder when you succeed at them. Peak was developed by neuroscience experts, so you can be assured that the games are reliable. Peak offers a free version and a "Pro" version for $4.99 a month. I would recommend this app because it offers fun games to keep you interested, but also the games help develop brain functioning skills.