Khan Academy is hands down the best out there. Being a math major with upper level classes, there aren't any tutors once you get to your junior year in college. With a, not so good professor, students need all the help they can get if they can't turn to faculty for help. Khan academy is actually suggested by all of the professors on campus should a student need help. I've been using it for yeas and highly recommend it to everyone I talk to.
I'm surprised people say it is not helpful. I myself find this app quite interesting to me honest. Not only is it free it helped me get straight a pluses for three tests in a row thanks Sal and company. Plus it is meant to be boring so why complain idiots.
This app would be great if it downloaded content properly for offline viewing. The download process freezes at random. Sometimes if I remove the bookmark, then apply it again several times, it might download. Please fix this problem! It would be great to actually download bookmarks!
So good in fact, that I wish I had something like this during my years at school. You young people don't know how lucky you are, to have access to something like this. Nice app you've got going here mate. I hope you can include more topics to study in the near future. Keep it up. Maybe add some simulation exercises.
I HIGHLY HIGHLY recommend this app if you want to brush up on math from any level. The math courses have really helped me understand the high school math I struggled with. One small problem I found is that moving the dots to the accurate position on a co-ordinate plane is too awkward on a touch screen.
I really enjoy Khan Academy however the app sucks because it won't even allow me to sign in . the profile page has a long list of ways to sign up along with a sentence long description, but to sign in is all the way at the bottom. That only shows eagerness to have people sign up to Khan Academy, but not for those are already there. Should definitely be catering to those you have then not. It's sad because I desperately need math explanations.
Bug fixes and improvements.