Used the website after finding it online when I was looking for help with algebra. I saw a recommendation to download the app, and didn't really want to because I figured it would glitch out, have tons of ads, and require you to pay extra just to do basic things. Boy, was I wrong. Everything is free besides removing ads for two dollars, and they are so non-intrusive that it doesn't even matter anyway. The app works wonders and doesn't just tell you the answers. It details all the work, and while it could do some things better, like having decimal form, fraction form, mixed number form, and maybe even a percent form, it's fine as it is. If they added those things it would be the best math app ever.