Free Calculus solver for iphone?

Do you know any free app for iphone that can solve calculus problems for you?

(I found one really helpful it is a website
http://symbolab.com
But there's no actual app for these site and when I'm trying to use it in safari it doesn't work properly.)

Added (1). The one that can solve limits, derivatives and integrals

Has graphing capabilities.
Currently includes algebra, differential and integral calculus.

The app is 100% free!

You can use wolframalpha.com on your phone, or you can buy the app, I think it's like $3. The website is free though. Look into Desmos Graphing Calculator as well. There's no app, but the website works.

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