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Calculator IOS apps

Dear experts,

I was looking at videos which complement Good notes 4. I can came across the one below:
https://www.youtube.com/watch?v=jOG48N5U6CE&t=8s


The presenter is discussing, at time scale 8m  32sec, an app where i could write math formulae (not using key board) on an app and it calculated the result.
I have my Itunes account with country as India. I do not think it is available for India Itunes account.

I use good notes for writing my MAth theorems from Real analysis, measure and integration, number theory, linear algebra, vector spaces, ODE/PDE, probability.

Kindly can anyone provide me a list of similar apps ranked by preference.

I will then look for those which are available for India.

Kindly guide.me.

Thank you
Comment
Watch Question

How about Evernote?  The basic version is free and quite popular.  Why would you spend $7.99 on Good Notes?

Author

Commented:
Hi Serialband,

Thank you

Does evernote calculations like what 'Calculator' was performing in the above video?

I would like to mention that my question is for math calculation (similar to the one shown in the video) and not for note-taking app.

Kindly guide me.

Author

Commented:
serialband,

Below is the app i was referring to

https://www.youtube.com/watch?v=zIQ3UxHyzpA
I got that one back when it was offered for free.  I didn't know that you were just looking for a calculator.  I thought you also needed a note taking app.  OneNote will do both.