But how you gonna use excel when you have no access to computer? Thats why I started working on this. I just needed something, when Im at work.

I will update that calculator, add more funcions etc. - this is just first version.

About app, Im really thinking of it, but I have just poor html, php skills. It work on mobiles, good enough for now. I set google analytics there and if enough people interested I may hire someone to help me with the App.

Thanks for your opinion