MS Edge Compatible

MS Edge Compatible

I've never tested with Windows Edge browser, so I couldn't find this bug.

But today, the problem of Microsoft Edge browser has been fixed.

And also, the android version of this app has been released.

Regarding the security of android apps, it is said that there are 

vulnerabilities of reverse engineering and following repackaging attack. 

But the technology of PWA (Progressive Web App) is said to be safe.

The technology of It depends on browser's one, so it's as safe as

the browser you use.  Also, if you even don't like to install apk, still you

can play the browser version of this app. 

I hope people to play this app with their smartphones anywhere at any times

regardless of the  devices they use like ios, android,  windows and so on.

There are another complicated issues. The problem of copyright.

To tell the truth, I'm not an expert of abacus so I referred to lots of books

of abacus and math. And this app is like a GCD (greatest common divisor) of them.

I've borrowed lots of mathematical ideas from them without consent.

I respect the authors of those books and want to pay homage to their ideas, so

the algorithm of calculation follows their ways. Although I've added another

original ways at first, but eliminated them later because I thought my ideas are not 

sophisticated enough and not tested by so many people for a long time

and they'll confuse users. 

If my app is profitable, there might be the legal problems of copyright,  but still

it's not profitable. And I think this app won't infringe the rights of other books

but contrary this app serves as an introduction to  those relevant books if users get

interested in them seeking more knowledge.

I've found that the development of apps require me to think various complicated matters. 

But I'd like to keep updating this app when I have enough time.