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Don't know why, but my mac version can not save wav. Everything look normal, but after save, there is not file in the destination folder.

A workaround you can use is turning on the web developer tools in Safari, and viewing this page on mobile, then save that version of the page as an html file.  It took a bit of tooling around for me, but I got an effectively offline version of Chiptone that can export.

Thanks for the tip. I end up save the setting from Mac version, and paste it to this web version then save a wav file from the web version. A bit of extra work.

Another workaround it to install app for Mac, and install the web version there.