I was also wondering how that works.  

 It's a website not a app or program you download 😬

Coinos.io 

 So that means it should be operable on Android…? 

 Yes.   

 yes ma'am, anything that has internet and a browser.  

 Just click on the link: coinos.io 

 You and #nostr are the coolest. 

 I think they mean a browser, just as clueless as you 😆 

 Web based is browser accessible vs app download 

 If you want to use the site on android you can do so via the browser on your phone. Their site design is responsive.