I watched the video and scrolled to the bottom of the page. I don't know what they're selling - is it just the stylus thing? Does it work with every app, or jus

I watched the video and scrolled to the bottom of the page. I don't know what they're selling - is it just the stylus thing? Does it work with every app, or just their one? Is it only for ipads, or can I use it on an Android? Then I noticed they spelt "ginkgo biloba" wrong on the sketch underneath the video. Twice. And then I closed the tab.