Chart tools give you a flat PNG or a heavy JS widget. Volumine gives you a link. Build a 3D chart in the browser, no account, and paste the link into your site, Notion, Confluence or a deck. It keeps spinning and fits whatever space the page gives it. 148 KB, one request, zero cookies, zero third-party calls: it adds nothing to your privacy policy. Custom geometry, not a library with a 3D flag. Transparent background, so it sits in your page, not on top. Free. €19 once, no subscription.