Why you don't need a dedicated app for this
Searching an app store for a 'spinner wheel app' usually turns up several options cluttered with ads, in-app purchases, or permissions requests unrelated to spinning a wheel — for something you might use once and not again for weeks, that's a lot of overhead.
Because Spinzelvo runs entirely in the browser, opening it on an iPhone or Android phone gives you the same functionality as a native app — big touch targets, smooth animation, working sound — without an install step or app store account.