There must be hundreds of clock apps in the iTunes App store! And there are a few 24 hour dials in there somewhere.
The Astrock app is a software version of the famous Prague Orloj.
Developers: if you want people to find and buy your 24 hour analog dial apps, don’t expect them to scroll through pages and pages of apps in the App store. Why not let the connoisseurs know directly, by getting your app displayed on this site? (If it’s interesting and relevant to this site, I’ll give it a mention. If it’s just another boring 12 hour clock, don’t expect one!)