You probably all know that the native iPhone Stocks app doesn't do spot values on PMs. On my way to the bullion shop, I was searching for an app that shows PM values so that I could verify their prices (pulling up web pages is generally slower than an app) and came across this free one:
iGoldline
I haven't really played around with it much but it does everything I need, and this give me the spot price of silver and gold (it also does Platinum and Palladium). Appears to update prices every minute or so if you let it sit. It also does stock markets, news etc. I've only had it installed for half a day but I like what I see so far. Haven't seen any ads yet.
Sorry if this is in the wrong forum but I didn't see one more appropriate than this one since this applies to Precious Metals. No affiliation with the developer - just thought y'all might find it useful.