Is there an App for determining the current capacity of an Apple watch battery?
No - neither is there a public API for apps to do this on any iOS device. Clearly there are private API (heres one version for iOS / not watchOS) and occasionally someone slips an app by review knowing full well that's against the rules - but they generally get pulled quickly or fail to work / crash.


Is there an iPhone app (as opposed to desktop software) that shows actual battery cycles - cycles number