This app lets you create lists of anonymity codes and randomize participants to conditions. The different conditions can be named for ease of use. It can also calculate Cohen's d from means and standard deviations.

The created lists can be either copied and pasted into a number program or copied by hand. To do the former you either have to have this app and the number handling app on the same device or sync your pasteboard between your iCloud-devices. That way you can copy on you iPhone and then paste on you Mac.