Immunity Debugger is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is IDA. It's not free, so if you're looking for a free alternative, you could try Ghidra or Cutter. If that doesn't suit you, our users have ranked more than 10 alternatives to Immunity Debugger and six of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Immunity Debugger are Binary Ninja (Paid), Hopper (Paid) and c[ode]clap (Paid).