I\'m a big fan of the MiniProfiler created by Jarrod Dixon and the Stack Overflow team for ASP.NET. Is there a port of it for Rails applications?
Since the core of the
Rackbug is a Rack application, adds a diagnostics toolbar to Rack apps, it looks similar with MiniProfiler.

Take a look at features list:
It can work on every environment you specified with restriction by IP address