I haven't, but I know it works fine. Heroku is more of a Rack host than a Rails host, so any Rack-based framework (AFAIK, all Ruby frameworks at this point) run

I haven't, but I know it works fine. Heroku is more of a Rack host than a Rails host, so any Rack-based framework (AFAIK, all Ruby frameworks at this point) run seamlessly on it.