Tiny, fast & funny HTTP server

Thin is a Ruby web server that glues together 3 of the best Ruby libraries in web history:

  • The Mongrel parser: the root of Mongrel speed and security
  • Event Machine: a network I/O library with extremely high scalability, performance and stability
  • Rack: a minimal interface between webservers and Ruby frameworks

Which makes it, with all humility, the most secure, stable, fast and extensible Ruby web server bundled in an easy to use gem for your own pleasure.

IRC:   #thin on freenode


For the latest stable version:

gem install thin

Or from source:

git clone git://
cd thin
rake install


A +thin+ script offers an easy way to start your Rack application:

cd to/your/app
thin start

When using with Rails and Bundler, make sure to add gem 'thin' to your Gemfile.

See example directory for samples and run 'thin -h' for usage.


Ruby License,


The parser was stolen from Mongrel by Zed Shaw. Mongrel is copyright 2007 Zed A. Shaw and contributors. It is licensed under the Ruby license and the GPL2.

Thin is copyright Marc-Andre Cournoyer

Get help at Report bugs at and major security issues directly to me