Readthis is a Redis backed cache client for Ruby. It is a drop in replacement for any ActiveSupport compliant cache and can also be used for session storage. Above all Readthis emphasizes performance, simplicity, and explicitness. For new projects there isn't any reason to stick with Memcached. Redis is as fast, if not faster in many scenarios, and is far more likely to be used elsewhere in the stack. See this blog post for more details.