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Merb

Merb was a discontinued Ruby web framework built around the model–view–controller pattern.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Merb was a discontinued Ruby web framework built around the model–view–controller pattern. It was known for a small core, modular architecture, and emphasis on speed and flexibility, and it later influenced Ruby on Rails 3. The project was first released in 2006 and development was later merged into Rails 3.

History

Merb was created in the mid-2000s by Ezra Zygmuntowicz and released publicly in 2006. It later became known as an influence on the Rails 3 redesign, after which active Merb development ended.

Design and features

Merb was built around modularity, a small core, and optional plugins. Sources describe it as fast, lightweight, and flexible, with support for different ORM and template choices.

Relationship to Ruby on Rails

Merb was positioned as an alternative to Rails and was often compared to it because both used MVC. Rails 3 incorporated ideas from Merb, especially around modularity and a cleaner internal architecture.

Legacy

Although discontinued, Merb is remembered for influencing later Ruby web development practices. Its design helped shape Rails 3 and contributed to broader discussion about modular framework architecture in the Ruby community.

Key facts

  • Merb was a Ruby web framework designed as a lighter, more modular alternative to Ruby on Rails.
  • It emphasized a small core and plugin-based extensibility rather than a monolithic design.
  • Merb was described as ORM-agnostic and able to work with multiple supporting libraries and components.
  • The project was first released in 2006, with an early public release noted at RubyConf 2008.
  • Merb development stopped after its code and ideas were folded into Rails 3.

Frequently asked questions

What was Merb?
Merb was a Ruby web framework that used MVC and focused on being small, fast, and modular.
Who created Merb?
Merb was developed by Ezra Zygmuntowicz.
Was Merb related to Ruby on Rails?
Yes. Merb was an alternative to Rails, and its ideas were later merged into Rails 3.
Why was Merb notable?
It was notable for its modular design, small core, and emphasis on flexibility and performance.
Is Merb still maintained?
No. The project was discontinued after its development was folded into Rails 3.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Merb
    Supports: Overview, MVC architecture, discontinuation, Rails 3 influence, and name origin.
  2. gihyo.jp — https://gihyo.jp/dev/serial/01/ruby/0013
    Supports: First release date, creator, Ruby framework description, and modular design.
  3. InfoWorld — https://www.infoworld.com/article/2320762/merb-framework-offers-alternative-to-rails.html
    Supports: Modular architecture, performance focus, and comparison with Rails.
  4. Campus Technology — https://campustechnology.com/articles/2008/10/merb-rails-alternative-takes-modular-approach.aspx
    Supports: Name origin, modular architecture, MIT license, and Rails alternative positioning.
  5. Larry Ullman — https://larryullman.com/2008/12/30/rails-and-merb-ruby-frameworks-to-merge/
    Supports: Merge of Merb ideas into Rails 3 and the transition away from Merb as a separate project.