Programming language: Crystal
License: MIT License
Tags: Web Frameworks    
Latest version: v0.2.3

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Full featured MVC Web Framework for the Crystal programming language, largely inspired by Ruby on Rails (ie. implements most of its API).

Frost is to Ruby on Rails what Crystal is to Ruby: similar API, developer hapiness and productivity, but enhanced with static typing (mostly hidden) and incredible performance.


Frost is in developer preview, and must be considered alpha software until further notice. Features may be added, dropped, tweaked, or changed at any time. Please experiment with Frost, contribute to Frost, let's make it incredible, but build software with it at your own risk!

TLDR: using Frost is like using Crystal. It's great, but be prepared to fix your software on a regular basis.

You've been warned :-)


Start by cloning the Frost repository, then use the application generator to bootstrap your project. For example for a myapp application:

$ git clone https://github.com/ysbaddaden/frost.git
$ crystal frost/src/cli.cr -- new myapp
$ cd myapp
$ crystal deps install

Getting Started

Nothing fancy, just the regular flow:


  • write migrations in db/migrations;
  • create models in app/models;
  • write tests in test/models.

Application Logic:

  • add routes to config/routes.cr;
  • create controllers and actions in app/controllers;
  • design views in app/views;
  • write tests in test/controllers.

See Getting Started With Frost for an example.


Since Crystal introduces changes on a regular basis, Frost may not compile with the version of Crystal you are using.

The Frost master branch should follow changes in Crystal's master branch, and thus require the Crystal master branch.

Frost releases should always be usable with the latest Crystal release. In some cases it may require the previous Crystal release. In this case, switching to the Frost master branch should fix the compilation errors until a new Frost release is made.


Thanks for considering to contribute! Please see CONTRIBUTING to get started.


Distributed under the MIT License. See MIT-LICENSE


  • The Ruby on Rails Team that modeled an awesome framework.
  • Julien Portalier (@ysbaddaden) for bringing it to Crystal.

*Note that all licence references and agreements mentioned in the frost README section above are relevant to that project's source code only.