One of the types of software that’s important for a web developer is the web framework. A framework “is a code library that makes a developer’s life easier when building reliable, scalable, and maintainable web applications” by providing reusable code or extensions for common operations. By saving development time, developers can concentrate on application logic rather than mundane elements.
A web framework offers the developer a choice about how to solve a specific problem. By using a framework, a developer lets the framework control portions of their application. While it’s perfectly possible to code a web application without using a framework, it’s more practical to use one.
Crystal is a general-purpose, concurrent, multi-paradigm, object-oriented programming language. With syntax heavily inspired by the language Ruby, it is a compiled language with built-in static type-checking, but specifying the types of variables or method arguments is generally unneeded. This adds the benefit of a shallower learning curve.
Here’s our recommended free and open source web frameworks for Crystal captured in a legendary LinuxLinks’ chart. Only free and open source software is eligible for inclusion here.

Explore the 8 Crystal web frameworks. For each program we have compiled its own portal page, a full description with an in-depth analysis of its features, together with links to relevant resources.
| Crystal Web Frameworks | |
|---|---|
| Lucky | Full-featured Crystal web framework that catches bugs |
| Kemal | Very simple web framework |
| Amber | Web framework that makes building applications fast, simple, and enjoyable |
| Marten | Enables pragmatic development and rapid prototyping |
| Grip | Microframework for building RESTful web applications |
| Spider-Gazelle | Rails esque web framework |
| Orion | Omni-conventional, declarative framework inspired by ruby-on-rails router |
| Onyx | Powerful general purpose framework with type safety |
This article has been revamped in line with our recent announcement.
Explore our comprehensive directory of recommended free and open source software. Our carefully curated collection spans every major software category.This directory is part of our ongoing series of informative articles for Linux enthusiasts. It features hundreds of detailed reviews, along with open source alternatives to proprietary solutions from major corporations such as Google, Microsoft, Apple, Adobe, IBM, Cisco, Oracle, and Autodesk. You’ll also find interesting projects to try, hardware coverage, free programming books and tutorials, and much more. Know a useful open source Linux program that we haven’t covered yet? Let us know by completing this form. |

