crystal-icr ☆

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Description:
Interactive console for Crystal programming language

Type: Formula | Latest Version: 0.9.0@3 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: repl crystal interactive development console

Install: brew install crystal-icr

About:
ICR (Interactive Crystal) is a REPL (Read-Eval-Print Loop) environment for the Crystal programming language. It provides a powerful interactive shell with syntax highlighting, auto-completion, and multi-line editing. It allows developers to test code snippets, inspect objects, and explore APIs in real-time without compiling full programs.

Key Features:

Syntax highlighting and auto-completion
Multi-line editing with readline support
Persistent history across sessions
Integration with existing Crystal toolchain

Use Cases:

Testing Crystal code snippets interactively
Learning and exploring the Crystal language
Debugging and inspecting objects at runtime
Rapid prototyping of algorithms

Alternatives:

irb – Ruby's REPL; ICR provides similar functionality specifically optimized for Crystal's syntax and type system
crystal play – Official playground; ICR is a local CLI tool rather than web-based

License: MIT

Dependencies: bdw-gc, crystal, libevent, libyaml, openssl@3, pcre2, readline

Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, arm64_ventura, arm64_monterey, sonoma, ventura, monterey, arm64_linux, x86_64_linux

Version History

Detected	Version	Rev	Change	Commit
Sep 13, 2025 8:10pm		3	VERSION_BUMP	73b52359
Dec 9, 2023 8:31pm		3	VERSION_BUMP	b491579a