frum review
A focused, open-source Ruby manager with project pinning and automatic switching.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
frum is an open-source command-line Ruby version manager written in Rust. It is designed for developers who need to install, remove, inspect, and select Ruby versions across macOS, Linux, and Windows. Global and project-local version commands let teams control the Ruby version used by a project, while .ruby-version support provides a file-based way to pin that choice. Its scope is intentionally narrow: Ruby management rather than a broader collection of language runtimes or SDKs.
For daily version handling, frum covers the core workflow from installation through selection. It can list installed and available Ruby versions, install specified versions, and uninstall versions that are no longer needed. Automatic directory-change handling applies project-local versions as you move between directories. Bash, Zsh, and Fish shell initialization, along with shell auto-completion, fit command-line workflows. Ruby installation options include OpenSSL and jemalloc, giving users control over parts of the build configuration.
The published installation paths include Homebrew, Cargo, Arch Linux packages, and release binaries. That range supports different operating-system and package-management preferences, although setup remains a command-line task involving shell integration. frum is a strong choice for Ruby-focused developers who want a free, open-source manager with cross-platform support and project pinning. Teams managing several programming languages, SDK families, or CI workflows that require verified CI support should choose a broader or more CI-oriented alternative instead. The latest listed GitHub release is v0.1.2, and the repository documents a current main branch.
frum pros and cons
- Where it wins
- Supports Ruby version management on macOS, Linux, and Windows
- Reads .ruby-version files and switches versions by directory
- Offers OpenSSL, jemalloc, shell integration, and completions
- Where it doesn't
- Manages Ruby rather than multiple languages or SDK families
- Does not provide verified CI support
- Requires command-line setup and shell initialization
frum fact sheet, pricing and score →
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