mattwparas/steel

Health v2 · maintenance only

Adoption not part of the score

2546 stars · 135 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Steel is an embeddable Scheme dialect interpreter implemented in Rust, running on a bytecode virtual machine with mostly R5RS compliance. It includes a standalone REPL/CLI interpreter, a package manager, and a language server, and integrates easily with native Rust functions and structs.

Use cases

• embed a scripting language in a Rust application
• script my Rust program with a scheme interpreter
• try scheme in the browser
• learn scheme with a modern REPL
• call Rust functions from a lisp script
• extend an app with user-defined macros and contracts

When to choose

• you need an embeddable scripting language in Rust with native FFI
• you want a mostly R5RS-compliant scheme with modules and macros
• you want a standalone scheme REPL plus language server

When to avoid

• you need full R7RS compliance or let-syntax today
• you need a battle-tested pre-1.0-stable API for production
• you need a mature ecosystem like Guile or Racket

Facets

cli-tool · maturity active

interpreter programming-language cli sdk programming-languages developer-tools rust cross-platform cli wasm scheme lisp embedded-scripting bytecode-vm r5rs repl language-server transducers contracts interpreter command-line

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