# cisco/ChezScheme

Chez Scheme

Repository: https://github.com/cisco/ChezScheme
Canonical: https://ross.abutalabs.com/products/chezscheme
Language: Scheme
License: Apache-2.0
License Family: permissive
Last push: 2026-08-18T15:54:56+00:00

## Health v2 (maintenance only)
Score: 85/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 59, longevity 100
- inputs: {"age_days": 3793, "days_push": 15, "days_rel": 113, "gap_med": 173.5, "n_releases_24m": 5}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7339, forks 1022 (observed 2026-08-28T04:09:58.338765+00:00)

## What it is
Chez Scheme is a high-performance implementation of the Scheme programming language, serving as a superset of R6RS with its own compiler, runtime system, and programming environment. It compiles all code to optimized machine code on the fly or ahead of time, and runs on a wide range of platforms including Windows, macOS, Linux, BSDs, mobile OSes, and WebAssembly.

## Use cases
- write fast scheme programs
- learn the scheme programming language
- compile scheme to native machine code
- embed a scheme interpreter in a C application
- run scheme on embedded or mobile platforms
- experiment with hygienic macros and continuations

## When to choose
- you need a fast, industrial-strength Scheme with a mature optimizing compiler
- you want full R6RS compliance plus extensions like threads and a C FFI
- you need Scheme on unusual platforms like WebAssembly, Android, or the BSDs

## When to avoid
- you need a language with a large general-purpose ecosystem and package manager
- you want a beginner-friendly mainstream language with abundant libraries
- you need tight integration with modern web or mobile app frameworks

## Facets
- artifact type: cli-tool
- maturity: active
- function: compiler, interpreter, programming-language
- domain: programming-languages, compilers, developer-tools
- platform: windows, bsd, cross-platform, wasm, cli
- tags: scheme, r6rs, lisp, incremental-compilation, garbage-collection, foreign-function-interface, repl, linux, macos, android, ios

## Member repositories
- cisco/ChezScheme (main) score 85

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:58.338765+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:38:27.867696+00:00, confidence not recorded.
  - readme: https://github.com/cisco/ChezScheme (fetched 2026-08-28T04:09:58.338765+00:00, sha fe9f25625755)
- Data as of 2026-08-30T08:39:29.467469+00:00.