# sbcl/sbcl

Mirror of Steel Bank Common Lisp (SBCL)'s official repository

Repository: https://github.com/sbcl/sbcl
Canonical: https://ross.abutalabs.com/products/sbcl
Homepage: https://www.sbcl.org
Language: Common Lisp
License: NOASSERTION
License Family: other
Topics: common-lisp, compiler
Last push: 2026-08-26T20:05:37+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 95, longevity 100
- inputs: {"age_days": 5560, "days_push": 7, "days_rel": 36, "gap_med": 29.0, "n_releases_24m": 23}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2137, forks 354 (observed 2026-08-28T04:06:18.116129+00:00)

## What it is
Steel Bank Common Lisp (SBCL) is a high-performance open-source compiler and runtime system for ANSI Common Lisp. It includes an interactive environment with a debugger, statistical profiler, code coverage tool, and many extensions.

## Use cases
- compile and run Common Lisp programs
- interactive Lisp development with a REPL and debugger
- profile and optimize high-performance Lisp applications
- build cross-platform command-line tools in Common Lisp
- learn or teach ANSI Common Lisp

## When to choose
- you need a fast, actively maintained Common Lisp implementation
- you want a permissively licensed Lisp runtime across Linux, BSDs, macOS, and Windows
- you need built-in debugging, profiling, and code coverage tooling

## When to avoid
- you need a different Lisp dialect such as Scheme or Clojure
- you require a bytecode-only or very small-footprint Lisp runtime
- you need a graphical IDE out of the box

## Facets
- artifact type: library
- maturity: stable
- function: compiler, interpreter, developer-tools
- domain: programming-languages, compilers, developer-tools
- platform: windows, bsd, cross-platform, cli
- tags: common-lisp, runtime, repl, debugger, profiler, linux, macos

## Member repositories
- sbcl/sbcl (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:18.116129+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 2026-08-30T02:51:51.426198+00:00, confidence not recorded.
  - readme: https://github.com/sbcl/sbcl (fetched 2026-08-28T04:06:18.116129+00:00, sha a8611c2cd99d)
  - homepage: https://www.sbcl.org (fetched 2026-08-29T10:31:47.521187+00:00, sha 6223185cf7e3)
  - site_page: https://www.sbcl.org/index.html (fetched 2026-08-29T10:31:47.525600+00:00, sha 6223185cf7e3)
- Data as of 2026-08-30T08:39:29.467469+00:00.