# clojure-emacs/cider

The Clojure Interactive Development Environment that Rocks for Emacs

Repository: https://github.com/clojure-emacs/cider
Canonical: https://ross.abutalabs.com/products/clojure-emacs-cider
Homepage: https://cider.mx
Language: Emacs Lisp
License: GPL-3.0
License Family: copyleft
Topics: cider, emacs-lisp, clojure, emacs, clojure-development
Last push: 2026-08-26T13:52:39+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 82, longevity 100
- inputs: {"age_days": 5245, "days_push": 7, "days_rel": 41, "gap_med": 71.0, "n_releases_24m": 11}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3677, forks 653 (observed 2026-08-28T04:08:13.660652+00:00)

## What it is
CIDER is an Emacs package that turns Emacs into a full interactive development environment for Clojure and ClojureScript. It connects to a running Clojure process over nREPL to provide compilation, code completion, debugging, documentation lookup, testing, and a rich REPL experience.

## Use cases
- set up a Clojure IDE in Emacs
- interactively evaluate Clojure code from my editor
- debug Clojure programs with a source debugger
- run Clojure tests from Emacs
- get code completion and doc lookup for Clojure
- connect Emacs to a running nREPL server
- do REPL-driven development in ClojureScript

## When to choose
- you develop Clojure or ClojureScript and use Emacs as your editor
- you want an interactive, REPL-centric workflow like SLIME for Common Lisp
- you need integrated testing, debugging, and documentation lookup for Clojure

## When to avoid
- you don't use Emacs (consider Calva for VS Code or Cursive for IntelliJ)
- you only need syntax highlighting without a live REPL connection
- you work in a language other than Clojure

## Facets
- artifact type: plugin
- maturity: active
- function: editor, developer-tools, testing
- domain: developer-tools, programming-languages, text-editors
- platform: editor-plugin, cross-platform
- tags: clojure, clojurescript, repl, interactive-programming, nrepl, emacs-lisp, ide, debugging, emacs

## Member repositories
- clojure-emacs/cider (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:13.660652+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 2026-08-29T18:31:15.591145+00:00, confidence not recorded.
  - readme: https://github.com/clojure-emacs/cider (fetched 2026-08-28T04:08:13.660652+00:00, sha 696b1195c912)
  - homepage: https://cider.mx (fetched 2026-08-29T09:25:11.358254+00:00, sha 25fb14ee4af4)
  - site_page: https://docs.cider.mx/cider/basics/installation.html (fetched 2026-08-29T09:25:11.367187+00:00, sha 2b2ed8d17a6a)
- Data as of 2026-08-30T08:39:29.467469+00:00.