# Col-E/Recaf

The modern Java bytecode editor

Repository: https://github.com/Col-E/Recaf
Canonical: https://ross.abutalabs.com/products/recaf
Homepage: https://recaf.coley.software
Language: Java
License: MIT
License Family: permissive
Topics: java, bytecode, bytecode-engineering, reverse-engineering, jvm-bytecode, decompile, decompiler, agent, asm, javafx-application, javafx, static-analysis, bytecode-manipulation, java-decompiler
Last push: 2026-08-22T01:53:52+00:00

## Health v2 (maintenance only)
Score: 69/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 13, longevity 100
- inputs: {"age_days": 3324, "days_push": 12, "days_rel": 367, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7355, forks 538 (observed 2026-08-28T04:09:58.454057+00:00)

## What it is
Recaf is a modern Java bytecode editor with a JavaFX GUI that abstracts away low-level class file complexities like constant pools and stack frame calculation. It supports editing, decompiling, deobfuscating, and recompiling Java and Android applications, plus attaching to running JVM processes for instrumentation.

## Use cases
- edit java bytecode of a compiled jar
- decompile obfuscated java classes
- deobfuscate a minecraft mod jar
- rename obfuscated classes and export mappings
- attach to a running java process and instrument it
- patch anti-reverse-engineering class file tricks
- assemble bytecode from a simple syntax

## When to choose
- you need to inspect or modify compiled Java or Android bytecode with a GUI
- you are reverse-engineering obfuscated JVM applications
- you want multiple configurable decompilers and mapping export in one tool

## When to avoid
- you only need a headless bytecode manipulation library - use ASM directly
- you need to reverse non-JVM binaries
- you cannot run JDK 22+ with JavaFX 22+

## Facets
- artifact type: application
- maturity: active
- function: reverse-engineering, security, developer-tools, gui, plugin-system
- domain: reverse-engineering, security, developer-tools
- platform: cross-platform, jvm
- tags: java-bytecode, decompiler, deobfuscation, javafx, asm, bytecode-editor, static-analysis, android-support, java, desktop

## Member repositories
- Col-E/Recaf (main) score 69

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:58.454057+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 2026-08-29T17:38:25.887243+00:00, confidence not recorded.
  - readme: https://github.com/Col-E/Recaf (fetched 2026-08-28T04:09:58.454057+00:00, sha 922d6a364c76)
  - homepage: https://recaf.coley.software (fetched 2026-08-29T08:33:50.798404+00:00, sha 78e9dd371db7)
  - site_page: https://recaf.coley.software/user/install/index.html (fetched 2026-08-29T08:33:50.808338+00:00, sha 44ccf7c38dde)
  - site_page: https://recaf.coley.software/user/install/requirements.html (fetched 2026-08-29T08:33:50.810587+00:00, sha 1e7b9330a686)
  - site_page: https://recaf.coley.software/user/install/via-launcher.html (fetched 2026-08-29T08:33:50.812454+00:00, sha f5b142652640)
  - site_page: https://recaf.coley.software/user/install/via-manual.html (fetched 2026-08-29T08:33:50.814354+00:00, sha 0fe85e05a4db)
  - site_page: https://recaf.coley.software/user/install/why.html (fetched 2026-08-29T08:33:50.815897+00:00, sha e926d457d6ad)
  - site_page: https://recaf.coley.software/dev/getting-started.html (fetched 2026-08-29T08:33:50.817594+00:00, sha f1f801afdbfe)
- Data as of 2026-08-30T08:39:29.467469+00:00.