# dnSpy/dnSpy

.NET debugger and assembly editor

Repository: https://github.com/dnSpy/dnSpy
Canonical: https://ross.abutalabs.com/products/dnspy
Language: C#
License Family: other
Archived: true
Last push: 2020-12-20T23:55:15+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4081, "days_push": 2082, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 29689, forks 5621 (observed 2026-08-28T04:11:53.621568+00:00)

## What it is
dnSpy is a Windows GUI application for debugging and editing .NET and Unity assemblies without needing source code. It combines a debugger, a C#/VB assembly editor with IntelliSense, an IL editor, and a hex editor with .NET metadata awareness.

## Use cases
- debug a .NET assembly without source code
- edit and patch a compiled .NET dll
- debug Unity game assemblies
- inspect and modify IL code in an assembly
- reverse engineer a .NET application
- set breakpoints in third-party assemblies

## When to choose
- you need to debug or patch .NET/Unity assemblies with no source available
- you want an integrated debugger, decompiler-style editor, and hex editor in one tool
- you need to edit low-level .NET metadata or IL bodies

## When to avoid
- you need a cross-platform debugger - dnSpy is Windows-only
- you want actively developed tooling - the last release was December 2020 and the project is in maintenance
- you only need to decompile assemblies to read code rather than debug or edit them

## Facets
- artifact type: application
- maturity: maintenance
- function: reverse-engineering, security, developer-tools, editor, gui
- domain: reverse-engineering, security, developer-tools, gaming-tools
- platform: windows, dotnet
- tags: net-debugger, assembly-editor, decompiler, hex-editor, unity-debugging, il-editing, desktop

## Member repositories
- dnSpy/dnSpy (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:53.621568+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 2026-08-29T16:52:54.391010+00:00, confidence not recorded.
  - readme: https://github.com/dnSpy/dnSpy (fetched 2026-08-28T04:11:53.621568+00:00, sha 7644f81ee093)
- Data as of 2026-08-30T08:39:29.467469+00:00.