NDepend: A C# Static Code Analysis Tool

If you have a C# codebase and are looking for a tool to improve its code quality, NDepend, a proven static code analysis tool, is your most feature-rich option. NDepend can reveal anything that your codebase may be trying to hide from you.

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Why NDepend?

NDepend is straightforward to install and easy to use.
It produces interactive web reports that can be produced from any CI/CD or DevOps technology (Azure DevOps, GitHub Actions...) on any operating system, Windows, Linux or MacOs.
It analyzes code written with latests versions of .NET and C#.
NDepend can focus on the changes since a baseline snapshot of your code base, enabling you to enhance newly written code before it reaches production.
NDepend provides actionable advices written in plain-english about how to improve your code.
It integrates with Visual Studio and interacts side-by-side with Rider and VSCode.
With a seamless PASS/FAIL Quality Gate approach NDepend offers the required level of flexibility to enforce what really matters for your organization.
It is lightning fast and achieves in seconds what other tools actually achieve in minutes or hours ( we promise, give it a try ).
It is straightforward to customize and extend because all of its features rely on C# LINQ queries, which are compiled and executed in real-time against your code.
You'll get an immediate, visual representation of your code's health and structure and also the ability to monitor how it looks over the lifetime of your project.

What NDepend Checks in Your C# Code

Static code analysis inspects your C# code without running it. NDepend analyzes the whole code base, including the dependencies between projects, namespaces, types and methods, and checks it against 235 default rules. Each rule is a short, readable CQLinq query (C# LINQ over the code model) that you can adapt or extend:

Code Smells (10), for example Avoid types too big and Avoid types with too many methods.
Object Oriented Design (14), for example Avoid interfaces too big and Base class should not use derivatives.
Design (16), for example Avoid custom delegates and Types with disposable instance fields must be disposable.
Architecture (13), for example Avoid namespaces mutually dependent and Avoid namespaces dependency cycles.
Dead Code (5), for example Potentially Dead Types and Potentially Dead Methods.
Security (39), for example Software Composition Analysis (SCA) and Transitive Software Composition Analysis (SCA).
Immutability (15), for example Fields should be marked as ReadOnly when possible and Avoid non-readonly static fields.
Visibility (12), for example Methods that could have a lower visibility and Types that could have a lower visibility.
Naming Conventions (23), for example Instance fields naming convention and Static fields naming convention.
API Breaking Changes (9), for example API Breaking Changes: Types and API Breaking Changes: Methods.
Code Coverage (15), for example Code should be tested and New Types and Methods should be tested.

Each issue comes with an estimated technical debt, and quality gates can fail the build when new code adds critical issues. Results are available in Visual Studio, in CI and in the HTML report, and NDepend.AI steers your coding agent to fix the issues found.

Trusted by the Industry

NDepend was created by developers for developers. It has been a tool trusted by 12.000+ companies since 2004.

"NDepend is giving me insight into my apps that I hadn't had before. Once I realized the depth and breadth of the information I was looking at, I was like a kid in a candy shop."

Scott Hanselman Program Manager at Microsoft

"When you have to analyze a lot of code there is no better static analysis tool than NDepend"

Andriy Buday Experienced Austrian .NET Developer

See a hundred more testimonials