Stop Chasing False Bottlenecks.

The Ultra-Accurate .NET Performance Profiler.

Get precision timings free from profiler overhead, wrapped in a clean, zero-bloat UI.

Download NProfiler

Free for non-commercial use

Deep Performance Insights. Zero Configuration Required.

Pinpoint Method & JIT Bottlenecks

Track exact execution times across your call stack and instantly see if JIT-compilation is slowing down your startup.

Line-by-Line Precision

Drill straight into your source code to see exactly which lines are slow and how often they get executed.

Expose I/O & Thread Lockups

Detect thread synchronization delays and catch painfully slow external operations like database queries or API calls.

The Sound of Silence

Engineered for Overhead Compensation.

Most .NET profilers distort their own measurements by ignoring the resource overhead they create. They show you bottlenecks that don't exist in reality. NProfiler is engineered from the ground up to mathematically subtract profiler overhead, delivering the closest thing to true production telemetry.

  • Eliminate "False Bottlenecks": Stop wasting hours optimizing code that isn't actually slow. NProfiler cleans up the noise so you only fix what’s broken.
  • Unmatched Data Fidelity: On average, NProfiler delivers significantly higher timing accuracy than standard competing tools.
  • Production-Grade Insights: Observe your application’s behavior exactly as it would run under real-world server loads—completely free from profiler-induced lag.
Learn how our overhead compensation works →

Profile Any .NET Application

From desktop executables and ASP.NET Core web apps to Windows Services and IIS/IIS Express. Seamlessly attach to any running .NET process in seconds.

Any Framework, Any .NET Language

Full support for C#, VB.NET, and F#. Profile everything from legacy .NET Framework 2.0+ apps up to modern .NET Core, .NET 5+, and .NET Standard.

Integrated Decompilation

No source code? No PDBs? No problem. NProfiler decompiles third-party components and legacy assemblies on the fly, delivering full line-level timings anyway.

Hardened for Complex Edge Cases

Built to survive where others crash. NProfiler handles complex multi-threaded interleaving, high-frequency JIT loops, and deeply nested generic calls without breaking a sweat.

Everything You Need to Solve the Hardest Performance Riddles.

Zero-Friction Setup

Launch instantly with smart defaults and tailored recommendations. Reuse saved session profiles to jump straight into profiling with a single click.

Scoped Profiling

Prevent massive application slowdowns during analysis by isolating and profiling only the specific namespaces or methods you care about.

Interactive Timeline

Track performance spikes visually over time. Click and drag to select problematic ranges and instantly filter the underlying data to that exact window.

Smart Call Tree

Get exact execution times, hit counts, and runtime events (like JIT compilation). NProfiler automatically expands poorly performing stack traces to save you clicks.

Aggregated Method List

Flatten the call tree into an aggregated list to instantly identify which utility methods or library functions have the highest cumulative impact across your entire app.

Statement-Level Precision

Drill down to individual lines of code. Hover over complex lines to inspect statement-level execution data when multiple operations share the same line.

Group by Type

Pivot your data by object type or component boundary to understand which logical parts of your architecture dominate execution time.

Exception Overhead Analysis

Uncover hidden performance taxes caused by heavy exception throwing. See exactly when, where, and how often first-chance exceptions are hurting your throughput.

Multi-Process & Thread Analysis

Isolate performance down to a single thread or scale up to inspect whole process trees, including automatically tracked child processes.

CPU vs. Wall-Time Breakdown

Instantly see if your application is bound by heavy CPU calculations or bottlenecked by blocking operations like thread synchronization, sleep states, or network I/O.

Flexible Time Units

View metrics your way. Toggle seamlessly between percentages, seconds, milliseconds, or high-precision CPU ticks for micro-optimizations.

Language-Specific Signatures

Profile any .NET language and display method signatures in the exact C#, VB.NET, or F# syntax you are used to.

Snapshot Comparisons

Save and reload profiling sessions to easily compare "before and after" metrics of your optimizations, or share snapshots directly with your team.

Contextual Guardrails

Skip the documentation. NProfiler features clean, self-explanatory UI patterns with smart inline tooltips explaining complex profiling options right where you need them.

First-Class Dark Mode

A fully optimized dark theme built to reduce eye strain and keep you focused during long, late-night profiling sessions.

Got Questions? We Have Answers.

No fluff, no marketing speak. Here are the technical details and answers to the most common questions .NET engineers ask about NProfiler.

No. NProfiler operates 100% locally on your machine. Your profiling data, source code snapshots, and decompiled assemblies never leave your computer.

NProfiler leverages the official .NET Profiling API. It runs as an isolated diagnostic tool, meaning you don't need to change a single line of code, modify your csproj, or install additional NuGet packages.

While NProfiler's overhead compensation ensures highly accurate data, any profiler introduces some CPU overhead during active measurement. We recommend using it in development, staging, or controlled testing environments rather than high-traffic live production.

NProfiler is fully optimized for Windows (Windows 10/11) and Windows Server. It allows you to profile desktop apps, services, and IIS web applications locally.

Absolutely. If you start using NProfiler for commercial or company projects, you can easily purchase a commercial license on our pricing page and swap the license key inside the app without losing your data.

NProfiler includes tailored profiling engines for both runtimes. It automatically detects whether your target application runs on the classic .NET Framework or the modern .NET Core CLR, activating the correct diagnostic pipelines under the hood.

NProfiler is heavily optimized for execution timings, CPU usage, wall-time bottlenecks, and thread synchronization. While it tracks runtime events, it focuses on making your code faster, rather than deep memory-heap/allocation snapshots.

Stop Guessing. Start Measuring With Absolute Precision.

Download NProfiler

Free for non-commercial use