Prefix the Bugs in Your Code

Understand what your code is doing and find bugs you didn’t even know existed.

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Prefix is used by over 20,000 developers in more than 140 countries!

Find a bug, you're a hero!

Use Prefix every day while you are writing and testing your code.

Can I use Prefix?

Prefix is designed for daily use by developers who are developing .NET or Java web applications.

Note: Prefix currently only works on Windows.
We plan to support .NET Core/.NET 5, Java, Python, Ruby, and Node.js on Windows and macOS as well as PHP on macOS soon.

Download Prefix Now for Free!

By submitting your email address, you agree to be contacted via email about our products and services. You can unsubscribe at any time.

Prefix supports .NET & Java applications running on Windows.

Tour Prefix in 90 Seconds

Feature Highlights

View Your Logs by Request

Stop sorting through messy log files. See the exact log messages for a single web request.

Find Hidden Exceptions

Prefix can instantly show you all the exceptions hidden in your code.

Quickly Spot Suspicious Behaviors

People see things with Prefix they never expected. Why does that web request do 38 database calls?

View SQL Queries

Including SQL parameters, affected records and how long it took to download the result set.

Prefix vs. Standard code profiler

Prefix web request profiler

Captures detailed code-level traces of each web request.

Prefix is designed to be used every day.

Standard code profiler

Provides method and line level performance reporting.

Typically used only when CPU usage is high.

Prefix is perfect to run on your second monitor!

Want to see see Prefix in action?

Prefix vs Retrace

Not sure what the differences are between Prefix and Retrace? No problem!

For your workstation

Lightweight web request profiler

For your servers

Developer friendly APM