CodeTracer for VS Code & Desktop

User-friendly time-traveling debugger, built for humans and AI

If you capture a bug in a recording, consider it squashed. Record the run, rewind to the cause, and inspect omniscient program state at every line.

Supported languages

System support: Linux / macOS / Windows
Are you interested in a specific platform? Contact us.

Features

Step backwards through time. Inspect omniscient program state, trace values across assignments, and squash complex bugs in minutes.

Value history and origin tracking

Every variable in CodeTracer has a history. You can see all the values that the variable held during the entire execution of the program and for each of them you can jump to the originating expression that computed it. CodeTracer follows the path of trivial copies in assignments to save you extra time when tracking down more convoluted bugs.

Omniscience

When CodeTracer breaks at a certain line of code, it knows not only the past but also the future. You can immediately see the values of all variables in the current function right next to the source code. This includes variables in loops where you can easily scroll through the iterations. Taken code branches are highlighted, while the non-executed code is immediately grayed out.

Call Trace

Instead of a stack trace limited to a single moment in time, CodeTracer shows you the entire tree of function calls in the recorded execution. You can navigate and filter it in various ways and the clever collapsing and expanding algorithms still allow you to obtain a classic stack trace whenever you need it.

Tracepoints

Many developers shift from interactive debuggers to print statements as systems get distributed and real-time. CodeTracer gives you the best of both worlds. A tracepoint allows you to see the effects of adding additional code to your program, without recompiling and rerecording it. Add if statements and additional function calls. Print or plot the data graphically. The output is typically produced in seconds.

Fast Navigation
‍

Since CodeTracer is aware of all past and future control flow, if offers many additional mouse and keyboard shortcuts allowing you to navigate the trace like a ninja. Step into distant functions with a single click, move back and forth through the examined moments in time like you are navigating a web browser and more.

Event Log
‍

The event log gives you a chronological view over anything of interest in your program, interleaved with the tracepoint outputs. Clicking on any event takes you to the precise moment in time when it was produced, which gives you excellent starting points for your investigations. Tracking down the origins of anomalous events and program states through the history of the involved variables is the essence of debugging with CodeTracer.

Query and Automation API for AI agents

AI agents love CodeTracer. Our rich data extraction and automation APIs allow them to quickly diagnose the root cause of complex bugs, raising the bar on what both humans and agents are capable of.

⚡ Powered by Agent Harbor →

Trusted by product builder persons

“CodeTracer eliminated hours of guesswork on hard-to-reproduce race conditions. Being able to scroll backwards through loops and jump directly to variable origins feels like magic.”

Alex Rivera

Principal Systems Engineer

“Traditional debuggers freeze execution, but CodeTracer gives you the entire timeline. You see past and future state side-by-side, which completely changes how quickly you diagnose bugs.”

Elena Rostov

Staff Infrastructure Engineer

“Attaching an execution recording to our incident reports cut our MTTR in half. Engineers can step through production crashes locally with full omniscience.”

Marcus Thorne

VP of Engineering

Choose the plan that fits your business needs

All plans include both CodeTracer’s time-travel debugger and DeepReview runtime-enhanced code review.

Free

Free for everyone

For individuals getting started

Access to CodeTracer Desktop

Access to CodeTracer for VS Code

Unlimited use for OSS languages (Python, Ruby, Noir and Stylus)

Analyze 5 native code traces per day (C/C++, Rust, ...)

Pro

$199 /annually

For professionals and teams

Unlimited use of CodeTracer Desktop and CodeTracer for VS Code for all languages

10 GB of cloud storage

100 CPU minutes of cloud replay time

100 CPU minutes of cloud replay

Enterprise

Enterprise

For collaborative use at scale

Org Single Sign On

Access control

Data retention controls

Priority Support

Training

Free

Free for everyone

For individuals getting started

Access to CodeTracer Desktop

Access to CodeTracer for VS Code

Unlimited use for OSS languages (Python, Ruby, Noir and Stylus)

Analyze 5 native code traces per day (C/C++, Rust, ...)

Pro

$19 /monthly

For professionals and teams

Unlimited use of CodeTracer Desktop and CodeTracer for VS Code for all languages

10 GB of cloud storage

100 CPU minutes of cloud replay time

100 CPU minutes of cloud replay

Enterprise

Enterprise

For collaborative use at scale

Org Single Sign On

Access control

Data retention controls

Priority Support

Training

FAQ

This section covers the most frequently asked questions to give you clarity.

Do reviewers need the desktop app?

Only when reviewing replays for C/C++, Rust and other natively compiled languages on Linux. Replays for Python, Ruby and other interpreted languages can be fully explored in the CodeTracer web IDE.

What languages are supported today?

dvaPython, Ruby (Linux & macOS, full web replay) C/C++, Rust and others (Linux desktop replay). New languages are frequently added.

Is Windows supported?

Python, Ruby (Linux & macOS, full web replay) C/C++, Rust and others (Linux desktop replay). New languages are frequently added.

What’s inside a trace?

The execution trace of your program captures every program state over time.

Can I use my own AI agent?

Yes. You can call agents from within CodeTracer or use external agents.

Can I attach multiple replays to a single PR?

Yes: you can attach an arbitrary number of replays as links. These will be opened in the CodeTracer web IDE.

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