Yes, Codex Interview is free to try it out, feel free to download and use it. Each user can create two rooms for free, and you can invite your friends to join the room during 6 hour sessions. If you want to create more rooms, you can subscribe to our pro plan.

What programming languages are supported?

Codex Interview currently supports a wide range of programming languages, including JavaScript, Python, Java, C++ and Go. You can find the full list of supported languages in the documentation.

How does Codex Interview work?

Codex Interview creates a real-time collaborative coding pad that stays invisible during screen sharing. You share your screen on the interview call while a trusted teammate joins your Codex pad from anywhere and helps you through each problem live—real human answers, no AI guesswork.

Is Codex Interview secure?

Yes—Codex Interview is built with security in mind. All data is encrypted both in transit and at rest, and we enforce strict access controls so that only you (and anyone you authorize) can view your data. And rest assured, your interviewer will never see your private workspace.

How can I get support?

If you have any questions or need help, you can reach out to our support form in the dashboard. We also have a community forum where you can ask questions and get help from other users.

How it is working?

Your smartest friend,
invisibly in the interview room

A real-time coding pad that stays completely invisible on screen share. A trusted teammate joins you live and helps you through every problem
real human answers, zero AI hallucination.

Start Free — No Credit Card Required

Download for Mac Download for Windows

Your Screen

Interviewer's Screen

Trusted by 437+ Devs Hired at Top Companies

The app stays active but never shows an icon, so no one can tell it's running.

Demonstration

This video will show you how Codex Interview works in action. You can also try it out yourself by downloading the app and running it on your machine.

A real teammate, not a guessing AI

AI copilots hallucinate and fall apart on the hard questions. Codex is different: a trusted teammate joins your interview through an invisible coding pad and feeds you correct, real-time answers — no AI guesswork. Just install the desktop app and invite whoever you trust before you start.

How it works?

Feature	Codex	Interview Coder	Other AI Products
Invisible on screen share
Invisible in Dock & tray
Real human answers (no AI hallucination)
Answer accuracy	Human-verified	Can hallucinate	Can hallucinate
Price	Free + $60/mo	$299/mo	—

Invisible to which platform?

As explained in our Tech Explain section, Codex Interview operates at the kernel level, making it undetectable on all browser-based meeting platforms. Below is an up-to-date list of platforms where Codex Interview performs reliably. Additionally, we strongly recommend using our testing tool before your actual interview to ensure everything functions properly.

Undetectability

Codex is designed to be invisible to the interviewer
here is how we ensure that works.

Screen SharingCodex Interview is completely invisible to screen recording software, making it perfect for coding interviews.

Active Tab DetectionToggle the application window without your cursor losing focus, ensuring a seamless experience during coding interviews.

Normal Eye ContactMove the window around to overlay on top of your code editor, so you eyes never wander. Position it to maintain natural eye contact with the interviewer.

Webcam MonitoringGlobal shortcuts to toggle the webcam on and off, so you can focus on coding without worrying about your webcam being on.

Codex InterviewA collaborative coding environment that allows you to practice coding interviews with your friends.

Command Palette

Use the command palette to quickly access all of Codex's features.

Hide/Show Window

Hide or show Codex Interview

Move Window

move the window around your screen without touching the mouse

Refresh Window

Refresh the Codex Interview application

Quit the Application

Quit the Codex Interview application

Find a plan

Codex Interview is simple and transparent pricing for everyone.

Try Codex for Free

See how it works

2 free Codepads
Real-time collaboration
Live help from a trusted teammate
Multi-language syntax highlighting
Code execution
History and persistence
24/7 customer support

$0 / month

Get started

Codex Pro

Monthly subscription

Unlimited Codepads
Real-time collaboration
Live help from a trusted teammate
Multi-language syntax highlighting
Code execution
History and persistence
24/7 customer support

Secure checkout powered by Stripe.

$60 / month

Get started

Codex Enterprise

For large teams

Boost productivity with our Business and Enterprise⁠ plans.

Unlimited pads and fully access to your database, workspace and infrastructure.

Enterprise-grade security, admin controls, SAML SSO, and compliance with GDPR and CCPA.

Chat with Bigocodes

Frequently Asked Questions

Here are some common questions about Codex Interview.

You have concerns on browser detection?

As you know, most interview platform will detect your actions. Like browser tabs switch, onLostFocus, we also have a test environment for you to test before the interview.

Test it out

Your smartest friend, invisibly in the interview room