Does CodeSignal Detect a Second Monitor?

2026-09-19

If you work with two screens every day, unplugging one for a test feels strange. It is natural to wonder whether CodeSignal can tell a second monitor is connected.

Here is what CodeSignal does and does not document.

CodeSignal does not say publicly whether it detects a second monitor. What it does document is that proctored tests ask you to share your entire screen, record it, and reject results where the candidate "used other devices during the assessment."

What proctored tests ask for

In a proctored CodeSignal assessment, screen sharing is part of setup. The help center says "When you make it to Step 3: Share Screen, select "Entire Screen" in the pop-up modal."

That screen is then recorded. CodeSignal says "Please note that your screen will be recorded."

CodeSignal also added a check for partial sharing. Its October 2025 update reads: "Candidates now warned if they are not sharing their full screen during proctored assessments"

What is not documented

CodeSignal's public docs do not say:

• whether it can count how many displays are connected
• whether sharing "Entire Screen" captures one display or all of them
• whether a second monitor on its own affects your result

Treat anything you read elsewhere on these points as a guess, not CodeSignal's word.

What reviewers look for

The documented focus is on your workspace. During proctoring setup, "Step 3 will prompt you to close all unrelated tabs, browser windows, and applications."

After the test, CodeSignal's reviewers check the recording. Common reasons a result is not verified include:

• "Test-taker used other devices during the assessment"
• "Test-taker searched online for help (other than syntax-related searches)"

Keep in mind that not every test is proctored. CodeSignal says "Some CodeSignal assessments include remote proctoring and an identity verification step in order to ensure the validity of your results."

For more on what the recording covers, see does CodeSignal record your screen.

What this means for you

If your test is proctored, the simplest move is to run it on one screen with nothing else open. That matches what CodeSignal's setup asks for.

If it is not proctored, CodeSignal's docs do not describe any monitor check. For how another platform treats this, see does HackerRank detect external monitors.

One screen, less worry

A second monitor is usually about having help within reach. StealthCoder is a desktop app that runs separately from the browser. It reads the problem on your screen and helps you work through it, and the overlay stays invisible during screen share.