Can CodeSignal detect Cluely?

CodeSignal runs its assessments in the browser, and a web page has no ability to enumerate the applications running on your machine. There is no scan of your process list and no published signature for Cluely, any alternative to it, or any other overlay. That part of the question has a straightforward answer.

What the platform does collect is a different category of signal:

• Code similarity. Submissions are compared against a large body of prior and public solutions. This looks at the artifact you produced, not the software you were running.
• Session events. Tab switches, full-screen exits and paste events are logged with timestamps.
• Proctoring, when the employer enables it. Webcam monitoring and screen recording are configuration choices made by the company, not defaults you can assume are off.

The distinction matters because the two most commonly asked questions have opposite answers. Can CodeSignal see Cluely installed? No. Can CodeSignal end up with evidence that your answers were not yours? Yes, through a route that never needed to identify the tool.

This is the part that makes CodeSignal different from platforms where the question is purely about screen visibility. An overlay that is genuinely invisible to screen capture still hands you text, and that text becomes your submission. If the code closely matches solutions already in the corpus, the similarity report flags it regardless of how the code reached your editor.

Flags do not auto-reject. They route to a human who reviews the report alongside your session events and, if proctoring was on, the recording. In practice that reviewer is looking for a story that holds together: code that matches a public solution, arriving in a single paste, from a candidate who left full screen twice, reads as one narrative rather than three unrelated signals.

You have probably seen the claim that a given tool is undetectable, and the honest version of that claim is narrower than it sounds. This section names the boundary. An overlay is hidden from a specific thing, which is the capture of the window it excludes itself from, and nothing beyond that.

• Screen recording during the assessment. If CodeSignal is recording your screen and the tool renders in that capture, it is in the recording. Behaviour differs by operating system and by capture method, and it changes with OS releases.
• A second monitor or phone. Not captured by a screen recording, but plainly visible to webcam proctoring through eye movement and posture.
• A company-managed device. Endpoint management can inventory installed applications directly. This has nothing to do with CodeSignal and is the exposure people forget.
• Screen share, if a live round follows. A recruiter asking you to share your screen sees whatever is composited into the shared surface.

Consider a candidate taking a timed CodeSignal assessment for a backend role on a laptop issued by their current employer. The assessment platform never identified any tool. The device management console had a full application inventory the whole time. The threat model that mattered was never the one they were researching. More of these boundaries are mapped on the detectability hub.

SubcueAI treats proctored assessments as out of scope, and that is a product position rather than a disclaimer. Live assist is built for conversational interviews: a real-time transcript of the interviewer, with structure suggested while you speak, on a desktop app or a browser side panel that captures the meeting tab audio. Nothing joins the call and nothing is injected into the meeting page. None of that helps in a timed coding assessment, and using it where a platform prohibits outside help is the thing that gets offers pulled.

The preparation that does transfer is unglamorous: rehearse the assessment format until the timer stops being the difficulty. Practising a timed problem set out loud, with follow-up questions, is what mock interviews are for. What SubcueAI does and does not cover is set out on the plans and trust hub.