How to Block Cluely and Interviewcoder to Prevent Cheating?

One of the most common ways candidates cheat in virtual interviews today is through hidden overlay applications—tools like Cluely or InterviewCoder that render answers or guidance directly on top of the screen while remaining invisible to the interview platform. These tools typically work by taking screenshots of the interview question, sending the image to an LLM, and displaying the generated answer in a covert overlay for the candidate to read.

If the overlay cannot capture the screen, the entire cheating pipeline breaks. By blocking screenshots, we effectively disable the app—and with it, the cheating attempt.

At Blindspots, we built exactly this mechanism. We use the same class of screen-capture protection technology deployed by platforms like Netflix and Hulu. Interview questions are rendered inside a protected video surface, making them unreadable to screenshot-based tools while remaining fully visible to the candidate.

As shown in the video above, when a cheating app attempts to capture the screen under Blindspots’ protected video surface, the screenshot fails—causing the app to error out and preventing it from generating any response.

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