Stealth interview AI: is it really invisible to screen share?

Every stealth interview AI on the market advertises the same thing: an overlay "invisible to screen share". The problem is that "invisible" means very different things depending on how the tool is built. Some are truly capture-proof at the operating-system level. Others are just transparent windows that cheerfully show up in every meeting recording.

If you're about to trust a tool with a high-stakes interview, here's how to tell which kind you're using — and how to test it before your next call.

What "invisible to screen share" really means

There are three technical approaches, and only one of them is actually safe:

Tier 1: Transparent window (not safe)

The lowest-effort implementation. The overlay window has a partially-transparent background so you can see through it. This is useless for screen share — every major meeting platform and recording tool captures everything on your display, transparency included. The interviewer sees your copilot's answers in real time. Avoid.

Tier 2: Click-through overlay (marginally safer)

A click-through window lets mouse events pass through to whatever's underneath. Useful for not accidentally covering a button, but visually identical to Tier 1 on recordings. Still shows up in every screen share.

Tier 3: Capture-protected overlay (the only safe option)

This uses operating-system-level APIs to tell the OS that the overlay window should be excluded from screen-capture APIs. On macOS this is window-sharing-none + content-protection flags. On Windows it's a display-affinity setting that explicitly excludes the window from capture. The window exists visually for you, but any capture API the OS knows about — meeting platforms, recording utilities, broadcasting tools — sees a black rectangle or no rectangle where the overlay is.

This is what production-grade copilots ship. Anything else is a liability.

What screen-sharing APIs actually see

When you share your screen, here's the actual pipeline:

1. The meeting app asks the OS for a stream of your display buffer via a system API.
2. The OS composes your display buffer from all visible windows.
3. Windows marked as capture-excluded are stripped out of the composed buffer before it reaches the capture API.
4. The meeting app encodes what it received and streams it to participants.

The key insight: capture exclusion happens at the OS level, not the application level. This means it works regardless of which meeting platform is used. The same protection applies to every major video-conferencing tool and every screen-recording utility.

How to test your stealth tool before an interview

Never trust marketing copy. Run this five-minute test the day before your interview:

1. Start a meeting with yourself (solo).
2. Share your entire screen.
3. Open your AI interview copilot and make it render content.
4. Open a separate screen-recording tool on the same machine and record the meeting window for fifteen seconds.
5. Stop recording and play back.
6. If you see the copilot overlay in the recording, it is not stealth. If you see a black rectangle where the overlay was, or nothing where the overlay was, it's capture-protected and safe.

Do this on both Mac and Windows if you use both. OS-level capture APIs change across major releases and a few tools have regressed temporarily when that happens.

Common myths

"If I'm on a second monitor, it's safe"

False. Screen-capture APIs can grab any monitor. If the interviewer is sharing your desktop, they're sharing all your monitors unless you explicitly pick a single window.

"If I make the window tiny, nobody will notice"

The window shows up in the recording at its actual pixel size. A small window in the corner is still fully visible when the recording is zoomed in. Interviewers rewatch recordings.

"Meeting platforms can't detect AI tools"

This is actually true for now — the OS protects capture-excluded windows at such a low level that meeting platforms have no API to detect them. But this depends on you using a capture-protected tool, not a transparent one.

Is stealth AI legal?

Using a personal reference tool during an interview is generally legal. Meeting platforms don't ban it in their terms of service (as of April 2026). Some companies have internal policies against it; this varies. We covered the ethics in detail here.

Our approach

Our copilot ships Tier-3 capture protection from day one — tested on every major meeting platform, every major recording tool, both macOS and Windows. We document the APIs we use and run automated screen-capture tests on every release. Download and test it yourself before your next call — the five-minute protocol above takes less time than reading another thread about it.