A copilot can live in exactly three kinds of place, and the place decides what an interviewer receives. A second browser tab stays out of a tab share but appears in the tab strip the moment you share the browser window. An extension panel splits in two: a browser side panel escapes a tab share, while a panel injected into the page is inside the shared tab by definition. A native window excluded from capture at the operating system level is absent from all three modes, because the compositor removes it before the frame ever reaches Zoom.
The three places a copilot can live
People compare "extension versus app" as though it were a packaging decision. It is not. It is a decision about which rectangle your helper is drawn inside, and every screen sharing mode captures a different rectangle.
- A browser tab. A web app you open in a second tab and read by switching to it, or by tiling two Chrome windows side by side. No install, no permissions, nothing sitting on the machine, and no way to look at it without leaving the tab you are working in.
- An extension surface. Three different things wear this one label. A toolbar popup, which closes the instant it loses focus and is therefore useless while you type. A side panel, drawn by Chrome along the edge of the window, beside the page. And an in-page panel injected by a content script, which is ordinary HTML added to the interviewer's page, floating over the editor.
- A native window. A normal desktop window, which can additionally be marked so that Windows strips it out of any capture before the capturing application receives a single frame. It stays lit on your own monitor and is simply not in the encoded video.
That last mechanism is the only one on this page that is not a matter of geometry. The other surfaces are hidden or visible depending on where the capture rectangle happens to fall. An excluded window is removed by the operating system regardless of where it sits, what it overlaps, or which mode you picked.
What each surface transmits, share mode by share mode
Every cell describes what the other participants receive, not what your own monitor shows. Read the tab share column first, because it is the mode most interview platforms ask for and the one people most often assume is safe.
| Where the copilot is drawn | Sharing one Chrome tab | Sharing a window | Sharing your entire screen |
|---|---|---|---|
| A second browser tab | Not transmitted. Capture is bound to the chosen tab's viewport, and the tab strip sits above it. | Transmitted. Share the Chrome window and its title and favicon are readable in the strip, and reading it puts the whole page on screen. | Transmitted, along with everything else on that display. |
| Extension toolbar popup | Not transmitted. The popup is browser chrome anchored above the page, outside the captured rectangle. | Generally transmitted, since it is drawn over the browser window. Capture paths differ here, so verify rather than assume. | Transmitted. It also dismisses itself the moment you click back into the editor. |
| Extension side panel | Not transmitted. The panel sits beside the viewport, not inside it. | Transmitted in full. It is part of the Chrome window you selected. | Transmitted in full. |
| In-page panel injected by a content script | Transmitted. It is DOM inside the page, so it is inside the captured viewport. | Transmitted. | Transmitted. |
| Ordinary native window | Not transmitted. It is not part of any tab. | Not transmitted if you shared a different window, though an overlapping window can bleed into older capture paths. | Transmitted. It is just another window on the display. |
| Native window excluded from capture at OS level | Absent. | Absent, even when it overlaps the shared window. | Absent. The compositor removes it from the display capture. |
The injected panel trap
Row four is the one worth stopping on. Advice about screen sharing converges on "share a single tab, it leaks the least", and for browser chrome that is true: the address bar, the bookmarks bar, your other tabs and the downloads bubble all stay out of the frame. But a content script writes into the same document the page renders. Whatever it draws is page content, and page content is exactly what a tab share is designed to send.
There is a second consequence that has nothing to do with video. Because an injected panel lives in the page's own DOM tree, the page's own JavaScript can observe it. Any script on that origin can walk the document, or watch it with a mutation observer, and see nodes it did not create. Whether a particular assessment platform actually does that is a question about that platform, and I am not going to assert a specific behaviour for one. The structural point stands without it: a side panel and a native window are outside the document, and an injected panel is inside it.
So the ranking flips depending on the mode. Under a tab share, an injected panel is the worst of the six surfaces and a side panel is fine. Under a window share, the side panel is fully visible and a second tab is barely better. Under a full screen share, everything except an OS excluded window is on camera.
Where the interviewer's voice actually comes from
Visibility is only half the comparison. A copilot that cannot hear the question cannot answer it, and this is where the two architectures diverge hardest.
| Capability | Browser extension | Native Windows app |
|---|---|---|
| Audio it can reach | A tab it is permitted to capture, or your microphone. | System playback loopback, meaning the mix your output device receives. |
| Interview held in the Zoom or Teams desktop client | Out of reach. That audio never passes through the browser. | Works, because loopback does not care which application produced the sound. |
| You are wearing headphones | Removes the microphone fallback entirely. | Works. Loopback taps the output stream, not the room. |
| Marking itself out of a screen capture | Not available. That flag is a window property, and a page does not own a window. | Available for every window it owns. |
| Installation | Store install, usually with no administrator rights. | An installer, which a managed laptop may refuse. |
| Operating systems | Anywhere Chrome runs, macOS and ChromeOS included. | Whatever the vendor builds for, and nothing else. |
The Interview Copilot in OfferPilot AI takes the loopback route and transcribes on device with Whisper, which is why headphones are the recommended setup rather than a problem to work around. Roughly a second passes between the interviewer finishing a sentence and a speakable draft appearing.
Prove all of this on your own machine in six minutes
Do not take a vendor's word for any row above, mine included. Every claim on this page is testable before it matters.
Start a solo meeting and join it from your phone
Google Meet or Zoom, with the phone muted and its speaker off so nothing echoes. The phone is standing in for your interviewer and it is the only honest evidence in the room.
Open the copilot surface you actually plan to use
Not a screenshot from a product page. The real panel, in the browser profile you will interview from, on the editor page you will be given.
Share one tab, then look at the phone
An injected panel appears here. A side panel, a popup and a second tab do not. This single test settles most of the argument.
Stop, share the Chrome window, look again
Now the side panel, the extension icons and every tab title are in frame. If you only ever test tab share, the day an interviewer asks for a window will be a surprise.
Share your entire screen, look again
Everything except an OS excluded window is now transmitted, notification toasts and taskbar badges included.
Take a screenshot with Win+Shift+S and open the saved file
Screenshot and recording paths are not the same code as a live share. Judge it on the image on disk, not the preview thumbnail.
For a browser based coding round, the arrangement that survives all three modes is a shared editor tab plus a native window beside it. That is how Code Copilot is meant to be used: the problem stays in the tab you are sharing, and the working notes stay in a window that is not in the frame.
What the extension model genuinely does better
Three real advantages, none of them about screen sharing.
- It installs where an executable cannot. A locked down corporate laptop that refuses installers will often still allow an extension from the store. If you cannot install software on the machine you interview from, the comparison is already over.
- It runs on hardware a Windows app never will. ChromeOS, macOS, a Linux desktop. A Chromebook has no native option at all, so the choice there is an extension or nothing.
- It asks nothing of the operating system. No loopback audio device, no window level flags, no background process. For some people that is the deciding factor and it is a reasonable one.
What it cannot do is opt out of a capture, because that decision is made by the window manager about a window, and an extension does not have one to mark. Any comparison that skips past this is quietly comparing convenience with convenience.
Where OfferPilot is the wrong tool
Plainly, so nobody discovers it at the worst moment. There is no browser extension. It is Windows 10 and 11 only, with no macOS, Linux, ChromeOS or mobile build. On a Chromebook, on a Mac, or on a machine where IT blocks installers, an extension based product is the better fit, and the table above is the honest reason why.
Capture exclusion also has a hard boundary that gets blurred in marketing everywhere. It covers screen sharing, screen recording and screenshots. It does nothing about a webcam, a lockdown browser that owns the whole machine, a proctor watching you in person, eye tracking, or a phone propped up as a second camera. Eyes travelling repeatedly to one side read as exactly that on video, whatever is or is not inside the share. And in a proctored assessment running inside a lockdown browser, none of this applies at all. That is not the situation these tools are for.
Choosing, in two sentences
If the interview audio comes out of a desktop client, and any of the three share modes could be asked for, a native window that the operating system keeps out of the frame is the only surface that behaves identically in all three columns. If you cannot install software, or you are not on Windows, take a side panel over an injected panel, keep the copilot out of the tab you are sharing, and treat a window share request as the moment to close it.
Related guides
- How Apps Hide From Screen Sharing on Windows (and the Limits)
- Does a Zoom, Teams or Meet Recording Capture My Whole Screen?
- Will My Notifications Show When I Share My Screen in Teams?
- Whereby Screen Share: What Others Can See in Each Picker Tab
- Webex Share Application vs Share Screen (and Share a Portion)