Interview Copilot Chrome Extension vs Desktop App

Of 613 LastRound sessions recorded between 21 March and 1 August 2026, 121 were tagged as coding rounds. Those are the rounds most likely to require sharing a full desktop or a collaborative editor, and they’re the rounds where a browser extension is structurally at a disadvantage.

That’s roughly one session in five. If you’re choosing between an extension and a desktop application, that ratio is the whole decision.

Why the form factor decides everything

A Chrome extension lives inside the browser. Whatever it draws is part of a page or a browser panel, which means it exists inside the region the browser can be asked to capture.

A native desktop application draws to the operating system. On several platforms it can render in a layer that screen capture skips, which is why desktop tools handle full-screen sharing and browser tools generally don’t.

This isn’t a quality difference between vendors. It’s a difference in what each form factor is technically able to do.

The three share modes, and what survives each

The bottom-right cell is the one to verify yourself. “Depends on implementation” is the honest answer, and any vendor claiming otherwise across all platforms is overstating.

Which rounds ask for a full screen

In practice, three situations tend to require it. A shared coding environment where the interviewer wants to watch you navigate. A system design round using a whiteboard tool. Any round where the interviewer asks you to walk through your own local setup.

Conversational and behavioural rounds usually need no screen share at all, which is why extensions feel fine right up until they don’t.

Google Meet’s presenting documentation lists the three modes explicitly, and it’s worth knowing which one your interview platform defaults to before the call rather than during it.

Other extension-specific problems

Beyond visibility, three things catch people out.

Background tab throttling. Browsers aggressively slow inactive tabs to save battery. If the extension’s work happens in a tab that isn’t focused, responses arrive late and you’ll blame the model.

Audio routing. Extensions capture audio through the browser, so a call taken in a desktop client rather than a browser tab may be inaudible to the extension entirely. This one fails completely rather than partially, which at least makes it obvious.

Permissions and updates. An extension that requests broad access to page content will show that in its permission prompt, and some corporate machines block installation outright. If your interview is on a company laptop, check this early.

So which should you use

If every round you have is conversational and browser-based, an extension is lighter and perfectly reasonable. Installation takes seconds and there’s nothing to configure.

If any round involves code, a shared editor, or a full-desktop share, use a desktop application and verify it with a recording first. Our desktop copilot exists specifically for that case, and the free tier includes the hiding behaviour so you can test it before committing.

I can’t tell you which category your interviews fall into, and plenty of people genuinely never need the desktop path. But the failure is asymmetric: choosing the extension and discovering the limit mid-interview costs you the round, while choosing the desktop app and not needing it costs you a download.

What the browser actually allows

It helps to know the mechanism rather than guessing at it. Extensions capture audio and video through documented browser APIs, and those APIs decide the limits.

Chrome’s tabCapture API documentation is explicit that capture is scoped to a tab and requires an explicit user gesture to start. That’s why an extension can hear a call running in a browser tab and hears nothing at all from a desktop meeting client. It isn’t a limitation the vendor chose.

The same scoping explains the visibility question. MDN’s guide to the Screen Capture API describes how the browser hands a page a stream of a tab, a window, or a whole display. Anything drawn inside the browser sits within that display stream. There’s no browser-level mechanism for a page to exclude itself from it.

So when a vendor says its extension is hidden during screen share, the honest reading is “hidden when you share a different tab”. That’s true and useful. It isn’t the same claim as being hidden generally.

One more practical point about updates. Extensions update themselves on the browser’s schedule, and an update can land the morning of your interview and change behaviour you’d already tested. Desktop applications usually ask before updating. If you’ve verified a setup, check it again the day before rather than assuming last week’s test still holds. It takes two minutes and it removes the one variable you can’t otherwise control.

Frequently asked questions

Is there an interview copilot Chrome extension?

Several vendors ship one. They work well for browser-based calls where you share a tab or a single window, and they’re limited when a round requires sharing your whole screen, which is a constraint of the form factor rather than the product.

Can a Chrome extension stay hidden during screen share?

During a single-tab or single-window share, usually yes, because the other content isn’t captured. During a full-screen share, no. Anything drawn in the browser is inside the captured region.

Extension or desktop app: which is better?

Extensions are simpler and fine for conversational rounds. Desktop apps handle full-screen sharing, which coding and system design rounds often require. Roughly one in five of our recorded sessions is a coding round.

Why is my extension responding slowly?

Most often background tab throttling. Browsers slow tabs that aren’t in focus, so the extension’s processing stalls whenever you switch away. Keeping the tab active, or moving to a desktop app, resolves it.

Will my work laptop let me install one?

Often not. Managed devices commonly block extension installation and restrict permissions. Check before your interview day, and use a personal machine for the call if you have the option.

Bottom line

Pick the form factor from your hardest round, not your easiest one.