Best AI interview assistants: what each one does well, and where it fails

Three kinds of AI interview assistant

Not long ago, "AI that helps you during an interview" was a curiosity. Today it is a small software category with real products in it. The premise is the same everywhere: while you talk to the interviewer, an AI listens or reads the question and gives you an answer. What differs is where that answer appears - and that one difference decides almost everything else.

• Overlay prompters (Vizir, Cluely, Interview Coder) are desktop apps that draw hints on a translucent layer above whatever else is on your screen. The defining trick of the category is keeping that layer out of a browser screen share.
• Browser copilots (Final Round AI) live in a tab: they transcribe the call and show hints in a panel beside it.
• General chatbots (ChatGPT and its equivalents) were never built for interviews, but they are free and already open on your machine.

One thing to check before you install anything: a whole class of "AI meeting assistants" works by sending a bot into the call, which then shows up in the participant list as a guest. That is fine for taking notes in a team standup and catastrophic in an interview. None of the five tools below works that way - they all run on your own machine or in your own browser - but some vendor sites are vague enough that it is worth confirming before you click install.

When you compare them, four questions matter more than any feature list:

1. Where do the hints appear, and who else can see that surface?
2. Does the tool cover the whole interview, or one slice of it?
3. Does it run on your operating system?
4. Can you pay for it the way you actually pay for things?

Vizir: a desktop overlay with a published visibility map

Vizir is a desktop prompter for macOS and Windows. It listens on two channels at once - your microphone and the interviewer's audio - and transcribes both in real time. When a question lands, a hotkey puts a ready answer on the overlay, and you say it in your own words.

For technical rounds it also reads the screen: one shortcut captures whatever is in front of you (a code snippet, a problem statement, an architecture diagram) and sends it to a vision model, another generates a solution with the reasoning spelled out. That covers live coding, system design and behavioral rounds in one tool rather than one round of the three.

Nothing is recorded on your machine and nothing is stored on Vizir's servers. Audio streams to a speech-to-text provider, the text goes to an AI model, the hint comes back to your screen. No file of the conversation is created. What those providers keep on their side is set by their own terms; the details are on the privacy page.

With Vizir, only you see the hints, and that promise is carried by two screens rather than one. During browser screen sharing (Google Meet, web Zoom and Teams, live coding pads like CoderPad) the overlay stays out of the capture. Where the system hands over the whole screen - native desktop clients on macOS 15 and up, or a local screen recorder - the hint goes to the end-to-end encrypted phone companion instead: a second screen you are not sharing. Which case is which is spelled out on the visibility map, rather than summed up as a promise of invisibility.

Where it wins

• Covers the entire interview, not one section: live speech, screen capture, follow-up questions.
• Runs on both macOS and Windows. The macOS build is the reference one and the Windows build usually trails it by a release, so test on the machine you will actually interview from.
• Two ways to pay: by card (a Tribute subscription through Telegram) or in crypto (USDC). The crypto path needs no card and no billing address. An email address is still required for the account.
• Free trial with no card required.
• Publishes its limits instead of burying them.

Where it does not

• A native client on macOS 15 and up, or a local screen recorder, can capture the overlay. Those cases run through the phone companion, which means a phone in reach and a glance away from the camera.
• It does nothing against webcam proctoring, and the site says so plainly.
• After the trial it is a paid subscription, with no permanently free tier (current plans are on the pricing page).
• It is a small product from an anonymous operator, not a funded startup with a support desk. If a recognizable company name behind your tools matters to you, that is a real objection.

You can test it without a card: download Vizir, run a fake call with a friend and see for yourself before it counts. Role-specific playbooks live in the use cases section.

Cluely: the best known name in the category

Cluely more or less created this market. Its launch made AI overlays a mainstream topic, and the product has moved fast since. It listens to the call and shows hints on a translucent layer; according to its developers, that layer is excluded from screen capture. Positioning is broader than interviews - it is sold as an assistant for sales calls and meetings too.

Where it wins

• The most mature product here, with a real team shipping regularly.
• A desktop app; check their site for current platform support.
• Their site lists a free tier to try it on.
• Brand recognition, which matters if you want to read a hundred user reviews before committing.

Where it does not

• Paid plans sit at the premium end of the category, going by public pricing. Check the current number on their site before you assume it is comparable.
• The marketing leans hard on invisibility. The underlying mechanism is the same window-exclusion feature everyone uses, with the same dependence on your OS version and on what is doing the capturing, so confident phrasing is not the same as a stronger guarantee.
• Card payment, per their checkout at the time of writing, with a normal subscription trail.

A point-by-point breakdown is on the Vizir vs Cluely page.

Interview Coder: built for LeetCode and nothing else

Interview Coder solves one problem deeply: algorithmic rounds. You capture the problem from your screen and get a working solution with complexity analysis and an explanation of the approach - exactly what a LeetCode-style screen demands. The developers state that the app window is excluded from screen capture.

Where it wins

• Genuinely strong in its niche, including the explanation of why the solution works, which is what you actually have to narrate.
• A desktop app; check their site for current platform support.

Where it does not

• Built around problems on a screen, not a live conversation. Behavioral questions, system design and ordinary back-and-forth are outside its scope.
• English only, per their site.
• Card payment only, per their site.

If your loop is nothing but algorithms, it does the job. If there is a hiring manager round after the coding screen, you will need something else beside it. See Vizir vs Interview Coder.

Final Round AI: a browser copilot with a prep suite around it

Final Round AI is not an overlay. The copilot runs in a browser tab: it transcribes the call and shows suggestions in a panel. Around that sits a full preparation platform - their site lists mock interviews with an AI interviewer, resume tooling and a question bank.

Where it wins

• Nothing to install, which matters on a locked-down work laptop.
• The best preparation toolkit of the five, by a distance.
• The developers claim support for dozens of languages.

Where it does not

• The hints live in an ordinary browser tab. Share your whole screen and the tab is right there; share a single window and the copilot sits in a different one, so you are switching attention between two windows mid-answer. This is the honest structural difference between a copilot and an overlay.
• Subscription by card, per their site.
• Being a web app, it is tied to your browser rather than to whatever native client the interviewer asked you to install.

Detailed comparison: Vizir vs Final Round AI.

ChatGPT: free, excellent for prep, deaf during the call

Plenty of candidates just use ChatGPT on a second monitor or their phone. Paste the question, read the answer. For preparation it is the single best free tool available: break down the job description, rehearse answers to the standard questions, drill your phrasing until it stops sounding rehearsed.

In the interview itself, the mechanics work against you. It does not hear the call, so you have to type or dictate the question yourself. That means switching windows and hitting keys mid-sentence, and the rhythm of the conversation breaks the moment you look away. A prompter puts the answer on the screen you are already looking at. And the chat window is an ordinary window: when you share your screen, it is visible like anything else.

• Where it wins: free, no install, superb for everything you do before the call.
• Where it does not: it cannot hear the call, manual input breaks your pacing, and the window is plainly visible in a screen share.

If you are mostly preparing rather than looking for in-the-moment help, ChatGPT plus a written list of your own stories will take you further than any prompter.

Side-by-side

Two practical splits fall out of that table. First, if the interviewer may ask you to share your entire screen, a browser tab and a chat window are ordinary windows and an overlay is not - that is a mechanical difference, not a marketing one. Second, if you would rather not put a card on file, the paid list narrows to one option (Vizir's crypto payment) plus free ChatGPT. Longer head-to-head write-ups are in the alternatives section.

What "hidden overlay" actually means

Vendors in this space love the word invisible, so it is worth stating the mechanism. Hiding an overlay relies on the operating system excluding a specific window from screen capture. That works during browser screen sharing: Google Meet, web Zoom and Teams, and live coding pads like CoderPad. Every overlay in this category rests on that same operating-system feature, as far as each vendor describes it. How well it holds depends on your OS version and on what is doing the capturing, which is exactly why the qualifications below matter.

In native desktop clients on macOS 15 and later, and in local screen recorders such as QuickTime or OBS, the overlay can land in the capture. Vizir's answer is the phone companion; other vendors handle it differently, so read their documentation rather than their landing page.

And the part nobody should soften: against webcam proctoring - HackerRank Proctoring, Proctorio, Mettl - a hidden overlay is irrelevant. Those systems watch your gaze, your behavior and the processes running on your machine. If a test or exam is proctored, the sensible move is not to risk it at all. Any product promising a hundred percent invisibility is selling you copywriting, not a technical property.

Which one to pick

• You want help across the whole interview, on either OS, without putting a card on file. Vizir: overlay plus phone companion, screen capture for technical rounds, crypto payment, trial without a card.
• You want the most established product and price is not the constraint. Cluely is the mature option in this category, and it covers sales calls and meetings as well as interviews.
• Your loop is algorithms and nothing else. Interview Coder is excellent inside that box, and useless outside it.
• You mostly need to get ready, not to be prompted live. Final Round AI's mock interviews, or free ChatGPT.
• You are switching into tech and the gap is experience, not answers. Tools help at the margin; closing an experience gap is a different problem, and worth solving first.

Whichever you choose, run it once before it matters. Set up a fake call, share your screen the way the interviewer will ask you to, and watch what appears on the receiving side. Every tool here behaves slightly differently on your specific machine, and the interview is the wrong place to find out how.

And keep the distinction straight: a prompter is not an autopilot. It hands you a starting point. You are still the one answering.