Sees your screen
One key captures whatever you're looking at and sends it with your question. The overlay is excluded from that capture too, so the model never sees itself.
The prompter they can't see
Souffleur is a free, open-source AI assistant that reads your screen and listens to your call from a small window sitting on top of everything you do — and absent from the Zoom, Meet or Teams screen share everyone else is watching.
Free and open source. No API key needed to start, or use your own. See how it compares to Cluely →
async function handler(req) {
const rows = await db.query(sql);
return rows.map(toDto);
}
const rows = await db.query(sql);
return rows.map(toDto);
}
async function handler(req) {
const rows = await db.query(sql);
return rows.map(toDto);
}
const rows = await db.query(sql);
return rows.map(toDto);
}
nothing here
Measured, not claimed
Every tool in this category says it is invisible. Apple's own developer forums say the flag they all depend on stopped working, with an Apple engineer stating there is no public API for preventing screen capture.
So it was tested instead of assumed. Three windows — one protected, one
excluded by filter, one unprotected control — captured through a live
30 fps SCStream, the same ScreenCaptureKit path Zoom,
Meet, Teams and OBS use.
The control is the point. Without a window that should appear, “nothing was captured” proves nothing.
control, unprotected
100%
captured in every frame
sharingType = .none
0%
hidden in all 151 frames
excludingWindows
0%
hidden in all 151 frames
Method and caveats
What it does
Hears the call
System audio — the other person's voice, not yours — is transcribed as they speak and dropped straight into the chat box, so answering is one keystroke. Split at pauses, never mid-word.
Answers as you
Add your CV and interview mode answers in the first person from your real history — and is told not to invent employers, dates or numbers that aren't in it.
Free key, or yours
Start on the free key with nothing to set up, or bring Gemini, OpenAI or any OpenAI-compatible endpoint. Your own key is encrypted in the system keychain and talks to that provider directly, with no server of ours in between.
Download
Free. Sign up once to download. No API key needed to start, or bring one from whichever provider you prefer. Version v0.1.4
macOS
1
Install Homebrew — skip if you already have it
what is this?
2
Install Souffleur
Paste each into Terminal. The app installs and opens with nothing to click through. Downloading a disk image instead means macOS refuses to open it until you approve the app by hand in System Settings, because the build is not notarised by Apple.
New to Homebrew? It is the standard package manager for macOS —
brew.sh ·
documentation ·
FAQ.
Would rather have the file? The
disk image is on the releases page,
with the approval steps.
Sign up to download
One click with Google. The app itself never asks you to sign in, and there is nothing to pay for.
Signed in
Downloads are unlocked, and you will get an email when a new version ships.
On macOS, grant Screen Recording in System Settings → Privacy & Security after installing. Without it the overlay runs but cannot see your screen or hear the call.
Everything works on both. Call audio is captured through ScreenCaptureKit on macOS and Chromium's loopback support on Windows; the rest of the pipeline is shared.
Report
This counts people who chose to sign in. The installers are also on the public releases page, which needs no account, so read these as a floor rather than a total.
Questions people actually ask
Is Souffleur really invisible during a screen share?
It was measured rather than assumed. Three windows — one protected, one excluded by capture filter, one unprotected control — were captured through a live 30 fps ScreenCaptureKit stream, the same path Zoom, Google Meet, Teams and OBS use. The control appeared in 100% of frames. Both protected windows appeared in none of the 151. The control is what makes the result mean anything — the method is written up in full.
Is it free?
Yes. Free and open source, no account and no subscription. It starts on a free key Souffleur provides, up to a daily limit. Past that, you connect your own Gemini or OpenAI key and pay the provider directly — for most people that is cents per interview rather than a monthly bill.
Is this a free alternative to Cluely?
It does the same job. Cluely puts screen-share invisibility in its Pro + Undetectability plan at $149.99 a month; Souffleur is free, open source, and publishes the capture test behind its invisibility claim so you can check it instead of trusting it. The full comparison is here.
Does it work on Windows as well as macOS?
Yes, with the same features on both. Call audio is captured through
ScreenCaptureKit on macOS and Chromium's loopback support on Windows; the
overlay, screen capture, chat and interview mode are shared code. macOS
installs through Homebrew, Windows through a .exe installer.
Can an interviewer detect it some other way?
Yes. Hiding a window from screen capture is not the same as being undetectable. A camera pointed at your screen, a second machine recording the room, a proctoring agent with kernel-level access, or simply your eyes moving to read will all still show something. The window is excluded from the capture stream, and that is the whole of the claim.
Does it send my screen or my API key anywhere?
With your own key, requests go from your machine straight to that provider, and the key itself is encrypted by the operating system keychain. Without one, the free key answers: requests pass through Souffleur's server to Google Gemini, which adds our key there. The server logs nothing you send and keeps only a daily count per install, under a hashed id. Downloading from this site asks you to sign in with Google, which records your name and email address and nothing else. The app itself never asks you to sign in.