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An AI assistant on your phone, with nothing on your shared screen — and nothing we can read
When you share your screen, everything on it becomes part of the meeting. That includes an assistant’s answer window, a notification sliding in from the corner, and the sound it makes when it arrives. If you are walking a client through a demo, or your slides fill the screen, your own notes belong somewhere else.
Arguium 1.4.7 adds Phone Mirror. It shows Arguium’s live transcript and answers on your phone, in an encrypted web page, so you can keep your shared screen clean. Phone Mirror is not screen mirroring: nothing from your computer’s screen is sent to the phone. The page shows Arguium’s own panels and nothing else.
Where it helps
- Sales calls. You share the demo. Arguium listens to the call and drafts an answer to the pricing question or the objection, and you read it on the phone next to your keyboard.
- Presentations. Your slides stay full screen. When a question comes in, the answer appears on the phone, not over your slides.
- Client meetings and stand-ups. Someone shares a spreadsheet. From the phone, you take a screenshot of it and send it to Arguium for analysis, without touching the computer.
- Interviews, where the rules allow outside tools.
How pairing works
On your computer, open Settings, find Phone Mirror under General, and click Connect phone. Arguium shows a QR code. Point your phone’s camera at it and mirror.arguium.com opens in the phone’s browser. There is no app to install and nothing to sign in to on the phone.
The phone and the computer do not need to share a network. Your laptop can be on office Wi-Fi while your phone is on cellular: both connect out to Arguium’s relay, which passes data between them. There is nothing to open on your local network.
The code works once, and only for 2 minutes. The first phone to scan it owns the pairing, and any other phone is refused. If your phone ever says the code was already used, someone else got there first: click Disconnect on the computer and get a new code. Settings also reminds you not to show the code while you share your screen. The next section explains why that matters.
What "nothing we can read" means
The relay is our server, and every message passes through it. So the useful question is what the relay can see.
For each pairing, your computer creates a new random 256-bit key and puts it in the QR code, in the part of the link after the # sign. Browsers keep that part, the fragment, to themselves: it is never sent to any server. The phone reads the key from it. The relay never receives it.
Before anything leaves your computer, Arguium encrypts it with that key (AES-256-GCM). The relay receives bytes it cannot decrypt and forwards them to the phone, which decrypts them. To check who may join a pairing, the relay stores only hashes of the one-time codes, not the codes themselves. It can tell that a phone is connected. It cannot read the transcript or the answers.
Two things this does not change. First, Arguium’s AI features work as before: to produce an answer, the transcript or screenshot still goes to an AI provider. The end-to-end encryption covers the link between your computer and your phone. Second, the phone page is code we serve, so you trust that page the way you trust any web app. It loads no third-party scripts and runs under a strict content security policy. The security and privacy page has the details.
What the phone shows
- The live transcript, labelled "You" and "Them", and voice answers as they stream in.
- Screenshot analyses and typed chat answers, with their web sources. The screenshots themselves stay on the computer: the phone only shows how many a question carried.
- An adjustable text size, a Jump to latest button when you have scrolled up, and Keep screen on, which is on by default.
- On a tablet or a second laptop, the two feeds sit side by side: voice on the left, screenshots and chat on the right.
While a phone is connected, voice answers stop popping up on the computer’s screen.
Controls, once you allow them
A new pairing is view-only. To let the phone act on your computer, click Allow control in Settings. The phone in your hand then shows its controls. That is how you know the paired phone is yours: if the controls do not appear on it, disconnect.
With control allowed, you can do this from the phone:
- Start and stop listening.
- Ask for an answer now, or for a line Arguium chose to skip.
- Take a screenshot of the computer, and send the screenshot queue for analysis.
- Type a question.
- Hide Arguium on the computer.
Phone mode
Hide Arguium on this screen (a switch in Settings, or Hide on computer on the phone) hides Arguium’s windows on your computer: the overlay, chat, answers and pop-ups. It also silences Arguium’s sounds and system notifications, and the REC indicator in the Mac menu bar. If stealth mode is on, one small button stays on screen to bring Arguium back, because stealth mode has no tray icon.
Phone mode ends only when you turn it off: from the phone, in Settings, or with a keyboard shortcut. It never ends because the phone lost its connection. If your phone’s battery dies halfway through a presentation, Arguium does not reappear on the screen you are sharing.
Remember this phone
By default, a pairing ends when you quit Arguium, and you scan a new code next time. If you use the same phone every day, tick Remember this phone before you scan. The phone then reconnects by itself for up to 30 days, even after Arguium restarts: open mirror.arguium.com again and it picks up where it left off. The computer keeps the pairing in its encrypted store. Forget this phone in Settings ends it at any time, and so does signing out.
The limits
- Premium only. Phone Mirror is part of the Premium plan.
- No forward secrecy. The key in the QR code is the key for the whole pairing: until you quit Arguium, or up to 30 days for a remembered phone. Someone who photographed your QR code and also captured the relay’s traffic could decrypt that pairing. Treat the QR code like a password: never show it on a shared screen, and if you think someone saw it, click Disconnect (or Forget this phone) and pair again.
- First scan wins. If someone else scans your code within its 2 minutes and before you do, they can read the mirror. They cannot control your computer, because that needs your Allow control. Your own phone will tell you the code was already used.
- It needs a connection. Both devices reach the relay over the internet. If the computer drops off, the phone says so and catches up when it is back.
Try it
Phone Mirror is in Arguium 1.4.7. The Phone Mirror page has the short version, and the security page explains what goes where.
Use Arguium only where external tools are allowed.