Presence systems for households Fig. 1: The signal Riga Computing Company

Know before
you knock.

Doorby shows the people you live with when you're on a call: one glanceable dot on their phone, home screen, or lock screen. So they know when it is safe to walk in.

IPHONE · MAC · WINDOWS · NO EMAILS, NO MEETING DATA, NO IT TICKETS.

COMPANION IN THE MENU BAR / TRAY. DETECTS THE MIC IN USE. ANY APP. A. YOUR WORK COMPUTER "CALL" / "FREE" ONE BOOLEAN. NOTHING ELSE. THE WIDGET: ONE PERSON, LIVE. ON A CALL: WAIT FREE: WALK IN B. THEIR PHONE

FIG. 1. The signal path. A hot microphone is detected on the work computer; one boolean travels; a dot changes on their lock screen.

SEC. 01Audience

For the people who share your life,
not your org chart.

Teams and Zoom know you're on a call, but only your colleagues can see it. The people who actually walk into the room are exactly the ones locked out.

01 / PARTNER

Your partner

Working from the same flat, guessing from the tone of your voice whether it's a call or a podcast. Now it's one glance at the lock screen.

02 / PARENTS

Your parents

“Is now a good time to call?” answered before the phone rings. Green means yes, red means later.

03 / FLATMATES

Your flatmates

No more freezing mid-hallway with a laundry basket. The kitchen run can wait ninety seconds, if you know to wait.

SEC. 02Operating principle

One signal, done properly.

Your work computer checks whether its microphone is in use, the one thing every call has in common. No calendar access, no company account, nothing your employer needs to approve.

Red means a microphone is hot right now.

That's the whole product. It works with Teams, Zoom, Slack, FaceTime, anything at all, and even catches muted, listen-only calls, because the mic stays open.

STEP 2.1

Get the phone app

Create an account with just a name. No email, no password. Place the widget on your home or lock screen.

STEP 2.2

Pair your work computer

A small companion lives in the Mac menu bar or Windows tray. Enter a one-time pairing code from your phone and it starts reporting.

STEP 2.3

Invite your person

Send an invite code to your partner, parent, or flatmate. You choose the direction: they see you, you see them, or both.

SEC. 03Privacy

One boolean ever leaves your machine.

Privacy isn't a settings page here; it is the architecture. The companion sends call or free plus a timestamp. That's the entire payload.

3.1 · PAYLOAD

No content, ever

No audio, no meeting titles, no participant lists, no app names. The signal is a single yes/no; there is nothing else to leak.

3.2 · CONSENT

You choose who sees what

Sharing is per person, each direction its own decision. Pause any person, or everyone, with one tap.

3.3 · DENIABILITY

Paused looks like offline

Nobody can tell “hidden from me” apart from “laptop is asleep”. Pausing never tells on you.

3.4 · REVOCATION

A real kill switch

Every device has its own revocable token. Remove a device from your phone and its reporter permanently stops itself.

Notice to IT departments The companion needs no admin rights, no Teams or tenant integration, and no microphone permission. It makes outgoing HTTPS requests carrying one boolean, and uninstalls cleanly. The full technical notes, including how detection works on each platform, are on one page: read the IT notes →
SEC. 04Distribution

Get Doorby.

The phone app is where you see people; the desktop companions are what report your status. Most households want the iPhone app plus one companion per work computer. Setup details live in the manual.

iPhone

FORTHCOMING

The main app: live status feed, invites, device pairing, and home & lock-screen widgets with near-real-time updates.

Join the TestFlight

Mac

FORTHCOMING

A menu-bar app, never in the Dock. Shows your chosen person's live status and reports your own. Sandboxed, no mic permission needed.

Join the TestFlight

Windows

FORTHCOMING

A tray app with the same idea: your person's dot in the tray, a toast when their call starts or ends. No admin rights required.

Download
Appendix A · Physical systems

In the laboratory: an e-paper door sign and a HomeKit bridge, so the dot can live on your actual door, or turn a hallway lamp red.