Any student's screen on the projector, in seconds.
Roomzik runs on your Mac, or right in Chrome or Edge on any Windows or Mac laptop. Students open a link in their browser, or mirror from an iPhone, and you choose whose screen the room sees. Students install nothing.
The browser version is free and runs on Windows or Mac, with nothing to install. Web or Mac app?
Are you a student? Type the 4-digit room code from the projector to share your screen.
Three steps, and the class is on screen.
Open Roomzik and connect the projector
Set the projector up as a separate display. It shows your screen by default. The controls stay on your laptop, where only you can see them.
Students join with the room code
They scan the QR code on the projector or open roomzik.com/7990, type their name and press Share. iPhones use Screen Mirroring.
You choose what the room sees
Click a student to put them on the projector. Show one screen, two side by side, or four at once. Press Esc to go back to yours.
Start in your browser. Add the Mac app when you need more.
Both use the same room code, the same switchboard and the same projector view. Students join the same way.
In Chrome or Edge, on Windows or Mac
Free. Open roomzik.com/host and the room is ready.
- Laptops share from the browser, with the same Allow and Decline
- All six layouts, Instant or Preview & Take, the join code on the projector
- Your own screen on the projector. Share one window, like VS Code, to keep the controls out of view
- No iPhones or iPads: a browser can't receive AirPlay
- You open the projector window at the start of each class
For the Mac you teach from every week
Free download, macOS 13 or later.
- Everything in Roomzik Web
- iPhones, iPads and Macs mirror with AirPlay
- Your controls never appear on the projector, even when you share your whole screen
- The projector view opens full screen on its own
- A menu-bar icon shows who is waiting, and ⌥⌘R brings the controls back
Built for a room full of people and one projector.
Everything a trainer needs to show work from the room, and nothing that slows the lesson down.
Laptops join from the browser
Chrome, Edge or Safari, on Windows or Mac. Students share their entire screen, not only a tab. No app, no account.
iPhones, iPads and Macs via AirPlay
They pick Roomzik plus your room code (e.g. Roomzik 7990) in Screen Mirroring, the same way they would with an Apple TV. Several classrooms in one building never get mixed up.
Six layouts
One screen, side by side, picture in picture, a 2×2 grid, one big and two small, or three across.
You decide who shares
No screen reaches you until you press Allow. Students can raise a hand from the page. Or let everyone in automatically.
Works on difficult Wi-Fi
Video goes straight across the room's network. If the Wi-Fi keeps devices apart, as guest networks often do, Roomzik sends it through an encrypted relay on its own.
The controls stay off the projector
The switchboard never appears in what you share. The room sees your work, never the buttons. Show or hide it with ⌥⌘R.
The guide
Everything you need for your first session. It takes about five minutes to read.
1Install and first launch
- Download Roomzik and open the file. Drag Roomzik into Applications, then open it from there. macOS asks once whether to open an app downloaded from the internet: click Open.
- The first time, macOS asks for permission to record the screen. Roomzik needs it to show your screen on the projector. Open System Settings → Privacy & Security → Screen & System Audio Recording and turn on Roomzik.
- Quit Roomzik and open it again. macOS only applies the permission after a restart.
2Connect the projector as a separate display
Roomzik uses two screens: the projector shows what the room sees, and your laptop holds the controls. For that, the projector must be a separate display, not a mirror of your laptop.
- Plug in the projector.
- Open System Settings → Displays, select the projector, and set Use as to Extended display (not "Mirror for Built-in Display").
- Roomzik puts its stage full screen on the projector by itself. Until you choose someone, the stage shows your own laptop screen.
3Let students join with the room code
- Turn on Join code on projector in the top bar. A QR code, the link (like
roomzik.com/7990) and the room code slide over the projector. - Students scan the QR code or type the link, enter their name and press Share my screen.
- When the browser asks what to share, they choose Entire screen.
- Press Esc or turn the toggle off to hide the code again.
4Allow or decline
Each student who presses Share appears under Waiting to share. Nothing of their screen reaches you yet.
- Allow lets them in. Their screen appears under People as a small live preview.
- Decline sends them back. Their page tells them, and they can ask again.
- Turn on Allow everyone automatically when you know the room and want to skip this step.
Students can press Raise hand on their page. You see a ✋ on their tile and a count in the menu bar.
5Put screens on the projector
- Pick a layout on the right: Single, Side by side, Picture in picture, Grid 2×2, Big + two small, or Three across. Numbered slots appear in the preview.
- Click a slot to select it, then click a person to fill it. You can also drag a person onto a slot.
- The × on a slot empties it. Hover over a person for Show alone and Stop sharing.
Students see "You're LIVE on the projector" on their page while they're on. Turn on Show names on projector to label each screen with the student's name.
6Instant or Preview & Take
The switch in the top bar decides when your changes reach the projector.
Every click changes the projector straight away. Best for quick, informal sessions.
You build the next picture in Next while Live stays on the projector. Press Take or Space to switch. The room never sees you setting up.
7Keyboard shortcuts
You can also click the Roomzik icon in the menu bar to open the switchboard or show the join code.
8iPhones, iPads and Macs
Apple devices can mirror to Roomzik with AirPlay, with nothing to install.
- Open Control Center (on iPhone, swipe down from the top-right corner) and tap Screen Mirroring.
- Choose Roomzik with your room's code, e.g. Roomzik 7990. If someone is already using it, choose Roomzik 7990 · 2.
- The first time, the device asks for a code. It's the iPhone code in the switchboard's top bar, and it's also on the join card.
9Troubleshooting
Some Wi-Fi networks, especially guest networks, keep devices apart. Roomzik switches to its relay automatically, so check that the student is online and on the room's Wi-Fi. If it still fails, a different network (your own router, or a phone hotspot) fixes it.
The Wi-Fi keeps devices apart, so that screen travels through the internet instead of straight across the room. It works, with a little more delay. For the smoothest picture, use a network that lets devices reach each other.
They should click Allow. It lets the browser send the video straight across the room instead of through the relay.
The student picked a window instead of the whole screen. Ask them to press Stop sharing, share again and choose Entire screen.
It was set to "Use as Separate Display". In Screen Mirroring, choose Mirror Built-in Display.
The displays are mirrored. In System Settings → Displays, set the projector to Extended display. If "My screen" is black, turn on the Screen Recording permission (step 1) and restart Roomzik.
Questions trainers ask
Do students need to install anything?
No. Laptops use a web page in Chrome, Edge or Safari. iPhones, iPads and Macs use Screen Mirroring, which is already built in. Only the trainer installs Roomzik.
Which devices can share?
Windows and Mac laptops from the browser (Chrome or Edge work best; Safari works too). iPhones, iPads and Macs through AirPlay. Android phones can't share their screen from a browser yet, so Android users should share from a laptop.
How many students can join?
The whole class can join and appear in your list at once. The projector shows up to four screens at a time, depending on the layout. Two iPhones or iPads can mirror at the same time.
Where does the video go? Is it recorded?
Nothing is recorded. When the Wi-Fi allows it, video goes straight from the student's device to your Mac and never leaves the room. When the network keeps devices apart, it passes through an encrypted relay. The roomzik.com server only introduces the devices to each other.
Does it need internet?
Yes, for the join page and for connecting students. The video itself stays on the room's Wi-Fi whenever the network allows it.
Is sound shared?
No. Roomzik shares the picture only, so a dozen laptops never play over each other.
Can students see each other's screens?
Only what you put on the projector. Each student's page shows their own screen and whether they're live.
Can the trainer use Windows?
Yes. Open roomzik.com/host in Chrome or Edge: that's Roomzik Web, free and with nothing to install. It does everything except receive iPhones and iPads, which needs the Mac app.
Your next class, on the big screen.
Install Roomzik on the Mac you teach from. Your students only need the room code.