Share a screen, not your screen.
Alterscreen adds a second screen to your Mac, made for calls. Put the apps you choose on it and share it in Zoom, Meet or Teams. Your messages, notifications and desktop stay backstage.
Free for 7 days, then $21.99 for a single license. For macOS 14 or later.
Works with every meeting app
- Zoom
- Google Meet
- Microsoft Teams
- Slack
- Webex
- FaceTime
- Discord
- GoTo Meeting
- Jitsi Meet
And any other app that can share a screen or a window.
Sharing your screen shares everything.
One notification, one open tab, one glimpse of your inbox. And on a big monitor, people on laptops can't read a thing.
Messages pop up mid-demo
A notification lands on top of your slides, in front of everyone in the call.
Your whole desktop is on show
Open tabs, your inbox, files on your desktop: whatever sits behind the window you meant to share.
Big screens shrink to nothing
Share a 5K or ultrawide display, and your audience squints at text the size of a footnote.
Give your call its own screen.
Alterscreen makes a separate screen that shows only what you put on it. You work on it from a window on your own screen, and your call shares it.
1Choose the apps
Switch on the apps that may appear, like Keynote, Figma or your browser. Nothing else is ever drawn.
2Put windows on it
Drag a window into the Alterscreen window, or press ⌃⌥S. Windows are tiled for you, and go home when you're done.
3Share the screen named Alterscreen
Pick it in your call app's share menu. Everyone sees exactly what's in the Alterscreen window.
Only what you allow. Not even for a frame.
Alterscreen draws only the apps you've allowed. Other windows, notifications, the menu bar and the Dock are never part of the picture, so there's nothing to hide in a hurry.
- Windows of other apps that land on it are moved straight off
- Every session starts with a blank screen
- The hidden screen behind it shows call apps a "Don't share this screen" card, in case you pick the wrong one
Draw, point and zoom, live.
Everything you need to walk people through a screen, on a toolbar only you can see.
- Pen, highlighter, arrows and a whiteboard
- Laser pointer, spotlight and ripples where you click
- Zoom to a window, pinch or pan, sharp up to 2×
Sized for the people watching.
Set Alterscreen to 1080p for a call, 4:3 for an old projector or portrait for phones, and change it while you're live. Your windows stay put.
- 720p to 4K, 16:10, 4:3, square and portrait
- Shapes for phones, tablets, laptops and projectors
- Rotate in one click, or set any size you like
Small things, handled.
One window, full size
⌃⌥F makes the focused window fill Alterscreen, sending it there first if it isn't on it yet.
Windows go home
Stop sharing and every window goes back exactly where it was before.
Drag and drop
Drop a window on the Alterscreen window to put it on. Alterscreen asks before it shows a new app.
Keyboard first
Every tool has a ⌃⌥ shortcut, so you never have to look away from the conversation.
Your background
A colour or a picture behind your windows, instead of your desktop and its wallpaper.
Sharp in the call
Alterscreen is drawn at twice its size, so text stays crisp, even zoomed in.
Runs on your Mac. Stays on your Mac.
Alterscreen has no account, no servers and no analytics. It never records what's on your screen, and never sends it anywhere.
Nothing leaves your Mac
Your call app does the sharing. Alterscreen only puts the picture together, on your Mac.
Two permissions, for clear reasons
Screen Recording to draw Alterscreen, and Accessibility to move windows on and off it.
No account
Download it, open it, share. There's nothing to sign up for.
One price. No subscription.
Try every feature free for 7 days. Then buy Alterscreen once and it's yours. Bringing it to a whole team? Let's talk.
Single license
$21.99
One-time purchase
- Every feature
- A license key, emailed to you
- Use it on all your own Macs
- No account, nothing to sign up for
Teams and enterprise
Let's talk
Licenses for your whole company
- As many licenses as you need
- One invoice for your company
- Help rolling it out to your team
Prices in US dollars.
Questions, answered.
Which call apps does it work with?
All of them: Zoom, Google Meet, Microsoft Teams, Slack, Webex, FaceTime, Discord, GoTo Meeting, Jitsi Meet, and any other app that can share a screen. In the app's share menu, pick the screen named Alterscreen. You can also share the Alterscreen window itself.
What do people see if a notification comes in?
Nothing. Alterscreen draws only the apps you've allowed, so notifications, alerts and other apps' windows never appear on it, not even for a moment.
Can I still use the apps that are on Alterscreen?
Yes. Move the pointer into the Alterscreen window, then click, type and scroll as usual. Push against an edge to come back out.
Does it share sound?
Not yet. Your call app can still share your Mac's sound along with the screen.
Why does it need Screen Recording and Accessibility?
Screen Recording lets Alterscreen draw its screen from the windows on it. Accessibility lets it move windows onto Alterscreen and back again.
Nothing is recorded, saved or sent anywhere.
Why isn't it on the Mac App Store?
Alterscreen creates a screen of its own, which needs parts of macOS the App Store doesn't allow. You download it from this site instead.
How much does it cost?
$21.99 for a single license, bought once. For a team or a whole company, contact us and we'll put together licenses for everyone.
Can I try it first?
Yes. Every feature works free for 7 days, with nothing to sign up for. After that, Alterscreen asks for a license key before it starts.
I lost my license key
Get it emailed to you again, using the email you bought Alterscreen with.
Which Macs does it run on?
Macs with macOS 14 Sonoma or later.
Curtain up on your next call.
Try it free for 7 days and give your next screen share a screen of its own.