You know that split-second dread when you share your screen and a Slack notification pops up right over your demo? Or when you frantically Alt-Tab, praying the client didn’t catch a glimpse of your messy Finder window?
That feeling isn’t just awkward. It’s a slow leak of your confidence. Every presenter on macOS has felt it — the impossible choice between sharing a single locked window (and looking stiff) or sharing your whole desktop (and risking exposure).
There is a third way. And it’s not a virtual desktop.
Aria, a developer who lives in customer demos, hit this wall. She built Sel: a tool that lets you cherry-pick the windows you want to show, composite them into one clean canvas, and share that — not your desktop, not a single app. No notifications, no stray clients, no background clutter.
Let me be blunt: virtual desktops are a Band-Aid for a broken workflow. You still have to manually drag windows around, remember which Space contains what, and pray you don’t accidentally swipe to the wrong one mid-demo. It adds cognitive load at a moment when your brain is already maxed out on keeping the narrative straight.
Sel flips the script: you don’t manage your screen; you compose a scene.
Pick your demo windows. Arrange them. Add a webcam bubble or a background. Save it as a named scene (“Demo”, “Code”, “Browser”). Then switch scenes live during the call with a smooth transition. That’s it. The rest of your desktop doesn’t exist to the viewer.
The real insight? This isn’t just about privacy — it’s about flow. When you pre-compose your scenes before the call, you stop being a window manager and start being a storyteller. The anxiety of “did I leave that client spreadsheet open?” evaporates. You trust the tool, so you can focus on what matters: the conversation.
Most people miss that the real value isn’t hiding notifications — it’s the ability to focus on your narrative without the mental tax of window juggling.
Aria saw this firsthand: “I do a lot of live demos for customers, and I kept being nervous about what else was on my screen. Sharing one window is safer but then I’ll be stuck with one window. So I built Sel.” That’s the voice of someone who felt the pain, not some abstract design principle.
So why is this not standard? Because we’ve been trained to think of screen sharing as either “share everything” or “share one app.” Sel breaks that binary. It’s the first tool that says: share exactly what you want, as a unified canvas, and nothing else.
Here’s the test: if you’ve ever used a virtual desktop to “clean up” for a demo, you’re working too hard. Sel eliminates that prep step. You just define your scenes once, and you’re ready for any meeting.
The best demos look effortless because the presenter isn’t fighting their own computer. Sel makes that possible.
Is it perfect? It’s early — it uses ScreenCaptureKit and Metal, so it’s macOS only for now. But the principle is universal: separate what you show from what you see. That idea could reshape how we think about screen sharing entirely.
Stop faking it with virtual desktops. Start composing scenes. Your confidence — and your demos — will thank you.
FAQ
Q: Why not just use a virtual desktop?
A: Virtual desktops require manual setup during a call, and you can still accidentally swipe to the wrong Space. Sel pre-composes windows into a single canvas — no risk, no extra clicks.
Q: How does this improve my actual workflow?
A: You define scenes (demo, code, etc.) before the call, then switch live with one click. It removes the mental overhead of window management, letting you focus entirely on the conversation.
Q: Isn't this overengineering for something as simple as sharing a screen?
A: If you only share one window, sure. But if you regularly switch between multiple apps during demos, the friction and anxiety are real. Sel simplifies that friction — it's not overengineering; it's designing for human attention.