DeskPad – A virtual monitor for screen sharing

Original Article ↗ Hacker News Discussion ↗

Screen-sharing from ultrawide or 4K monitors often leaves meeting participants squinting at tiny text or awkwardly cropped views, so developers are embracing tools like DeskPad, a macOS app that creates a low‑resolution virtual display inside a window for cleaner, more legible sharing. Commenters compare it to existing workflows on Windows and Linux (RegionToShare, OBS, Xephyr, virtual outputs, VNC-in-xvfb), debate trade‑offs like complexity vs. simplicity and open‑source vs. paid tools, and share practical tricks such as using virtual displays, scaling, and accessibility zoom to improve readability without constantly changing system resolution.

Overall reception

  • Strongly positive response, especially from users with ultrawide or 4K monitors and frequent screen‑sharing.
  • Seen as a “genius” quality-of-life tool that solves a long-standing annoyance, especially with tools like MS Teams that lack “share region” features.
  • Several plan to adopt it immediately for work, teaching, and pairing.

Primary use cases

  • Sharing a readable portion of a very large or high‑DPI display without constantly changing system resolution.
  • Keeping a dedicated “sandbox” area for meetings while preserving the main desktop layout.
  • Avoiding accidental exposure of notifications or unrelated windows.
  • Using a lower‑resolution virtual screen (e.g., 1080p) so viewers on laptops can see code, spreadsheets, or SAP screens clearly.

Alternatives and cross‑platform solutions

  • Windows: RegionToShare, FancyZones in PowerToys, virtual display drivers, VMs/remote desktop, OBS with virtual camera or projector windows.
  • Linux/X11: Xephyr/Xnest, xrandr --setmonitor, xvfb + VNC, VLC + slop, nested compositors; on Wayland: headless outputs plus mirroring (sway, Hyprland), pipewire screencast, xdg-desktop-portal hooks.
  • macOS: BetterDisplay (paid, more features), Screegle, OBS projectors, system accessibility zoom, RDM for resolutions.
  • Some note that OBS is very powerful but can be overkill or confusing; DeskPad is praised for simplicity and being free/open.

Screen-sharing UX & readability

  • Common complaint: viewers on small screens can’t read content from large/HiDPI displays, especially in Teams.
  • Suggestions include:
    • Using a low-res virtual monitor via DeskPad and sharing only that.
    • Not maximizing shared windows; keeping them smaller for better scaling.
    • Letting presenters control viewport instead of asking viewers to zoom.
  • Debate around window-sharing UX: some find it manageable; others say it’s clumsy and slow to switch between multiple windows.

Implementation, limitations & concerns

  • Uses private macOS APIs for virtual displays; questions about how these APIs were discovered and Apple’s stance on their use outside the App Store.
  • macOS shows a persistent “screen recording” indicator, which some find annoying but accept as unavoidable.
  • macOS-only nature is noted; multiple people discuss how Linux has had similar capabilities for years, though often with more complex tooling.
  • Some Intel/legacy Mac users worry about performance and OS support longevity.