Spacedesk Alternatives

Best for: Control multiple Windows PCs with one keyboard and mouse

Mouse without Borders is a Microsoft Garage and PowerToys feature for controlling up to four Windows computers with one keyboard and mouse. It can also support clipboard and file movement between trusted PCs. It is useful beside Spacedesk, but it is not a second-monitor tool and does not turn a tablet into an extended display.

Pricing: Available through Microsoft PowerToys; verify current Microsoft distribution and requirements.

Best for: Share one mouse and keyboard across Windows and Mac computers

ShareMouse is a software KVM tool for sharing one mouse and keyboard across multiple Windows and Mac computers. It is closer to Mouse without Borders than Spacedesk: it controls separate computers rather than creating an extra monitor from a tablet. Consider it when input sharing is the goal.

Pricing: A free edition and paid licenses are offered; verify current freeware and commercial-use rules.

Best for: Windows-only software KVM for keyboard and mouse sharing

Input Director lets one Windows computer control other Windows systems with the same keyboard and mouse. It is a practical option for multi-PC desks, but it does not stream a monitor or extend the desktop to a tablet. Compare it only for keyboard, mouse, clipboard, and network control workflows.

Pricing: Free for personal at-home non-commercial use; commercial licensing requires contacting the developer.

Best for: Use tablets and other devices as second displays for Mac or PC

Duet Display is one of the closest Spacedesk alternatives for turning an iPad, Mac, PC, or Android device into an extra display. It supports wired and wireless workflows depending on the plan and device combination. It is more commercial than Spacedesk, so confirm current subscription, platform, and feature details.

Pricing: Duet uses paid plans and in-app purchases; check current plan names and device support before buying.

Best for: Use iOS or Android devices as extra displays for Mac or Windows

iDisplay is a second-screen app that aims to turn iOS or Android devices into an extra display for a Mac or Windows computer over USB or Wi-Fi. It is relevant to Spacedesk users who want a tablet monitor, but its current compatibility and support status should be checked carefully before recommending it.

Pricing: Current store pricing and desktop-host requirements should be verified before publishing.

Best for: Legacy wireless or wired second-display app

Air Display is a legacy Avatron second-display app associated with using iPads, Macs, or other devices as extra screens. Current official product availability is difficult to verify from active Avatron pages, so this item should be treated as low-confidence or historical unless the admin confirms a live store listing.

Pricing: Current pricing could not be confidently verified from an active official product page.

Best for: Open-source keyboard and mouse sharing across computers

Barrier is an open-source software KVM for sharing a keyboard and mouse across multiple computers, with clipboard sharing. It is not a display-extension tool, and its own project discussions point users toward Input Leap because Barrier is effectively unmaintained. Keep it only as a legacy KVM option.

Pricing: Free open-source software; no paid pricing was found on the official repository.

Best for: Control multiple Windows PCs from one keyboard and mouse

Multiplicity by Stardock is a software KVM for controlling multiple Windows PCs with one keyboard and mouse. Some editions add broader KVM-style features, but it is not primarily a tablet-as-monitor product. Compare it when users need reliable Windows-to-Windows control rather than an extra display.

Pricing: Paid Stardock software; verify current edition names, device limits, and pricing on the official site.

Best for: Legacy network display extension for older Windows setups

ZoneScreen is an older tool for extending a desktop to network-connected computers or portable devices. It is conceptually close to Spacedesk, but the product appears dated and tied to older Windows-era display-driver assumptions. Treat it as a legacy reference, not a first-choice modern recommendation.

Pricing: Listed as free in legacy directories; current support and licensing should be manually verified.

Best for: Legacy X11-to-VNC keyboard and mouse control

x2vnc is a legacy X11 and VNC-based utility for controlling a second machine as if its display sat beside the main screen. It is not a modern virtual monitor or tablet display system. It may still be useful as historical context for software KVM workflows, but current compatibility is limited.

Pricing: No current paid pricing was found; treat as legacy free software.

Best for: Legacy Android keyboard and mouse sharing

ShareKM was an Android-focused keyboard and mouse sharing app, but a reliable current official site or app-store listing could not be verified. Existing references point to old APK mirrors and forum posts. It should be removed or kept disabled unless an official maintained source is confirmed.

Pricing: Current pricing and official availability could not be verified.

Best for: Legacy VNC-based keyboard and mouse sharing

Win2VNC is a legacy tool for moving a mouse and keyboard between two computers as though their screens were side by side. It works through VNC concepts and does not create an additional monitor. It should be treated as an old software KVM-style utility, not a direct Spacedesk replacement.

Pricing: No current paid pricing was found on the SourceForge project page.

Best for: Tablet as USB monitor for a computer

TwomonUSB appears to be represented today by the newer Twomon SE product line from Easy&Light, which turns a tablet into a portable USB monitor for a PC. It is relevant as a wired second-screen alternative to Spacedesk, but the exact legacy TwomonUSB listing should be reviewed and possibly renamed.

Pricing: Current app-store pricing should be verified by region before publishing.

Best for: Bluetooth keyboard and mouse sharing across devices

across turns a Bluetooth-equipped Windows PC or Mac into a keyboard and mouse controller for nearby devices such as computers, phones, and tablets. It is useful for multi-device input control, but it does not extend a Windows desktop or provide a second screen like Spacedesk.

Pricing: Commercial licensing appears to apply; verify current pricing and platform editions on the official site.

Best for: Wired tablet or phone as second monitor for Mac or Windows

Splashtop Wired XDisplay turns an iPad, Android tablet, Kindle, or smartphone into an extra monitor for a Mac or Windows computer over a wired connection. It is a direct Spacedesk alternative when users prefer cable stability over wireless LAN setup, especially for portable tablet monitor use.

Pricing: Check current app-store pricing, trial limits, and desktop-agent requirements before publishing.

Best for: Android device as a wired Windows second monitor

SuperDisplay turns an Android phone or tablet into a portable USB display for a Windows PC, with duplicate or extend modes and support for touch and pen workflows. It is one of the more direct Spacedesk alternatives for Android tablet owners who prefer a wired setup.

Pricing: The app offers a trial-style evaluation; verify current Play Store pricing and driver version.

Best for: Hardware-assisted second display for iPad, Mac, and PC setups

Luna Display is a hardware-assisted second-display system from Astropad. It can turn an iPad or Mac into a second display for Mac or PC, depending on the mode and adapter. It suits users who prefer a dedicated dongle and Apple-friendly workflows over a pure software network driver.

Pricing: Requires Luna hardware; verify current adapter type, price, and device compatibility.

Best for: Share a screen or app window to any browser device

Deskreen is an open-source desktop app that shares a computer screen or selected application window to any device with a web browser over Wi-Fi. It is closer to screen sharing than a full virtual monitor in many setups, but it is useful for browser-based secondary screens.

Pricing: Community Edition is open source; verify current Pro or donation options if mentioned.

Best for: Use an iPad as a built-in second display for Mac

Apple Sidecar is a built-in macOS and iPadOS feature that lets a compatible iPad extend or mirror a Mac desktop. It is not a Windows alternative to Spacedesk, but it is often the simplest option for Mac users who already own a supported iPad.

Pricing: Included with compatible Apple devices and operating systems; hardware requirements still apply.

Best for: Share one mouse and keyboard across multiple computers

Synergy shares one mouse and keyboard across multiple computers and operating systems. It is not a second-display utility, but it is a better-known commercial alternative to Barrier and a useful addition for users comparing the software KVM side of the current list.

Pricing: Paid software; verify current license, editions, and support terms on Symless.

Best for: Maintained open-source software KVM for keyboard and mouse sharing

Input Leap is an open-source software KVM and an active fork of Barrier. It lets users share one keyboard and mouse across computers, but it does not create a tablet monitor. Add it if the page keeps software KVM tools as related alternatives.

Pricing: Free open-source software; no paid pricing was found on the official repository.