Synergy carved out a specific niche years ago: software for sharing a single keyboard and mouse across multiple computers, letting you move the cursor from one screen to the next as though the machines were one continuous desktop. It’s still capable software, but the multi-device landscape has shifted considerably since Synergy first built its reputation. Operating system vendors have started baking similar functionality directly into their platforms, dedicated peripheral makers have built proprietary versions tuned for their own hardware, and a wave of open-source forks emerged specifically because Synergy’s licensing and update cadence frustrated its own user base. In 2026, picking the right multi-device control tool depends less on raw feature comparison and more on what ecosystem you’re actually working within.

Top Synergy Alternatives in 2026

1. Barrier

Barrier began life as a direct open-source fork of an older Synergy version, created specifically by developers frustrated with Synergy’s shift toward a more restrictive commercial license. It preserves the core cross-platform functionality, Windows, macOS, and Linux machines sharing one keyboard and mouse, while remaining completely free and openly developed. Active community maintenance means bug fixes and compatibility updates for new operating system releases tend to arrive faster than users might expect from a volunteer-run project.

Pros: Genuinely free with no licensing catch, cross-platform support matching Synergy’s original scope, active open-source development community.

Cons: Initial setup requires manually configuring network connections between machines, and there’s no official support line if something breaks.

Best for: Users wanting a free, actively maintained Synergy alternative with the same core functionality.

2. Mouse Without Borders (Microsoft)

Mouse Without Borders is a genuinely underrated tool from Microsoft’s Garage program, built by a Microsoft engineer as a passion project that eventually became an officially supported download. Setup takes a few minutes: install on each Windows PC, generate a security code on one machine, and enter it on the others to link them. Beyond cursor and keyboard sharing, it supports dragging files directly between linked computers and syncing clipboard content, which covers most of what people actually want from a multi-device setup without any subscription or account requirement.

Pros: Completely free from Microsoft, fast and simple setup, file drag-and-drop between PCs, clipboard sharing built in.

Cons: Windows-only, so it’s not an option for anyone running a Mac or Linux machine in the mix.

Best for: Windows users running multiple PCs who want the simplest possible setup.

3. Logitech Flow

Logitech Flow works specifically with Logitech’s own multi-device mice and keyboards, like the MX Master and MX Keys lines, and the tight hardware integration shows in how seamless the switching feels. Move the cursor to the edge of one screen and it appears instantly on the paired computer, with clipboard content and even file transfer support depending on the specific hardware pairing. The catch is obvious: it only works with Logitech’s own peripherals, so it’s not a general solution unless you’re already invested in that ecosystem.

Pros: Extremely seamless switching when paired with supported hardware, file transfer support, no separate account or subscription needed.

Cons: Requires specific Logitech hardware, and device support is more limited than software-only alternatives.

Best for: Logitech peripheral owners with multiple computers who want the smoothest possible switching experience.

4. Universal Control (Apple)

Apple built Universal Control directly into macOS and iPadOS, and for anyone fully inside the Apple ecosystem, it’s arguably the best implementation of this category of software that exists. No setup beyond having both devices signed into the same Apple ID and near each other on the same network, and dragging a file from a Mac to an iPad across screens works exactly as smoothly as the marketing demos suggest. The obvious limitation is that it only connects Apple devices, so a mixed Windows and Mac household gets no benefit from it at all.

Pros: Zero setup required, exceptionally smooth cursor handoff, native drag-and-drop file transfer between devices.

Cons: Apple devices only, with no path to including a Windows or Linux machine in the same setup.

Best for: Mac and iPad users fully inside the Apple ecosystem who want a zero-configuration solution.

5. ShareMouse

ShareMouse sits in a useful middle ground for mixed Windows and Mac environments, offering the kind of near-zero-configuration setup that Apple and Microsoft’s native tools provide, but working across both platforms rather than staying locked to one. It auto-detects other computers running the software on the same network and connects them without manual IP configuration, and clipboard and drag-and-drop file sharing both work out of the box.

Pros: Cross-platform between Windows and Mac, easy auto-detection setup, clipboard sharing and drag-and-drop file transfer.

Cons: The free version caps out at two computers, and larger setups require a paid license.

Best for: Mixed Windows and Mac households or small offices needing straightforward cross-platform sharing.

6. Input Leap

Input Leap is a newer fork in the same lineage as Barrier, created after some contributors felt Barrier’s own development had slowed. It aims to modernize the codebase with better Wayland support on Linux, an area where older Synergy forks have historically struggled, and cleaner configuration tooling overall. For Linux users specifically running newer desktop environments, Input Leap has become the more reliable choice in this family of open-source tools.

Pros: Modern codebase with active development, notably better Wayland compatibility on Linux, free and open-source.

Cons: Smaller user base and community than Barrier, meaning less accumulated troubleshooting documentation online.

Best for: Linux users on modern Wayland-based desktop environments who need reliable multi-device sharing.

Software Sharing Versus Hardware KVM Switches

It’s worth stepping back to compare this entire category of software against the older hardware alternative: a physical KVM switch. A KVM switch routes keyboard, video, and mouse signals between multiple computers through a dedicated box, switching with a button press or hotkey rather than a network connection. The tradeoffs are almost the inverse of software solutions. Hardware KVM switches add zero network latency, since there’s no data traveling over Wi-Fi or Ethernet to coordinate the switch, and they work regardless of what operating systems the connected machines are running, since the switch operates below the OS level entirely. The cost is convenience: you need a physical cable running to each computer, switching happens at the box rather than by simply moving your cursor to a screen edge, and there’s no clipboard or file sharing unless you add separate software for that.

For latency-sensitive work, gaming, video editing, or any task where even a few milliseconds of input lag matters, a hardware KVM switch remains the better choice despite the extra cabling hassle. For general productivity work, checking email, writing, browsing, switching between a work laptop and a personal desktop, software solutions like the ones above are almost always more convenient, and the latency difference is imperceptible for typing and clicking.

Why This Category Splintered So Much

It’s worth understanding why “Synergy alternative” now points to such a scattered field rather than a handful of obvious competitors, the way most software categories tend to consolidate over time. Part of the answer is that the underlying problem, sharing input devices across machines, turned out to have very different optimal solutions depending on how homogeneous your setup is. Apple and Microsoft both realized that a native, first-party solution tuned exclusively for their own ecosystem could deliver a dramatically smoother experience than a general cross-platform tool ever could, since they control both the operating system and, increasingly, the hardware. That’s why Universal Control feels almost magical for Mac and iPad users in a way no cross-platform tool has matched. The tradeoff is that native solutions only work within their own walled garden.

At the same time, the open-source side of the market fragmented for a more mundane reason: disagreements over project direction and licensing led to forks, and forks tend to multiply rather than recombine once trust in the original maintainers has eroded. Barrier forked from Synergy, and Input Leap later forked from Barrier, each time driven by a specific group of contributors who wanted development to move in a direction the previous maintainers weren’t taking it. This is a common pattern in open-source software generally, and it means evaluating “which fork is currently best maintained” is now a real part of choosing a tool in this category, rather than a one-time decision you can make and forget.

Setting Up a Reliable Connection

Regardless of which tool you land on, a few setup habits meaningfully reduce the connection issues people report with this category of software. Static IP addresses, or at minimum a consistent DHCP reservation for each machine on your router, prevent the frustrating scenario where a tool that worked perfectly yesterday suddenly can’t find your other computer today because its local network address changed. Wired Ethernet connections, where practical, produce more stable results than Wi-Fi, since Wi-Fi’s variable latency and occasional dropped packets translate directly into stuttering cursor movement and delayed keystrokes, particularly noticeable if you’re typing quickly.

It’s also worth disabling sleep or power-saving modes that aggressively suspend network interfaces on the “server” computer, the one whose keyboard and mouse you’re actually using, since some of these tools rely on that machine staying fully awake and network-reachable even when its display goes idle. A computer that drops off the network during a brief idle period will disconnect the whole setup, requiring a manual reconnect that defeats the point of a seamless multi-device workflow.

Frequently Asked Questions

Is it safe to share a keyboard and mouse over a network between a work computer and a personal one? This depends heavily on your employer’s IT policy, and it’s worth checking before connecting a work machine to any of these tools. Corporate security policies sometimes explicitly prohibit software that could theoretically capture keystrokes across a network boundary, even when the tool itself is legitimate, simply because IT departments can’t easily distinguish a compliant install from a compromised one at a glance. When in doubt, ask your IT department directly rather than assuming a widely used open-source tool is automatically sanctioned, since policy on this varies enormously between organizations and industries.

Why did Barrier and Input Leap fork away from Synergy in the first place? Synergy’s parent company shifted toward a more commercial, subscription-oriented model for its later versions, which frustrated a segment of its user base that had relied on it as free, open software for years. The forks preserved the last open-source codebase and continued developing it independently, free from that commercial direction. This kind of split is common wherever a well-loved free tool starts monetizing more aggressively, and it tends to leave the original brand name with the paid, more polished product while the forks carry forward the free, community-driven spirit the original project started with.

Does switching to one of these alternatives mean giving up features Synergy offers? For most users, no. The core cursor and keyboard sharing, clipboard sync, and in some cases file transfer are all present across these alternatives. Synergy’s more recent paid tiers do offer some enterprise-focused features like centralized device management that the free alternatives don’t replicate, which matters mainly for IT departments managing many machines rather than individual users. For a home office or small team setup, that gap is rarely noticeable in daily use.

Multi-device workflows connect to broader productivity setups. Explore screen recording tools for capturing multi-monitor work, check out Notion alternatives for cross-device documentation, and discover Slack alternatives for multi-device communication.

Security Considerations Worth Taking Seriously

Any tool that transmits keyboard and mouse input, and sometimes clipboard content, between machines over a network deserves a moment of security thinking before installation, particularly on a shared or corporate network. The clipboard sharing feature that makes these tools convenient, automatically syncing whatever you copy on one machine to the others, also means sensitive data like passwords or confidential text you copy briefly can end up transmitted across your local network and cached on multiple devices without you necessarily intending that. Most of the tools above let you disable clipboard sync selectively, and it’s worth doing so on any machine handling genuinely sensitive information.

Open-source options like Barrier and Input Leap have the advantage of publicly auditable code, meaning security researchers and the broader community can and do review the source for vulnerabilities, which isn’t something you can verify with the same confidence for closed-source commercial tools. That doesn’t mean closed-source options are inherently less secure, but it does mean the open-source alternatives offer a specific kind of transparency that matters if your setup involves any genuinely sensitive work. Regardless of which tool you choose, keeping it updated matters more than people expect, since older versions of network-facing software are a common target once vulnerabilities become public knowledge, and a tool you installed once and never revisited is exactly the kind of software that quietly falls behind on security patches.

When None of These Tools Are the Right Answer

Sometimes the honest answer is that this entire category of software solves the wrong problem for your actual situation. If you’re constantly switching between a laptop and a desktop purely because you need access to the same files and applications, a cloud sync tool or a remote desktop solution might serve you better than input sharing, since it addresses the underlying need, access to your work, rather than just the mechanical problem of moving a cursor between screens. Similarly, if your multi-device setup exists mainly because you’re testing software across different operating systems, a virtual machine running on a single powerful computer often eliminates the need for physical multi-device switching entirely, trading a bit of performance for a dramatically simpler setup with none of the network configuration headaches described above.

Multi-Device Tips for 2026

Ensure all computers are on the same network for best performance, since these tools generally rely on local network discovery and struggle across separate subnets or VPN-segmented networks without extra configuration. Configure firewall rules if experiencing connection issues, since some of these tools use specific ports that overly aggressive firewall or antivirus software will silently block without an obvious error message. Consider cable-based KVM switches for situations requiring zero latency, particularly gaming or precision creative work where even small input delays are noticeable. And if you’re running a genuinely mixed environment, Windows, Mac, and Linux machines all in the same setup, expect to compromise somewhere: no single tool on this list covers every combination as smoothly as the platform-specific native options handle their own ecosystem, so pick based on which platform combination you actually use most rather than chasing a single tool that claims to do everything. In practice, most people who run genuinely mixed environments end up running two tools side by side, a native option for the majority of their devices and a cross-platform fallback for the odd machine out, and that hybrid approach tends to produce a better day-to-day experience than any single compromise tool would.