> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sharecursor.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ShareCursor

> A low-latency, open-source software KVM — move one keyboard, mouse, clipboard and files between macOS and Windows over your LAN, end-to-end encrypted.

**ShareCursor** lets you move a single keyboard & mouse — plus the clipboard and
files — between your **macOS** and **Windows** machines over the LAN, with the
lowest input lag we can squeeze out.

Think ShareMouse / Synergy / Deskflow, but **free, open, and built for latency
first**. It's a free alternative to Synergy, ShareMouse, Barrier and Input Leap,
the Mac-capable answer to Mouse Without Borders, and effectively Universal
Control for Windows.

<Warning>
  **Development status:** ShareCursor is under active development and may not
  work reliably on every macOS and Windows setup. If you try it, please
  [report bugs](https://github.com/phun333/ShareCursor/issues/new?template=bug_report.yml),
  [suggest improvements](https://github.com/phun333/ShareCursor/issues/new?template=feature_request.yml), or
  [contribute a fix](https://github.com/phun333/ShareCursor/blob/main/CONTRIBUTING.md).
</Warning>

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart" horizontal>
    Set up ShareCursor on your two machines.
  </Card>

  <Card title="Download" icon="download" href="/download" horizontal>
    Get the latest macOS `.dmg` or Windows installer.
  </Card>

  <Card title="How it works" icon="diagram-project" href="/concepts/architecture" horizontal>
    The UDP + TCP dual-channel design behind the low latency.
  </Card>

  <Card title="Compare" icon="scale-balanced" href="/compare/overview" horizontal>
    ShareCursor vs. Synergy, ShareMouse, Barrier & more.
  </Card>
</CardGroup>

## What it does

<CardGroup cols={2}>
  <Card title="One keyboard & mouse" icon="keyboard">
    Push your cursor across the screen edge to control the other machine — no
    hotkey needed.
  </Card>

  <Card title="Shared clipboard" icon="clipboard">
    Copy on one machine, paste on the other. Text and images sync automatically.
  </Card>

  <Card title="Drag-and-drop files" icon="file-arrow-up">
    Send files between machines over a reliable, chunked transfer channel.
  </Card>

  <Card title="End-to-end encrypted" icon="lock">
    X25519 + a shared passphrase + ChaCha20-Poly1305 on every channel. LAN-only,
    no cloud, no accounts.
  </Card>
</CardGroup>

## Why another KVM?

We surveyed everything in this space before writing a line of code and took the
best of each: **Lan Mouse's** UDP input path for lowest latency,
**Deskflow/Synergy's** portable key IDs and clipboard/file features, and
**ShareMouse's** "drag-and-drop just works" UX goal.

| Tool            | License    | Mouse/KB | Clipboard |  Files  |
| --------------- | ---------- | :------: | :-------: | :-----: |
| ShareMouse      | Paid       |    Yes   |    Yes    |   Yes   |
| Synergy         | Paid       |    Yes   |    Yes    |   Yes   |
| Deskflow        | GPLv2      |    Yes   |    Yes    | Partial |
| Input Leap      | GPLv2      |    Yes   |    Yes    | Partial |
| Barrier         | Open       |    Yes   |    Yes    |    No   |
| Lan Mouse       | Open       |    Yes   |     No    |    No   |
| **ShareCursor** | MIT/Apache |    Yes   |    Yes    |   Yes   |

<Note>
  ShareCursor's transport adds only **\~6 µs one-way** overhead on loopback — your
  real input lag is dominated by LAN round-trip and OS injection, not our code.
  See [Latency](/concepts/latency).
</Note>

## Get help

<CardGroup cols={2}>
  <Card title="Troubleshooting" icon="wrench" href="/troubleshooting">
    Fixes for the most common setup issues.
  </Card>

  <Card title="Open an issue" icon="github" href="https://github.com/phun333/ShareCursor/issues">
    Report a bug or ask a question on GitHub.
  </Card>
</CardGroup>