Saffsanity/sill

This page introduces an external open-source repository. It is not an HDATF product.

What it does

Sill is an Apache-2.0 licensed pair of apps, one for the Mac and one for iPhone and iPad, that shows one Mac window or the whole desktop on the device and lets the user operate it there with touch, a trackpad, a keyboard or Apple Pencil. Sill for Mac is a free notarized download (checked by Apple for distribution outside the App Store) from getsill.app, and Sill for iPhone and iPad is free on the App Store. When a device picks a window, Sill for Mac captures it with ScreenCaptureKit, encodes it as HEVC with VideoToolbox and sends it over TLS 1.3 on TCP, and capture runs only while a device is connected. When the encoder or the link falls behind, Sill for Mac drops frames instead of queueing them, and the device shows each decoded frame at once so the picture stays current. Taps, clicks, scrolls, keys and Apple Pencil input become mouse and keyboard events on the Mac through the Accessibility permission, and three-finger gestures run features such as Mission Control. Devices find the Mac with Bonjour on the local network or connect over a USB cable, and Remote Access, off by default, lets paired devices also connect from other networks through the user's own VPN or a router port forward to TCP port 7455. Each device pairs once with a QR code or a 12-digit code shown on the Mac (automatically over the cable), after which every connection accepts only the keys exchanged when pairing, and the Mac keeps its keys and the paired-device list in its keychain without iCloud sync. There is no account and no relay server, and the only request beyond the user's devices is Sill for Mac's once-a-day update check, which sends its version number to GitHub and can be turned off. The Mac must be an Apple silicon model on macOS 14 or later with the Screen Recording and Accessibility permissions, and macOS 15 or later also needs the Local Network permission. The iPhone or iPad needs iOS or iPadOS 17 or later with Local Network and camera access, and building from source needs Xcode 27 (Xcode 27.1 for the iPhone and iPad app). Limits listed in the docs are one window or the desktop at a time, picture without the Mac's sound, a brief black frame when a window is resized, and stalls after a lost packet because the transport is TCP. The docs also note that with Require pairing turned off any device on the network can connect (still encrypted), and that Sill for Mac 0.3.1 and earlier had no encryption or pairing on home connections.

License

Apache-2.0 Permissive, with a patent grant. Commercial use is allowed; keep the notices and state your changes.

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