Sill streams a live window or the whole desktop from a Mac to an iPhone or iPad, letting you interact with it by touch, Apple Pencil, trackpad and external keyboard. It captures windows on Apple silicon Macs using ScreenCaptureKit, encodes video with VideoToolbox (HEVC) and sends it over an encrypted TLS 1.3 connection directly to the device; inputs (clicks, taps, scrolls, keys, Pencil) are converted to macOS events and sent back. Connections work on the same network via Bonjour, over USB, via peer-to-peer Direct Wireless Connection when no network is shared, or remotely through a personal VPN like Tailscale. Pairing binds devices with exchanged keys so there are no intermediary servers or accounts. Requirements: Apple silicon Mac on macOS 14+, iPhone/iPad on iOS/iPadOS 17+.
Sill focuses on low-latency, current video by dropping frames rather than queuing when encoder or link lags, and offers controls for quality, resolution and frame rate. Features include two-way clipboard (text only, up to 256 KB), window text resizing, an optional virtual display to keep a streamed window updating when covered, menu access via Accessibility, and iPhone Duo/cover-display support. Limits: one streamed window at a time, no Mac audio, Mac must stay awake with Sill running, and some private APIs keep the Mac app distributed outside the Mac App Store. Sill is free, open source and notarized for Mac.
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