README

Sill

Any window from your Mac, on your iPhone and iPad.

Sill shows a window from your Mac, or the whole desktop, on your iPhone or
iPad. You use it there with touch, a trackpad, a keyboard or Apple Pencil.
Sill for Mac captures the window, encodes it as HEVC video and sends it to the
Sill app on your device. Your taps, clicks, scrolls and keys go back to your
Mac. Your Mac and your device connect on the same network, over a USB cable,
with Direct Wireless Connection when they share no network, or through your
own VPN, such as Tailscale, with Remote Access. There is no account and no
server in between.

getsill.app ·
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Sill for Mac is a free, notarized download from
getsill.app; with Homebrew,
brew install --cask saffsanity/sill/sill installs the same download from
Sill's own tap. Sill for iPhone
and iPad is free on the App Store,
and you can also build it from source (below).

To try the next version before it ships: Sill for iPhone and iPad has a
public beta on TestFlight, and Sill for Mac
has nightly builds on
GitHub, notarized like a release but not supported. Your devices stay paired
(a nightly uses the release's identity), and Sill's update check never offers
a nightly: the release above is the one to use.

 Screenshots

These are the iPad screenshots from the App Store; on iPhone and iPhone Duo,
Sill has layouts of its own.

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 Requirements

- A Mac with Apple silicon or an Intel processor, on macOS 14 or later.
- An iPhone or iPad with iOS 17 or iPadOS 17 or later.
- On your Mac, Sill asks for Screen Recording, to show your windows, and
  Accessibility, to click, scroll and type for you and to move and size the
  window it shows. On macOS 15 or later, also allow Local Network. On your
  iPhone or iPad, Sill asks for Local Network, to find your Mac, and for the
  camera when you scan your Mac's pairing code (you can type the code
  instead).
- Your Mac and your device on the same network, joined by a USB cable, or near
  each other with Direct Wireless Connection on. Away from home, your own VPN,
  such as Tailscale, with Remote Access on.

 How it works

- Sill for Mac lives in the menu bar. When your device picks a window, or
  the whole desktop, Sill captures it with ScreenCaptureKit and encodes it as
  HEVC with VideoToolbox, on the hardware video encoder in your Mac (or, while
  that is busy, in software). It captures nothing while no device is connected.
- The picture goes over an encrypted connection (TLS 1.3) straight to the
  Sill app on your iPhone or iPad, which decodes and shows it. When the
  encoder or the link falls behind, Sill drops frames rather than queue them,
  so the picture stays current.
- Your input goes back the same way: taps and clicks, scrolls with
  momentum, the on-screen trackpad, keys and typed text, and Apple Pencil as
  the pointer. Sill for Mac turns it into mouse and keyboard events, which
  needs Accessibili

Top issues

Latest release

Sill 0.6.0 brings the clipboard both ways between your Mac and your iPhone or iPad, sound from your Mac as a beta, and a locked Mac that shows only its lock screen. On the device there's more: a hardware keyboard and trackpad that work as soon as the picture shows, pinch to zoom, Larger Picture on iPhone, typing in Chinese, Japanese and Korean, your Mac computers as tiles, and the tour once more with what's new marked. On the Mac, Virtual Display and Send Audio are on by default, a window Sill resized goes back to its own frame, and security fixes from a scan of the code.

One version for both