Your Mac’s simulators, in your pocket.

0.1 (1)

If you’re building with Claude Code or Cursor, new builds land while you’re away from the desk.

Checking each one on more than one iOS version still means getting up, going to the Mac and clicking through Simulator.

SimDeck puts those simulators on your phone, with the newest build and every OS version it’s on in one place.

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What it does

The latest build, on every OS version

One card shows your app’s newest build, e.g. 2.3 (49), and every simulator it’s on: iOS 27.1, 26.4, 18.6. A simulator still on an older build is flagged orange. Run on All installs the newest build on every running simulator, and Compare puts them side by side.

iOS 27.1 iPhone 17 Pro iOS 26.4 iPhone 16 · 2.3 (48) iOS 18.6 iPhone SE

Note: TestFlight builds are built for devices, so they can’t run on a simulator. SimDeck works with the simulator builds Xcode or your AI tool installs.

Only the simulators, nothing else

SimDeck Helper reads each simulator’s screen from Xcode’s own simulator framework, not from your Mac’s display. Touches go into the simulator directly. Your cursor stays where you left it, and no other window is ever shared. Bezel on or off, fit or actual size, or full screen.

Told when a new build lands

When a new version or build of your app turns up on a simulator (an Xcode run or a simctl install), your phone shows a notice with the build number and the simulator it’s on. Tap Switch to jump to it.

Device Hub controls from your phone

Dark AppearanceText SizeIncrease Contrast9:41 status barLocationFace IDHomeLockTypingOpen a linkLaunch an appScreenshot to PhotosRecordEraseShut down and start

Note: rotation and iPhone Duo postures stay in Xcode’s Device Hub; Xcode doesn’t let other apps change them.

Several phones, one Mac

More than one phone can connect to the same Mac. Each one shows who else is watching, and a touch from someone else shows their name on the screen, so it’s clear who tapped what.

Built on Fullframe

SimDeck runs on the streaming and pairing engine from Fullframe, my app for driving a Mac from an iPhone. The video is hardware HEVC, and the helper only encodes a frame when the simulator’s screen actually changes.

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How it works

1. Install both halves.

   SimDeck goes on your iPhone or iPhone Duo; SimDeck Helper sits in your Mac’s menu bar.

2. Approve your phone once.

   Your phone finds the Mac on your network by itself. Both show a six-digit code; click Allow on the Mac when they match.

   482 913

3. Pick a simulator.

   Watch it, drive it, and switch to each new build as it arrives.

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A layout for every way you hold it

Closed, it’s a phone layout. Open flat, the simulator list sits beside the simulator; folded like a book, the two split at the fold; and in tabletop, the simulator sits on the raised half with every control on the flat half.

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What’s coming next

Everything above works today. This is what’s being built now, from the next design.

In development

Every app, everywhere it runs

The home screen becomes a list of your apps, each with its latest build and every place it runs: iPhone and iPad simulators, the Mac build and the Windows build. Green is on the latest build, orange is behind, and Update brings that one up to date.

Run it on another simulator or OS version

Run on… asks for a device (grouped by screen size, so iPhone SE 4.7" sits next to iPhone 17 Pro Max 6.9"), an OS version and a few options: orientation, appearance, language and text size. An OS your build can’t run on is greyed out with the reason, and one you haven’t downloaded shows its size first. You can reuse a matching simulator or make a new one, and the new row shows each step as it goes.

In development

iPad window sizes

Full screen, a Stage Manager window (S, M or L), Split View at a half, two-thirds or a third, and Slide Over. Orientation too, where Xcode allows it; where it doesn’t, SimDeck says to rotate in Device Hub rather than pretending.

In development

Logs under the run

A drawer under any run shows the app’s own log as it writes it, with search and an errors filter. A crash raises a notice.

In development

Mac and Windows builds

SimDeck Helper will stream just your Mac app’s window, at its minimum size, 1280 × 800, 1440 × 900 or the full display. SimDeck Helper for Windows will run on a PC or a Windows VM on your Mac and pair the same way. It streams your Windows build’s window at common sizes and at 100, 125, 150 or 200% display scale, and one phone can pair with your Mac and your PC.