
r/Applesilicon

I built a free tool to use an Intel iMac as external display for Apple Silicon MacBook — via Thunderbolt, no dongle
Apple Silicon killed Target Display Mode. TargetBridge brings it back via software.
One Thunderbolt cable, MacBook streams its screen to the iMac at up to 5K HEVC. No dongle, no subscription, free and open source.
How it works: ScreenCaptureKit captures the MacBook display → HEVC encode via VideoToolbox (GPU, not CPU) → streams over Thunderbolt Bridge IP → iMac decodes and displays fullscreen.
Requirements:
- Apple Silicon MacBook (M1 or later) — sender
- Intel iMac 2017 or later on macOS 14 Sonoma — receiver
- Thunderbolt 3/4 cable
GitHub: https://github.com/swellweb/targetBridge
Pre-built apps in the releases, no Xcode needed.
Beta testers wanted: Rosetta Check 2.0 adds plugin scanning for Pro Tools, Logic, and Photoshop
I've been building Rosetta Check, a Mac utility that tracks which of your apps still depend on Rosetta 2. Version 2.0 extends that to plugins and components — the part most people haven't thought about yet.
It currently scans for Intel-only:
- AAX plugins in Avid Pro Tools
- Audio Units in Logic Pro
- Plugins and extensions in Adobe Photoshop
With Rosetta 2 deprecation likely coming, a lot of creative professionals are going to get a nasty surprise when their plugin chain stops working. This tries to give you a heads-up before that happens.
If you use any of these apps and want to kick the tyres before the full release, here's the TestFlight link: https://rosettacheck.com/testflight
Happy to answer questions or hear what plugins/hosts you'd want added next.