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TargetBridge 3.6.0: my open-source project for reusing an iMac as a wired Mac display

I built TargetBridge because I wanted to keep an iMac useful as a display without opening it up or replacing its electronics. It runs a Sender app on one Mac and a Receiver on the other, streaming the desktop over Thunderbolt Bridge networking. It supports mirror and extended desktop modes. It is software streaming, not a restoration of Apple's hardware Target Display Mode. I released 3.6.0 yesterday. This update focuses on the less glamorous things that make it easier to live with: R

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痛点：Apple 早已取消 Target Display Mode，大量用户的旧 iMac 无法再当外接显示器用，只能拆机改装或闲置吃灰。

目标用户：手上有旧 iMac / Mac mini 想当副屏的 Mac 用户，尤其是 Intel iMac 用户、二手 Mac 玩家、居家办公多屏需求者

证据：I built TargetBridge because I wanted to keep an iMac useful as a display without opening it up or replacing its electronics. / It is free and MIT-licensed, with no subscription or proprietary display dongle required. / They are not Apple-notarized, and macOS may request privacy approval again after updating.

变现：开源核心 + 付费成品：做已签名公证、开箱即用的 macOS 商业版（一键配对、自动重连、音频/HEVC Pro 功能），一次买断 15–30 美元；企业/多机部署授权；或提供付费优先支持与长期兼容性维护订阅。

MVP：2 周内做一个「签名公证 + 图形化引导」的封装版：ScreenCaptureKit 抓屏 + 硬件 H.264/HEVC 编码，走 Thunderbolt Bridge/局域网传输，Receiver 端全屏显示；重点是自动发现接收端、一键配对、断线自动重连、权限引导，用 LemonSqueezy/Paddle 做 license 校验，先卖 19 美元买断。

竞品：Luna Display (Astro HQ)、Duet Display、DeskPad、Apple AirPlay to Mac、BetterDisplay、macOS 内置屏幕共享

摘要：独立开发者发布 TargetBridge 3.6.0，用软件串流（Thunderbolt Bridge + H.264/HEVC）让旧 iMac 变成有线第二显示器，替代已被 Apple 砍掉的 Target Display Mode，MIT 开源且免费，需要 macOS 14/15+ 和雷雳线。痛点真实且长期存在（Luna Display 等付费竞品已验证有人为「iMac 当副屏」付钱），但作者选择免费开源、且 AirPlay to Mac 等免费方案已在竞争，纯工具本身变现空间有限。机会点在于把这类方案做成已公证、开箱即用的付费成品而非裸开源构建。