reddit · SideProject · 11-01 12:50 58 分 ← 返回列表

iKnowMyDisplay - a Mac menu bar app that explains what’s wrong with your external monitor and adds the display controls macOS hides

I launched my second Mac app today. It started with a 4K monitor that ran at 30 Hz through a USB-C hub and 60 Hz straight into the Mac. macOS showed “30 Hz” and nothing else. The reason was bandwidth: the hub’s HDMI 1.4 port carries 8.16 Gbps and 4K at 60 Hz needs 12.54. That’s the first thing iKnowMyDisplay does: it reads the chain from the Mac’s port through any hub or dock to the monitor and says which hop holds you back, in one sentence. Then it kept growing into ever

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痛点：Mac 外接显示器时，刷新率和分辨率被悄悄降低（4K@30Hz），而 macOS 只显示结果、不说明是哪个环节（HDMI 1.4 带宽、Hub、线材）造成限制，同时 HiDPI 缩放、亮度、输入源等 macOS 隐藏起来的控制项无法调整

目标用户：使用 4K/5K/带鱼屏外接显示器的 Mac 重度用户：开发者、设计师、视频剪辑师，以及经常通过 USB-C Hub/Dock 连接显示器的人

证据：It started with a 4K monitor that ran at 30 Hz through a USB-C hub and 60 Hz straight into the Mac. macOS showed “30 Hz” and nothing else. The reason was bandwidth: the hub's HDMI 1.4 port carries 8.16 Gbps and 4K at 60 Hz needs 12.54. / It can't be on the Mac App Store: talking to monitors over the cable isn't allowed in the sandbox. It's sold directly and notarized by Apple.

变现：官网直接销售买断制授权（Paddle/Lemon Squeezy 收款并发放 license key，定价 15–30 美元），Pro 版解锁多显示器预设、虚拟屏幕等高级功能；用免费试用 14 天拉动转化

MVP：两周内完成：用 CoreDisplay/IOKit 读取从 Mac 端口到显示器（经过 Hub/Dock）的整条链路，解析 EDID 与 DP/HDMI 链路带宽，用一句话指出瓶颈是哪个环节（例如“Hub 的 HDMI 1.4 仅 8.16 Gbps，4K60 需 12.54 Gbps”）；并加上 DDC/CI 亮度与输入源切换；每次改动弹出“保留此设置？”并在 15 秒后自动回滚的保险机制

竞品：BetterDisplay、MonitorControl、Lunar、DisplayBuddy、SwitchResX

摘要：独立开发者发布第二款 Mac 应用 iKnowMyDisplay，起因是自己的 4K 显示器经 USB-C Hub 只能跑 30Hz 而 macOS 不作任何解释，原因是 Hub 的 HDMI 1.4 仅有 8.16 Gbps 带宽而 4K60 需 12.54 Gbps。产品把“链路瓶颈诊断”与 macOS 隐藏的显示控制（4K 的 HiDPI 缩放、外接屏亮度/输入源、桌面布局预设、虚拟屏幕、XDR 峰值亮度）打包在菜单栏。因沙盒不允许通过线缆与显示器通信，只能走官网直接销售并做公证，不能上 Mac App Store。