I built a live world clock that sits behind your desktop icons (Windows + macOS). The blinking colon cost 25x more CPU than the clock.

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It is the LED world clock you see in airport lounges: a world map with real 7-segment digits, 24 cities. It runs as the wallpaper, on the desktop layer under your icons, not as a window on top of everything. Two things I learned that might be useful to someone else here. Neither OS has a public API for an animated wallpaper. On Windows you ask Progman to spawn a WorkerW behind the icon view and reparent your window into it; on macOS you place a window at desktop level and ignore mouse events so clicks fall through. Everything that animates your desktop does some version of this.

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AI 分析

痛点：多时区用户希望世界时钟常驻桌面且不占窗口、低 CPU，但系统缺少动画壁纸 API，普通时钟应用也缺少机场 LED 风格和桌面底层集成。

目标用户：需要同时关注多个时区的远程工作者、跨国团队、金融/客服/运维人员，以及桌面美化爱好者。

证据：Free version: 12 cities, red LEDs, dark theme, no account, no time limit. Pro is a one-time 4.99 EUR, not a subscription. No tracking, no ads, no telemetry... The blinking colon cost 25x more CPU than the clock.

变现：免费版限制城市数量/主题，Pro 一次性买断 4.99 EUR；可扩展为团队授权、企业定制城市列表、主题包或跨平台授权。

MVP：2 周内做 Windows/macOS 桌面底层世界时钟：12 个城市、7 段 LED、暗色主题、无网络、极低 CPU；用 Stripe/Lemon Squeezy 做一次性 License，先验证付费转化。

竞品：Wallpaper Engine、Lively Wallpaper、Fliqlo、World Clock Deluxe、Timeanddate World Clock

摘要：作者发布了一个 Windows/macOS 桌面底层世界时钟，免费版 12 城市，Pro 一次性 4.99 EUR。技术亮点是绕过系统动画壁纸 API，并发现闪烁冒号导致 CPU 从 0.13% 升到 3.20%。帖子没有展示销量或用户付费反馈，需求验证仍偏弱，但产品形态、定价和单人可实现性明确。