Startup Idea : Universal Time Tracking

Everybody has their own favorite ToDo site or app. There are dozens of time-tracking sites and apps, but they require you to enter tasks separately. I would like to have a time-tracking app which synchronizes tasks with my favorite ToDo app. The integration of particular app will be done by plugins. This way different people may create adapters for different ToDo apps. Therefore the time-tracking becomes universal. As for the time-tracking itself. I imagine a tray icon (Windows/Mac OS/Linux). When clicked - it shows a list of tasks. Second click selects the task and the timer starts ticking. Switching tasks is just two clicks. It should detect when I'm not using the computer for 3 minutes and auto stop. Android/iOS apps can be made as well, but most people WORK on a computer and PLAY on the phone. I'm a developer and can do it it Electron and Flutter. Need feedback if this whole idea makes any sense. Here's a list of popular ToDo apps that would require plugins. https://zapier.com/blog/best-todo-list-apps/