I think the core issue is that:<p>- Calendars are good at appointments but bad at everything else.<p>- Day planners are good for jotting down what you're working on and for revisiting what you did last week/month, but if you put anything with a deadline in your day planner you're bound to forget it. And if you have a ton of notes that relate to a single project, where do you put them?<p>- To-do lists tend to accumulate tasks and then you declare TODO bankruptcy, delete everything, and start over.<p>I'm convinced it's possible to merge these concepts intelligently, in a way that hasn't been done before. An app that has a free-form day planner, but you can still tag items with a due date, tags, etc so you can still see which deadlines are approaching.<p>You want to be able to zoom-in and zoom-out in your "tree" so you can do high level planning but you also want to be able to indent and add as many notes/ideas as you want without losing track of the bigger picture. With real-time multiuser editing and end-to-end encryption. That's what we're building with <a href="https://www.thymer.com" rel="nofollow">https://www.thymer.com</a>