Timeline is simple, it just help you plan your week without distraction. There is no weird and complex options, just 3 things to fill and you're done. Timeline is just what you should expect from a todo app.
Timeline is available on iOS, watchOS and on the web. Which mean that you can use Timeline on pretty much every single device you own.
Always online and synchronized
All of your todos are stored securely online using iCloud's CloudKit, which mean that everything is synchronized across all of your devices.