No blog post yet but I'm happy to answer any specific questions here. Effortless is a fairly simple app although there were some tricky edge cases to handle like when the task name is too long for the menu bar (especially when dealing with multiple monitors), and how to update the current task in the menu bar when making large edits to the task list. Making the app simple to use and cutting down the list of features to the bare essentials was also a process that involved a lot of iterations and talking with early users.

I learned Swift and native Mac app development in order to develop Effortless and have since fallen in love with Swift. It has replaced Python as my language of choice for many tasks.