I fully agree with your first two paragraphs. > I have a theory that the solution to this problem is for professionals (not just software engineers!) to write

I fully agree with your first two paragraphs. > I have a theory that the solution to this problem is for professionals (not just software engineers!) to write their own productivity apps I agree with this in theory -- I love tools, tooling, and composition-based frameworks to roll your own tools. And I enjoy what you've done so far, especially the spaced repetition character system, which reminds me of my days learning kanji. For me, at least, the risks I foresee are (1) I would be on the hook for maintaining the app if something goes wrong, (2) I would have to spend a lot of work making it look nice enough that it wouldn't bug me, and (3) I don't know if it would be flexible enough to accommodate changes in my workflow in the future. I would love to see, for example, a tutorial on how to roll you own to-do app in 10 minutes and deploy it.