Or Notes.app.. or Reminders.app, both of which are available by default on every Mac, iPad and iPhone. Heck Reminders.app is even on Apple Watch.

I get that not everyone uses a Mac (I'd imagine HN audience is probably more likely to than the average population though), and I haven't used a Windows machine for anything besides browser bug testing since XP was relatively new... is there really not a basic note taking/reminders app built in on Windows.. whatever?