The idiot proof app is email.

Email is the digital successor to the memorandum, which is turn the apex of a line of written communication mechanisms dating back thousands of years.

A Sumerian boss got his reports via tablet. Phahroh via papyrus. Roosevelt via telegram. Pershing via a rolled up message tied to a bird.

Instead of futzing around with some fragile app which may or may not be designed for what I'm doing, I can send an email to nearly anyone on earth that I need to deal with.