How the best content calendars are drawn

I assumed colour should mean platform. One colour for the X posts, one for LinkedIn, one for the newsletter - obvious, right? Then I read twenty-nine content calendars back to back, and nearly every good one told me I was wrong.

I had a reason to look. I was replacing a grid of eight static cards with an actual calendar - one surface where a single non-technical operator could see a month of drafted posts across several platforms, fix one, and move another. Before building it I did the boring thing and studied how the best tools already draw this: social schedulers, marketing suites, editorial tools, and the generalist calendars everyone already knows.

What follows is what the good ones agree on. It is less about taste than it looks, because most of these choices trace back to how human vision actually works.