I write and speak lots about Kafka, and get a fair few questions from this. The most common question is actually nothing to do with Kafka, but instead: How do you make those cool diagrams? So here’s a short, and longer, answer! Update July 2019 I’ve moved away from Paper -> read more here tl;dr An iOS app called Paper, from a company called FiftyThree So, how DO you make those cool diagrams?