TL;DR: Microsoft Visio 2021 Professional for Windows is $9.97 (reg. $249.99)-a one-time license for serious diagramming without a subscription. Visio is the software equivalent of tidying up a junk ...

Firstly, consider the purpose of your diagram. Are you trying to show a process, illustrate a relationship, or compare data? Your goal will determine the type of diagram you choose, be it a flowchart, ...