Comparing worldbuilding tools isn’t as simple as it seems. Different tools may use the same name for very different features. For example, Campfire & LegendKeeper have white board and flowchart tools which you can use to draw charts that show connections.
But on World Anvil, family trees and other charts like diplomacy webs and taxonomy trees use contextual data from character, organization, and other templates to build complex visualizations for you. Define the relationships, and it creates the chart automatically.
This comparison only includes stable, reputable software with dedicated support. Worldbuilding is a labor of love that involves years of work. Don’t trust it to an app someone vibe-coded on cheap hosting, then started advertising as a side hustle.
And generic knowledgebase apps like Notion, Obsidian and OneNote require hours of set-up and customization that real worldbuilding software offers out-of-the-box.