[swaggyBoatswain]

Mermaid js does that though, and many notetaking apps integrate with it

Personally Draw.io is the best freeapp already out there (online based or desktop), but lucidchart for paid is great too (much better print capabilities)

[wooly_bully]

Mermaid.js is excellent, and takes very little time to learn. The quick render is VS Code is super useful for throwing together diagrams quickly