[sidharthv]

Mermaid, the open source library and Mermaid Live editor[1] are free to use.

Mermaid chart has a paid tier[2], and gives storage, sharing, visual editor, and more.

Disclosure: Long time maintainer of Mermaid and works on Mermaid Chart

[1] https://mermaid.live

[2] https://www.mermaidchart.com/pricing

[moi2388]

Huh, never knew mermaidchart existed. Love mermaidjs though. Any plans to ever add styling/placement options? I know that’s not the idea behind it, but optionally, perhaps?

[sidharthv]

Styling is already present in most charts, and we do have plans to support different layout algorithms which could enable support for custom placement of nodes as well.