mermaid

What it does

Describe a flowchart, sequence diagram, Gantt chart or pie chart in a short markdown-like syntax and Mermaid renders it. There is a live editor on the project site, so you can paste text in and see the result without installing anything, and many platforms - GitHub among them - render the syntax natively. You write the structure yourself; it is a drawing tool, not a generator, and very complex layouts get awkward to control from text alone.

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

Screenshots & visuals

Before you start

• Setup difficultyEasy to start
• Command lineNot required
• API keyNot required
• Sends data onlineNo

Judged automatically from the project's own metadata. Always confirm on the official page.

mermaid FAQ

Is mermaid free?

Yes. It runs on your own machine, so there is no usage-based cost either.

Do I need to install anything or write code to use mermaid?

You install it like a normal desktop app. No command line involved.

Does mermaid work on a phone?

No. It needs a computer.

Can I use mermaid commercially?

The licence is MIT, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

Other data & diagrams tools