Mermaid
JavaScript-based diagramming tool that renders diagrams from text definitions.
Overview
Mermaid is a javaScript-based diagramming tool that renders diagrams from text definitions. It handles text-based, markdown, git-friendly, and many chart types, and it's best suited for developers wanting text-based diagrams in markdown. It has been around since 2014, giving it a 12-year head start in building out integrations and refining the product.
The core product is entirely free. Since it's open-source, you can self-host for free with no user limits. It's aimed at individual users, so it's fast to set up but may lack team-management features if you scale.
Strengths
- Open source and transparent
- Includes Text-Based as a core feature, purpose-built for diagramming workflows
- Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
- The core product is free with no paywalled essentials
Weaknesses
- May lack some advanced features
- Self-hosting is free but requires server maintenance and DevOps knowledge
- Fewer built-in features means you may need additional tools to cover gaps
- Ecosystem of third-party integrations is smaller than the market leaders in diagramming
Quick info
- Category
- Diagramming
- Starting price
- Free
- Free tier
- Fully free
- Open source
- Yes
- Best for
- Individuals
- Founded
- 2014
Last updated 2026-04-12
Top alternatives to Mermaid
Intelligent diagramming platform for flowcharts, wireframes, and technical diagrams.
Free, open-source diagramming tool that works in the browser with no account needed.
Open-source collaborative whiteboard with a friendly interface and embeddable SDK.
Collaborative whiteboard from Figma for brainstorming, diagramming, and workshops.
Mermaid comparisons
vs
vs
vs
vs
vs
vs
More Diagramming tools
Stay sharp
New diagramming tools, price changes, and honest takes — weekly.