Mermaid
VerifiedOpen source library that turns text into flowcharts, sequence diagrams, and other charts.
See all screenshots - Deployment Cloud Based, On Premises
- Starting price Free
- Free trial Available
- Best for Freelancers, Startups, SMEs
What is Mermaid?
Mermaid is an open source JavaScript library that generates diagrams and charts from a simple, Markdown-inspired text syntax. It supports flowcharts, sequence diagrams, class diagrams, entity relationship diagrams, Gantt charts, state diagrams, mindmaps, and git graphs, and can be embedded in documentation, wikis, and developer tools. The core library is MIT licensed and free to use, self-host, or embed in other applications.
Alongside the open source library, Mermaid Chart is a commercial platform built by the project's creators that adds a visual drag-and-drop editor, AI-assisted diagram generation, team collaboration, and hosted storage. Mermaid Chart offers a free Basic plan with a limited number of diagrams, plus paid Plus, Premium, and Enterprise plans for teams that need unlimited diagrams, SSO, and centralized billing.
Key Features of Mermaid
Mermaid lists 8 documented features, including Text-to-diagram syntax similar to Markdown, Flowcharts, sequence, class, ER, Gantt, and state diagrams and Mindmaps and git graph diagrams. The list below covers what the product does rather than how it is marketed.
- Text-to-diagram syntax similar to Markdown
- Flowcharts, sequence, class, ER, Gantt, and state diagrams
- Mindmaps and git graph diagrams
- MIT licensed open source core library
- Live Editor for instant browser-based preview
- Mermaid Chart visual drag-and-drop editor (commercial)
- AI-assisted diagram generation (Mermaid Chart)
- Wide integration ecosystem (GitHub, GitLab, Notion, Confluence)
Mermaid Pricing
Mermaid lists 5 plans. Two are free; the rest are quoted on request.
Open Source Library
Free
Unlimited
MIT licensed, self-hosted or embedded use of the core mermaid.js library
Mermaid Chart Plus
Custom
Unlimited diagrams
Scalable AI usage, centralized billing for small teams
Mermaid Chart Premium
From $80/user/year
Larger teams
Team collaboration, knowledge management, SSO
Mermaid Chart Enterprise
Custom
Contact sales
All Premium features plus custom contracts and support
Mermaid Specifications
Mermaid is available on web app. It offers an API, has a free trial and has a free plan.
- Deployment
- Cloud Based
- On Premises
- Billing cycle
- Yearly
- Desktop
- Web App
- Languages
- English
- Built for
- Freelancers
- Startups
- SMEs
- Agencies
- Enterprises
- Support
- Tickets
- Integrations
- GitHub, GitLab, Notion, Confluence, VS Code, Jira
- Public API
- Yes
- Free trial
- Yes
- Free plan
- Yes
- Runs in browser
- Yes
- Customisable
- Yes
- Website
- mermaid.js.org
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