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Create diagrams and charts from text in a simple, intuitive, and highly customizable way.

Free, no paid tierVisit Website
Reviews on G2
11 reviews tracked

The Bottom Line

Price
Free, no paid tier. Compare plans

Key facts

  • Generates diagrams and charts from text definitions.
  • Supports various diagram types like flowcharts and sequence diagrams.
  • Simplifies visualization for developers and technical writers.

Pros

  • Diagrams as code
  • GitHub native support
  • Free and open source
  • Many diagram types
  • Easy syntax

Cons

  • Limited styling
  • Complex diagrams hard
  • Rendering varies
  • Documentation gaps
  • Less flexible than draw tools

What is Mermaid?

Editorial review
Mermaid is a JavaScript-based diagramming and charting tool that renders Markdown-inspired text definitions into dynamic diagrams in the browser. It allows users to create a wide variety of diagrams, including flowcharts, sequence diagrams, class diagrams, state diagrams, gantt charts, pie charts, and more, all by writing simple text. This tool is ideal for developers, technical writers, and anyone who needs to quickly and easily visualize complex information without the need for specialized design software. Its text-based approach integrates seamlessly into documentation, wikis, and markdown files, making diagram creation and maintenance efficient and version-controllable. The key benefit is its ability to transform plain text into professional-looking diagrams, simplifying communication and collaboration.

Available on: Web

Ratings Across the Web

4.7 (11 reviews)

Mermaid holds an aggregate rating of 4.7 out of 5 from 11 reviews across G2, last checked August 28, 2026.

Ratings aggregated from independent review platforms. Learn more

Key Features

  • Diagram as code
  • Flowcharts
  • Sequence diagrams
  • Gantt charts
  • Git integration
  • Markdown support

Pricing Plans

7-day Free Trial

Pricing checked Sep 27, 2026

Mermaid plans and prices, checked September 2026
PlanPriceDetails
Open Source

$0

  • MIT licensed
  • Flowcharts & diagrams
  • Text-to-diagram
+1 more
  • Community support
Basic

$0

  • 3 diagrams
  • Limited AI usage
  • Mermaid Chart hosted
Plus

$8/month

  • Unlimited diagrams
  • Scalable AI usage
  • Team collaboration
Premium

Custom

  • Massive AI usage
  • SSO
  • Knowledge management

Is Mermaid worth the price?

Great value

Mermaid offers a very generous free tier with its open-source option and a functional 'Basic' tier for free.

The 'Plus' tier at $8/month for unlimited diagrams and scalable AI is highly competitive. This pricing structure is excellent for individual developers and small teams looking for powerful diagramming tools.

Full Mermaid pricing: every plan, hidden costs and alternatives

How Mermaid's pricing compares

At $8/mo, billing unit not specified, Mermaid is mid-range of its 4 comparable direct competitors ($1.70 to $9/mo across the set).

Entry paid plan, monthly. Pricing checked Sep 27, 2026.

Reviews

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4.7/5

Across 11 verified user reviews on G2

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Mermaid FAQ

How does Mermaid simplify the creation of diagrams for documentation?

Mermaid allows users to create a wide variety of diagrams, such as flowcharts and sequence diagrams, directly from Markdown-inspired text definitions. This text-based approach integrates seamlessly into documentation, wikis, and markdown files, making diagram creation and maintenance efficient and version-controllable.

Which teams would benefit most from using Mermaid?

Mermaid is ideal for developers, technical writers, and anyone who needs to quickly and easily visualize complex information. Its text-based diagramming simplifies communication and collaboration within these teams.

How is Mermaid's approach to diagramming different from a tool like Lucidchart?

Mermaid uses a 'diagrams as code' approach, rendering Markdown-inspired text definitions into dynamic diagrams. In contrast, tools like Lucidchart typically rely on graphical user interfaces for drag-and-drop diagram creation.

What kind of limitations should users be aware of when using Mermaid?

Users may find Mermaid has limited styling options and can make complex diagrams hard to manage. Additionally, rendering may vary across different environments, and there can be gaps in its documentation.

Does Mermaid include a free tier for its diagramming capabilities?

Mermaid is free to use, as it is an open-source tool that does not require a paid plan. This allows users to create diagrams from text without any cost.

Can Mermaid diagrams be integrated with GitHub workflows?

Yes, Mermaid offers native support for GitHub, allowing for seamless integration of its text-based diagrams within GitHub repositories and documentation. This facilitates version control and collaboration for diagrams.

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