
Create diagrams and charts from text in a simple, intuitive, and highly customizable way.
Visit WebsiteThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Diagrams as code
Biggest con
Limited styling
TL;DR - Mermaid
- Generates diagrams and charts from text definitions.
- Supports various diagram types like flowcharts and sequence diagrams.
- Simplifies visualization for developers and technical writers.
What is Mermaid?
Available on: Web
Pros & Cons
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
Ratings Across the Web
Mermaid holds an aggregate rating of 4.7 out of 5 from 6 reviews across G2, last checked March 18, 2026.
What people say
“Nothing to complain about at all, it has all the features I need, doesn't cost much, never breaks due to new releases”via G2
Ratings aggregated from independent review platforms. Learn more
Key Features
Pricing Plans
7-day Free TrialPricing checked Aug 27, 2026
Open Source
Free
- MIT licensed
- Flowcharts & diagrams
- Text-to-diagram
- Community support
Basic
Free
- 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?
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.
Hidden Costs & Gotchas
AI usage limits on Basic tier
Premium features require custom quote
No annual discount mentioned
How Mermaid Compares to Competitors
Compared to Lucidchart, which starts around $7.95/month for basic individual plans, Mermaid's 'Plus' tier at $8/month offers similar value with the added benefit of text-to-diagram and AI features. Draw.io is free and open-source like Mermaid's base, but Mermaid's paid tiers add AI and hosted solutions that Draw.io doesn't natively offer.
How Mermaid's pricing compares
At $8/mo, Mermaid is mid-range of its 4 direct competitors ($1.7 to $9/mo across the set).
Entry paid plan, monthly. Pricing checked Aug 27, 2026.
Reviews

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Mermaid FAQ
How does Mermaid simplify the creation of diagrams for documentation?
Which teams would benefit most from using Mermaid?
How is Mermaid's approach to diagramming different from a tool like Lucidchart?
What kind of limitations should users be aware of when using Mermaid?
Does Mermaid include a free tier for its diagramming capabilities?
Can Mermaid diagrams be integrated with GitHub workflows?
Source: mermaid.js.org