What is the difference between Mermaid and Eraser?

Mermaid is best for Developers wanting text-based diagrams in markdown, while Eraser is best for Engineering teams creating architecture diagrams and technical documentation. Mermaid starts at Free and Eraser starts at Free.

Is Mermaid or Eraser cheaper?

Mermaid starts at Free and is free. Eraser starts at Free and is free.

Is there a free alternative to Eraser?

Both Mermaid and Eraser offer free tiers.

Mermaid vs Eraser

Mermaid is javaScript-based diagramming tool that renders diagrams from text definitions, while Eraser is technical diagramming tool for software architecture, system design, and engineering docs. Mermaid is open source and can be self-hosted, giving you full control over your data. Mermaid is built for developers wanting text-based diagrams in markdown, whereas Eraser targets engineering teams creating architecture diagrams and technical documentation.

At a glance

	Mermaid	Eraser
Best for	Developers wanting text-based diagrams in markdown	Engineering teams creating architecture diagrams and technical documentation
Starting price	Free	Free
Free tier	✓	✓
Open source	✓	—
Free tier available	✓	✓
Open source	✓	—
AI generation	—	✓
Architecture diagrams	—	✓
Diagram-as-code	—	✓
Git-Friendly	✓	—
Many Chart Types	✓	—
Markdown	✓	—
Technical docs	—	✓
Text-Based	✓	—

Mermaid

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

Try Mermaid → Full review

Eraser

Strengths

Purpose-built for technical and architecture diagrams
Diagram-as-code generates visuals from text descriptions
Combines diagrams with technical documentation
AI-powered diagram generation from natural language

Weaknesses

Narrow focus — not for general brainstorming or design
Smaller community than Excalidraw or Miro
Some features still in development
Limited template library compared to Lucidchart

Try Eraser → Full review

The bottom line

Pricing: Both Mermaid and Eraser are free, so this decision comes down to features and philosophy rather than budget.

Feature gaps: Mermaid offers Git-Friendly, Many Chart Types and Markdown that Eraser lacks. Eraser brings AI generation, Architecture diagrams and Diagram-as-code that Mermaid does not have.

Open source: Mermaid is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Eraser is proprietary — you are trusting the vendor with your data and uptime.

Where each tool shines: Mermaid's biggest strengths are: open source and transparent. includes text-based as a core feature, purpose-built for diagramming workflows. Eraser's biggest strengths are: purpose-built for technical and architecture diagrams. diagram-as-code generates visuals from text descriptions.

Watch out for: With Mermaid, users commonly note that may lack some advanced features. With Eraser, the main complaint is that narrow focus — not for general brainstorming or design.

Choose Mermaid if...

Your profile matches its sweet spot: developers wanting text-based diagrams in markdown
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need Git-Friendly and Many Chart Types
You care about includes text-based as a core feature, purpose-built for diagramming workflows

Choose Eraser if...

You need a tool built for engineering teams creating architecture diagrams and technical documentation
You specifically need AI generation and Architecture diagrams
You care about diagram-as-code generates visuals from text descriptions