A detailed comparison of Graphviz and Mermaid to help you choose the right tool for your needs.
Open-source graph visualization software for network diagrams
JavaScript-based diagramming tool that generates diagrams from text
| Plan | Graphviz | Mermaid |
|---|---|---|
| Free Tier | ✓ Completely free | ✓ Completely free |
| Lowest Paid | Free | Free |
| Enterprise | Free | Free |
| Feature | Graphviz | Mermaid |
|---|---|---|
| Graph visualization | ✓ | — |
| Text-to-diagram | ✓ | ✓ |
| Automatic layout | ✓ | — |
| Multiple output formats | ✓ | — |
| Command-line tool | ✓ | — |
| Library for applications | ✓ | — |
| Custom styles | ✓ | — |
| Hierarchical graphs | ✓ | — |
| Network diagrams | ✓ | — |
| Open source | ✓ | — |
| Flowcharts | — | ✓ |
| Sequence diagrams | — | ✓ |
| Gantt charts | — | ✓ |
| Class diagrams | — | ✓ |
| GitHub integration | — | ✓ |
| Markdown compatible | — | ✓ |
| JavaScript library | — | ✓ |
| Live editor | — | ✓ |
| Themes | — | ✓ |
| Open Source | ✓ | ✓ |
| Rating | ⭐ 4.3 | ⭐ 4.4 |
Choose Graphviz if: You need developers and data scientists needing automatic graph layout from text descriptions. Graphviz excels with its completely free and powerful automatic layout.
Choose Mermaid if: You need developers and technical writers needing text-based diagrams for documentation. Mermaid stands out with its completely free and text-based (version control friendly).
Best free option: Both Graphviz and Mermaid offer free tiers. Graphviz offers "Completely free" while Mermaid offers "Completely free".
It depends on your needs. Graphviz is better for developers and data scientists needing automatic graph layout from text descriptions, while Mermaid is better for developers and technical writers needing text-based diagrams for documentation. Both are excellent tools rated 4.3 and 4.4 respectively.
Graphviz starts at Free while Mermaid starts at Free. Both offer free tiers.
Most tools offer import/export features to help you migrate. We recommend trying Mermaid's free tier before fully committing to a switch.
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