Spayse vs Mermaid for technical diagrams.
Mermaid is a popular text-based diagramming tool that works great inside markdown files and wikis. It is fast for simple flowcharts and sequence diagrams. But if you need design control, native LaTeX, or publication-quality exports, Mermaid has no way to deliver them. That is where Spayse comes in.
Visual control vs code-only.
| Capability | Spayse | Mermaid |
|---|---|---|
Visual drag-and-drop canvas | ||
Design control Colors, fonts, layout, spacing | ||
Native LaTeX rendering KaTeX inline in labels | ||
Rich component library ML layers, system arch, flowcharts | ||
Vector PDF export with embedded fonts | ||
SVG export | ||
Custom page size guides IEEE, NeurIPS, A4, custom | ||
Dark and light mode auto-sync | ||
Git-diffable source format | ||
Inline code syntax |
Code has limits. Visual design has none.
Mermaid has zero design control. Spayse has all of it.
Mermaid renders diagrams based on a layout engine. You cannot control where nodes go, how colors are applied, or what the typography looks like. Spayse gives you full visual control: drag nodes exactly where you want them, choose from smart color presets, and style every element precisely.
No LaTeX means no equations in Mermaid.
If your diagrams include mathematical notation, Mermaid cannot render it. Spayse has native KaTeX rendering. Type LaTeX directly into any label, annotation, or callout and it renders live on the canvas.
Mermaid cannot export for publication.
Mermaid outputs basic SVG. There is no PDF with embedded fonts, no page size controls, and no dark/light mode variants. Spayse exports print-ready PDF with embedded fonts, auto-generates dark and light versions, and includes page guides for IEEE, NeurIPS, and A4 formats.