Every feature you need. Nothing you don't.
Spayse replaces the bloat of general design tools and the pain of code-based diagramming, giving you a fast, precise canvas that outputs exactly what you designed.
A library for every kind of diagram
Whether you're mapping microservices, documenting an API flow, visualizing a neural network, or sketching a decision tree, Spayse has a component for it. Drag, connect, and customize without starting from scratch.
Every component is parametric: resize, recolor, relabel, and rewire without breaking the layout. Build once, adapt endlessly.
- Flowchart & decision trees
- System & cloud architecture
- Neural network layers
- Entity relationship diagrams
- Sequence & data flow diagrams
Outputs that actually look right
Stop worrying about whether your diagram will survive the export. Spayse gives you vector SVG and print-ready PDF with embedded fonts, so your labels stay sharp at any size, in any context, in any tool.
Set custom page dimensions or choose from built-in guides for technical documentation, academic publishing, or slide presentations. What you see is exactly what you get.
Math that belongs in the diagram
Type LaTeX directly into node labels, edge annotations, and callout banners. The built-in KaTeX engine renders it live, no preview pane, no copy-pasting from external tools.
On export, mathematical symbols become clean vector paths. They scale perfectly, print perfectly, and embed perfectly in any document.
Built for people who care about the output.
Whether you're submitting to a conference, shipping a product doc, or reviewing a PR, Spayse gives you diagrams you don't have to apologize for.
Researchers & academics
Publish-quality diagrams with native LaTeX, custom IEEE/NeurIPS page guides, and vector PDF that compiles cleanly inside LaTeX documents.
Software engineers
System architecture, API flows, and data pipelines, with version-controllable JSON you can commit alongside your code and diff in PR reviews.
Technical writers & docs teams
SVG exports that stay crisp in any doc platform, dark and light mode in sync, and read-only share links for seamless handoffs.
The details that make the difference.
Every small decision in Spayse is made with care, so you spend time designing instead of fighting the tool.
Subpixel Snapping
Nodes and shapes lock to a precise grid. Lines connect to exact port centers. No more nudging by eye.
Smart Color Schemes
Palettes optimized for screen, print, and dark/light mode. Every color tested for contrast and legibility.
Keyboard-First Workflow
Create nodes, wire connections, rename labels, entirely from the keyboard. Hands never leave the home row.
Version-Controllable JSON
Every diagram stores as readable, diffable JSON. Commit it, review it, roll it back, just like code.
True Vector Text
Text exports as real font curves, not bitmaps. Labels stay searchable and resolution-independent in any viewer.
Dark & Light in Sync
Design once. Spayse auto-generates both a dark-mode and a light-mode version, ready for docs, slides, or print.
Powerful enough for complexity. Simple enough for Tuesday.
Other tools make you choose between feature depth and usability. Spayse doesn't.
| Capability | Spayse | Figma | Eraser | Excalidraw | Draw.io |
|---|---|---|---|---|---|
Rich technical component library Flowcharts, arch diagrams, neural nets, pipelines… | |||||
Native LaTeX rendering KaTeX inline inside labels & arrows | |||||
Custom page / doc size guides Any dimensions + built-in presets | |||||
Vector PDF export (fonts embedded) Compiles cleanly in any doc | |||||
SVG export | |||||
Smart color presets Print-safe, legibility-tested palettes | |||||
Keyboard-first workflow | |||||
Version-controllable JSON format Git-diff friendly source format |