Architecture diagram

Architecture Diagram Generator

Quick Start: Create HTML structure with flexible layout (single/double/triple column) → Define CSS styles for layers and grids → Add content with categorized panels → Use semantic colors for different layers.

Critical Rules

Rule 1: Direct HTML Embedding

IMPORTANT: Write architecture diagrams as direct HTML in Markdown. NEVER use code blocks (```html). The HTML should be embedded directly in the document without any fencing.

Rule 2: No Empty Lines in HTML Structure

CRITICAL: Do NOT add any empty lines within the HTML architecture diagram structure. Keep the entire HTML block continuous to prevent parsing errors.

Rule 3: Incremental Creation Approach

RECOMMENDED: Create architecture diagrams in multiple steps:

1. First: Create the overall framework (wrapper, sidebars, main structure) and define all CSS styles
2. Second: Add layer containers with titles
3. Third: Fill in components layer by layer
4. Fourth: Add detailed content and refinements

Rule 4: Flexible Layout Structure

Architecture diagrams can use flexible layouts based on complexity:

• Single Column: Main content only (for simple architectures)
• Two Column: Main content + one sidebar (left or right)
• Three Column: Full layout with both sidebars (for complex systems)
  • Left Sidebar: Supporting systems (monitoring, operations, analytics)
  • Main Content: Core architecture layers (user, application, data, infrastructure)
  • Right Sidebar: Cross-cutting concerns (security, compliance, governance)

Rule 5: Layer-Based Organization

Each layer should have:

• Clear semantic meaning (User, Application, AI/Logic, Data, Infrastructure)
• Consistent color coding
• Grid-based layout for components
• Appropriate nesting for sub-components

Rule 6: Color Semantics

Use consistent semantic meaning for layers — the exact color palette varies by style (see examples). The standard semantic mapping:

• User Layer — user-facing interfaces and clients
• Application Layer — business logic and API services
• AI/Logic Layer — intelligence, rules, processing engines
• Data Layer — databases, caches, storage
• Infrastructure Layer — containers, networking, DevOps
• External Services — third-party APIs, cloud services (typically dashed border)

Style Examples

Choose a visual style that matches your project's tone and audience. Each example contains a complete, copy-ready HTML template. Voice is the style's typographic personality (system fonts only — no web-font loading); Context it serves is the audience it fits best.

See them all at once: open gallery.html in a browser — every style rendered side by side in its own isolated frame. Regenerate after editing any style with python3 scripts/build_gallery.py.

Export a diagram to PNG: python3 scripts/html_to_png.py <diagram.html | styles/name.md> -o out.png — renders via a headless browser, cropped tight at 2x. Auto-detects a backend: the Playwright package, else playwright-cli (Homebrew), else an installed Chrome/Chromium/Edge. See README.md.

#	Style	File	Voice	Context it serves
1	Steel Blue	styles/steel-blue.md	Georgia serif, blue-gray monochrome	Consulting reports, banking/finance, government projects, RFP proposals
2	Ember Warm	styles/ember-warm.md	Palatino book-serif, warm editorial	Retail/e-commerce, education platforms, lifestyle brands, cultural institutions
3	Neon Dark	styles/neon-dark.md	Monospace throughout, terminal / cyber	Tech talks, developer conferences, gaming platforms, cybersecurity dashboards
4	Stark Block	styles/stark-block.md	Arial Black uppercase, poster	Creative studios, education platforms, indie developers, tech blogs
5	Ocean Teal	styles/ocean-teal.md	Helvetica, airy coastal	Travel platforms, logistics/shipping, green tech, weather/ocean projects
6	Dusk Glow	styles/dusk-glow.md	Tight, heavy display sans	Social media, entertainment platforms, martech, content creation tools
7	Rose Bloom	styles/rose-bloom.md	Didot / Georgia italic, couture	Fashion/beauty, luxury brands, wedding platforms, premium memberships
8	Sage Forest	styles/sage-forest.md	Humanist sans, calm	Healthcare, agritech, clean energy, sustainability, bioinformatics
9	Frost Clean	styles/frost-clean.md	Sans titles + monospace data labels	Design tools, developer docs, API references, minimalist SaaS
10	Indigo Deep	styles/indigo-deep.md	Uppercase, wide-tracked sans	Brand-consistent systems, enterprise white papers, internal platforms
11	Pastel Mix	styles/pastel-mix.md	Rounded-friendly bold sans	SaaS products, startups, general tech architecture, product docs
12	Slate Dark	styles/slate-dark.md	Neutral Helvetica, dark mode	Enterprise dark mode, internal tools, developer dashboards

Layout Examples

Choose a layout structure that fits your architecture's complexity. Layouts use wireframe style (no colors) to focus on structural patterns. Combine any layout with any style above.

#	Layout	File	Best For
1	Three-Column	layouts/three-column.md	Complex systems with cross-cutting concerns and monitoring sidebars
2	Single Stack	layouts/single-stack.md	Simple services, microservice detail views, focused documentation
3	Left Sidebar	layouts/left-sidebar.md	Systems with operations/monitoring emphasis, DevOps-centric views
4	Right Sidebar	layouts/right-sidebar.md	Systems with security/compliance emphasis, governance-focused views
5	Pipeline	layouts/pipeline.md	Data pipelines, CI/CD flows, ETL processes, horizontal stage-based flows
6	Two-Column Split	layouts/two-column-split.md	Before/after comparisons, dual-system views, migration architecture
7	Dashboard	layouts/dashboard.md	System overviews with KPIs, monitoring dashboards, executive summaries
8	Grid Catalog	layouts/grid-catalog.md	Service catalogs, component libraries, equal-weight microservices
9	Banner + Center	layouts/banner-center.md	Gateway-centric architectures, user-facing systems with shared infrastructure
10	Nested Containers	layouts/nested-containers.md	Cloud deployments, VPC/network topology, environment isolation
11	Layer Layouts	layouts/layer-layouts.md	Per-layer layout patterns: grid, sub-group, product group, KPI, vertical stack, zones, inline pipeline, mixed width
12	Connectors	layouts/connectors.md	SVG overlay connectors between components: solid/dashed lines, arrows, labels, curved & orthogonal paths
13	Hub & Spoke	layouts/hub-spoke.md	Integration platforms, API hubs, event-driven architectures, ESB patterns

Advanced Features

NOTE: These advanced components require additional CSS styles. Add these to your <style scoped> section:

.arch-product-group { display: flex; gap: 10px; }
.arch-product { flex: 1; border-radius: 8px; padding: 10px; background: rgba(255, 255, 255, 0.6); border: 1px dashed #d97706; }
.arch-product-title { font-size: 12px; font-weight: bold; color: #92400e; margin-bottom: 8px; text-align: center; }
.arch-subgroup { display: flex; gap: 8px; margin-top: 8px; }
.arch-subgroup-box { flex: 1; border-radius: 6px; padding: 8px; background: rgba(255, 255, 255, 0.5); border: 1px solid rgba(0, 0, 0, 0.08); }
.arch-subgroup-title { font-size: 10px; font-weight: bold; color: #374151; text-align: center; margin-bottom: 6px; }
.arch-user-types { display: flex; gap: 4px; justify-content: center; margin-top: 6px; }
.arch-user-tag { font-size: 9px; padding: 2px 6px; border-radius: 10px; background: rgba(59, 130, 246, 0.15); color: #1d4ed8; }
/* SVG connector lines between components */
.arch-conn { stroke: #94a3b8; stroke-width: 1.5; fill: none; }
.arch-conn-dashed { stroke: #94a3b8; stroke-width: 1.5; fill: none; stroke-dasharray: 6 4; }
.arch-conn-label { font-size: 9px; fill: #64748b; font-family: sans-serif; }

Custom Product Groups

For complex applications with multiple products/modules:

<div class="arch-product-group">
  <div class="arch-product">
    <div class="arch-product-title">🎯 Product A</div>
    <div class="arch-grid arch-grid-2">
      <div class="arch-box">Feature 1<br><small>Description</small></div>
      <div class="arch-box highlight">Feature 2<br><small>Key Feature</small></div>
    </div>
  </div>
  <div class="arch-product">
    <div class="arch-product-title">📊 Product B</div>
    <div class="arch-grid arch-grid-2">
      <div class="arch-box">Feature 3<br><small>Description</small></div>
      <div class="arch-box">Feature 4<br><small>Description</small></div>
    </div>
  </div>
</div>

Sub-grouped Components

For detailed breakdowns within layers:

<div class="arch-subgroup">
  <div class="arch-subgroup-box">
    <div class="arch-subgroup-title">Component Group A</div>
    <div class="arch-grid arch-grid-3">
      <div class="arch-box tech">Service 1<br><small>Details</small></div>
      <div class="arch-box tech">Service 2<br><small>Details</small></div>
      <div class="arch-box tech">Service 3<br><small>Details</small></div>
    </div>
  </div>
  <div class="arch-subgroup-box">
    <div class="arch-subgroup-title">Component Group B</div>
    <div class="arch-grid arch-grid-2">
      <div class="arch-box tech">Service 4<br><small>Details</small></div>
      <div class="arch-box tech">Service 5<br><small>Details</small></div>
    </div>
  </div>
</div>

User Types/Tags

<div class="arch-user-types">
  <span class="arch-user-tag">Admin Users</span>
  <span class="arch-user-tag">End Users</span>
  <span class="arch-user-tag">API Clients</span>
  <span class="arch-user-tag">Partners</span>
</div>

Metrics and KPIs

<div class="arch-sidebar-item metric">99.9% Uptime</div>
<div class="arch-sidebar-item metric">&lt;200ms Response</div>
<div class="arch-sidebar-item metric">1M+ Users</div>

SVG Connectors Between Components

Use an SVG overlay to draw orthogonal (right-angle) connectors between components. Always use <path> with M/L commands for strictly horizontal and vertical segments. Do NOT use <line>, Bézier curves, or diagonal lines. See layouts/connectors.md for full reference.

<!-- Wrap diagram content in a relative container -->
<div style="position: relative;">
  <!-- ...layers and components here... -->
  <!-- SVG overlay as last child -->
  <svg style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible;">
    <defs>
      <marker id="arrowhead" markerWidth="8" markerHeight="6" refX="8" refY="3" orient="auto">
        <path d="M0,0 L8,3 L0,6" fill="none" stroke="#94a3b8" stroke-width="1"/>
      </marker>
    </defs>
    <!-- Orthogonal solid arrow (vertical → horizontal → vertical) -->
    <path d="M 200,72 L 200,90 L 400,90 L 400,108" class="arch-conn" marker-end="url(#arrowhead)"/>
    <!-- Orthogonal dashed line -->
    <path d="M 600,72 L 600,90 L 600,90 L 600,108" class="arch-conn-dashed" marker-end="url(#arrowhead)"/>
    <!-- Label -->
    <text x="420" y="86" class="arch-conn-label">data flow</text>
  </svg>
</div>

Styling Reference

Common Classes (shared across all styles)

• .arch-wrapper — flex container for sidebar + main layout
• .arch-sidebar — fixed-width sidebar column
• .arch-main — flexible main content area
• .arch-layer — layer container (add semantic class: .user, .application, .ai, .data, .infra, .external)
• .arch-box — component box; .arch-box.highlight for key items; .arch-box.tech for smaller tech items
• .arch-grid-2 to .arch-grid-6 — grid column layouts
• .arch-sidebar-panel — sidebar panel container
• .arch-sidebar-item — sidebar item; .arch-sidebar-item.metric for highlighted metrics

Best Practices

HTML Usage Guidelines

1. Direct embedding only — Always embed HTML directly in Markdown, never use ```html code blocks
2. No empty lines in structure — Keep the entire HTML block continuous without any empty lines
3. Incremental development — Build diagrams step by step:
   • Start with basic framework and layout structure (single/two/three column as needed)
   • Add empty layer containers with proper CSS classes
   • Fill in content layer by layer from top to bottom
   • Refine content and add highlights last

Architecture Design

1. Keep layers logically separated — Each layer should represent a clear architectural tier
2. Use consistent naming — Follow naming conventions for components and services
3. Highlight key components — Use .highlight class for critical components
4. Add technical details — Include technology stack info in <small> tags
5. Balance information density — Don't overcrowd components with text
6. Use icons sparingly — Add emojis to titles for visual hierarchy
7. Maintain color semantics — Stick to the established color meanings
8. Consider responsive design — Grids automatically adapt to content