Built on open source.

Renders the Mermaid engine. We bundle Mermaid 11 directly.

Renders the PlantUML engine. We do NOT bundle PlantUML; we proxy to the official public server at plantuml.com.

Graphviz DOT rendering compiled to WebAssembly.

Grammar-of-graphics charts.

Publication-quality scientific + 3D + 4D plots.

Sketchy UML / whiteboard diagrams.

Digital timing diagrams + register bit-fields.

LaTeX math typesetting.

2-D molecular structures from SMILES.

Interactive 3-D molecular visualisation.

Network / graph visualisation.

BPMN 2.0 modeler (Camunda). MIT terms plus one extra condition: the bpmn.io watermark linking back to bpmn.io must stay fully visible in rendered diagrams.

bpmn-js-properties-panel, @bpmn-io/properties-panel, camunda-bpmn-js-behaviors, zeebe-bpmn-moddle, bpmnlint and bpmnlint-loader.

Mermaid's ELK-based layout engine.

WebGL 3D engine.

Node-based UI framework for the Weave canvas.

Mindmaps from Markdown bullets.

Rust-based SVG → PNG rasteriser used server-side.

The Eclipse Layout Kernel compiled to JavaScript. Lazily imported (elk.bundled.js) so the ~150KB cost is only paid on first auto-layout.

Mozilla's PDF renderer. Text extraction runs entirely in the browser — no PDF is uploaded to our servers.

XSS sanitiser for HTML and SVG.

Runs the Kokoro-82M speech model in the listener's browser. The text being read never reaches our servers.

The voice model itself, by hexgrad. Downloaded once by the listener's browser from the Hugging Face CDN and cached locally — we do not redistribute the weights.

@huggingface/transformers runs the ONNX model in WebGPU/WASM; phonemizer turns text into phonemes.

VS Code's editor in the browser.

React framework + Vercel deployment target.

UI library.

Utility-first CSS.

Icon set.

State management.

CSV parsing.

URL-safe compression.

Client-side PDF generation.

DOM → PNG.

Client-side encoder for PlantUML URLs.

Pictogrammers' Material Design Icons, bundled via @iconify-json/mdi.

Paweł Kuna's Tabler set, bundled via @iconify-json/tabler.

Phosphor Icons core set, bundled via @iconify-json/ph.

Resolve to Save Lives' public-health icon set, bundled via @iconify-json/healthicons.

Remix Design's icon set, bundled via @iconify-json/ri.

IBM's Carbon Design System icons, bundled via @iconify-json/carbon.

Lucide Contributors' icon set, bundled via @iconify-json/lucide.

Dave Gandy / Fort Awesome. The one bundled pack whose license requires attribution wherever its icons are used — if you publish artwork containing fa6-solid icons, credit Font Awesome alongside it.

Free public icon API providing 200,000+ icons across hundreds of collections (Healthicons, MDI, Tabler, Logos, Simple-Icons, Noto, Lucide, etc.).

Generates diagrams from natural-language descriptions, refines them iteratively, explains errors, restyles to journal palettes, converts to LaTeX/TikZ.

Alternative AI provider — handles diagram generation, refine, vision (Photo → Engine).

Postgres + Auth + Realtime + Storage backbone. Stores profiles, plans, cloud-synced workspaces, API keys, encrypted BYOK, audit log.

GitHub + Google OAuth sign-in with cookie-based sessions; no password storage.

Billing for Starter and Plus plans — checkout sessions, webhooks, customer portal.

Cross-container rate-limit storage when configured. Falls back to in-memory.

TypeScript client for the Anthropic API.

TypeScript client for the OpenAI API.

Server SDK for checkout, portal and webhook verification.

Node's HTTP client, used for outbound fetches with explicit timeouts.

YAML parser / stringifier.