Interactive ontology editor and visualizer with TTL file support.
- Layout styles – Hierarchical (weighted) or force-directed
- Editing – Visually add/remove nodes (classes) and edges (object properties) rename classes, add data relationships, undo/redo, ...
- Nodes and edges styling based on rules: font size, line colour
- Search – Filter by node label or relationship type
- Relationships filters – Show/hide by relationship type
| Tool | Pros | Cons |
|---|---|---|
| OntoCanvas | Hierarchical view – clear tree layout for class hierarchies; simple fast edits – add/remove nodes and edges, rename, undo/redo; browser-based, no install; direct TTL load/save; lightweight, no server | Limited OWL expressivity; no reasoner; no SPARQL; focused on class hierarchy + relationships |
| Protégé / WebProtégé | Industry standard; full OWL support; reasoner integration; plugins; collaborative (WebProtégé) | Not very visual; steep learning curve; heavy; form-based, not graph-first |
| Onto4ALL | Browser-based; box-and-arrow visual; simple | Limited features; basic editing; not widely maintained |
| OWLGrEd | UML-style diagrams; good for drawing class diagrams; OWL export | Desktop app; less interactive; diagram-first, not live graph |
| VocBench 3 | Web-based; strong for SKOS; light OWL; validation | Focused on vocabularies, not full ontology modeling |
| metaphactory | Commercial KG platform; visual ontology modeling; enterprise features | Paid; heavyweight; requires setup |
| GraphDB Workbench | Triplestore UI; graph visualisation; SPARQL; query results as graph | Editor is secondary; not designed for ontology authoring |
| LinkedDataHub | Low-code RDF/KG; forms + graph views; flexible | Complex setup; more data than schema oriented |
| yEd + manual export | Generic graph editor; flexible layout; familiar | No ontology semantics; manual translation to TTL; no round-trip |
| TopBraid Composer | Full OWL; visual + form; SPARQL; Eclipse-based | Commercial; desktop; heavyweight |
| Semaforer | Lightweight; web-based; simple | Limited scope; less mature |
| Neon | OWL 2; ontology evolution; change tracking | Research tool; less mainstream |
When to use this editor: You want a quick, visual way to browse and tweak an ontology (especially class hierarchies and relationships) without installing anything, with direct TTL file round-trip and undo/redo.
- Vite – Build tool
- TypeScript – Type safety
- N3.js – Turtle/RDF parsing (client-side)
- vis-network – Graph visualization
npm installnpm run devOpen http://localhost:5173 in your browser.
npm run buildOutput is in dist/. Deploy the contents to any static host (e.g. GitHub Pages).
npm run test # Run tests once
npm run test:watch # Run tests in watch modeTests cover load (parse), edit (label update), save (serialize), and round-trip consistency with E2E tests.