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ontosphere

Active·★ 61·NOASSERTION·Updated 2026-05-22
★ Trending★ RAG / Knowledge Base★ Observability

Browser-based RDF/ontology knowledge graph editor — load RDF from files, URLs or SPARQL endpoints; author nodes and edges on the canvas; run OWL-RL reasoning; apply multi-algorithm layout and clustering. AI-native via MCP tool surface and relay bridge. Fully client-side, no backend required.

Ontosphere is a browser-based RDF/ontology knowledge graph editor that loads RDF from files, URLs, or SPARQL endpoints, allows users to author nodes and edges on a canvas, runs OWL 2 DL reasoning with visual differentiation of inferred triples, and supports multi-algorithm layout and AI-agent integration via the Model Context Protocol.

#fair-data#graph-editor#json-ld#knowledge-graph#linked-data#mcp#mcp-servers#model-context-protocol
$ Install
$ npm install && npm run dev
↗ Visit site★ GitHub
01

Features

01Load RDF/Turtle/JSON-LD/RDF-XML/N-Triples from local files or remote URLs
02Author nodes and edges directly on the canvas with undo/redo
03Multi-algorithm layout (Dagre, ELK) with automatic clustering
04OWL 2 DL reasoning via Konclude with visual inferred triples
05Model Context Protocol (MCP) server for AI-agent integration
02

Compatibility

Chrome
Chrome
Verified via docs
Firefox
Firefox
Verified via docs
Safari
Safari
Verified via docs
Edge
Edge
Verified via docs
03

Quick start

1
$ npm install
2
$ npm run dev
04

Use cases

↳Building and maintaining knowledge graphs
↳Ontology reasoning and validation
↳AI-driven graph construction and editing
05

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Related searches

ontosphere AlternativesBest Browser Automation Tools 2026Open Source Browser Automationontosphere Tutorialontosphere Vs Competitorsfair-datagraph-editorjson-ld

Comments

Log in to leave a comment
  • S
    Sage WilsonApr 5, 2026

    Browser-based RDF/ontology editor with AI assistance is a niche but valuable tool

  • J
    Justice MartinezApr 1, 2026

    Used for knowledge engineering workflows, the ontology visualization is clear

  • E
    Emerson BrownMar 3, 2026

    Loading RDF from URLs and querying it conversationally is much more accessible than SPARQL

On this page
01Features02Compatibility03Quick start04Use cases05Alternatives
Stats
GitHub Stars★ 61
Last commit1w ago
StatusActive
LicenseNOASSERTION
CategoryBrowser Automation
Trend (30d)
+2.4↑ 0.7%
Links
Documentation↗Discussion↗Issues↗Releases↗

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