ontosphere

by ThHanke · TypeScript · ★ 145

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.

#fair-data#graph-editor#json-ld#knowledge-graph#linked-data#mcp#model-context-protocol#ontology#owl#rdf#reactodia#reasoning#semantic-web#sparql#turtle#visualization

Install

npx -y github:ThHanke/ontosphere

Auto-generated from the repo's primary language — check the repo's own README for its exact install instructions.

Claude Desktop config

A starting point for your claude_desktop_config.json (auto-generated — the repo's README may specify a published package name or required env vars):

{
  "mcpServers": {
    "ontosphere": {
      "command": "npx",
      "args": [
        "-y",
        "github:ThHanke/ontosphere"
      ]
    }
  }
}

From the README

Ontosphere — Browser-based RDF Knowledge Graph Editor ==================================================== [](https://doi.org/10.5281/zenodo.19605270) [](LICENSE) | I want to… | Start here | |------------|------------| | Try the live demo | [Open Ontosphere ↗](https://thhanke.github.io/ontosphere) | | Watch feature tutorials | [Video tutorials](#video-tutorials) | | Learn the interface | [Using the UI](#using-the-ui) | | Connect an AI agent | [AI / MCP Integration](#ai--mcp-integration) | | Load my own data | [Startup / URL parameters](#startup--url-parameters) | | Run it locally | [Quick st…

Read full README on GitHub →

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