AgentIndex icon
AgentIndex
open-ontologies logo
open-ontologies
★ 1.2k
vs
hippocampus logo
hippocampus
★ 13

open-ontologies vs hippocampus

open-ontologies: Open Ontologies is a Rust MCP server and desktop Studio for AI-native ontology engineering. It provides 48 tools to build, validate, query, diff, lint, version, reason, align, and persist RDF/OWL ontologies using an in-memory Oxigraph triple store. It features Terraform-style lifecycle management, a marketplace of 30 standard ontologies, clinical crosswalks, semantic embeddings, and a full lineage audit trail.; hippocampus: Hippocampus is an open-source, self-hosted MCP memory server that provides persistent, cross-platform memory for AI assistants. Deploy once and connect to multiple AI platforms such as Claude, ChatGPT, Gemini, Cursor, and Perplexity, enabling them to share and recall context seamlessly. It uses a knowledge graph with local embeddings and encrypts the database at rest.

01

TL;DR

open-ontologies logo
open-ontologiesMemory & Context · ★ 1.2k

Build and validate domain ontologies from natural language instructions using Claude

Read open-ontologies full review →
hippocampus logo
hippocampusMemory & Context · ★ 13

Store and recall personal preferences across different AI assistants

Read hippocampus full review →
02

Side-by-Side Comparison

Field
open-ontologies logoopen-ontologies
hippocampus logohippocampus
Category
Memory & Context
Memory & Context
Stars
★ 1.2k
★ 13
License
MIT
AGPL-3.0
Install Command
git clone https://github.com/fabio-rovai/open-ontologies.git && cd open-ontologies && cargo build --release
git clone https://github.com/karrolcia/hippocampus.git && cd hippocampus && npm install && cp .env.example .env && npm run dev
Updated
6d ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
ai-native, claude, description-logics
ai, chatgpt, claude
03

Features

open-ontologies logoopen-ontologies
0148 tools for ontology engineering (validate, load, query, diff, lint, reason, align, etc.)
02In-memory Oxigraph triple store with SPARQL 1.1 support
03Terraform-style lifecycle management (plan, apply, drift, enforce, monitor)
04Desktop Studio with 3D force-directed graph, AI chat, and property inspector
05Marketplace of 30 standard ontologies with clinical crosswalks and embeddings
hippocampus logohippocampus
01Cross-platform memory sharing across major AI tools via MCP protocol
02Knowledge graph storage with entities, observations, and relationships
03Semantic search using local embeddings (all-MiniLM-L6-v2)
04AES-256 database encryption via SQLCipher, including embedding vectors
05Self-contained OAuth 2.1 authentication with PKCE
04

Use Cases

open-ontologies logoopen-ontologies
↳Build and validate domain ontologies from natural language instructions using Claude
↳Manage ontology versions and drift detection in CI/CD pipelines
↳Align and crosswalk clinical codes (ICD-10, SNOMED, MeSH) to research ontologies
hippocampus logohippocampus
↳Store and recall personal preferences across different AI assistants
↳Maintain project context and decisions when switching between AI tools
↳Avoid repeating information when using multiple AI platforms simultaneously
05

Best For

open-ontologies logoopen-ontologies
Trending
hippocampus logohippocampus
—
FAQ

FAQ

What is the difference between open-ontologies and hippocampus?
Both open-ontologies and hippocampus are in the Memory & Context category. open-ontologies has 1.2k stars, while hippocampus has 13 stars.
Which is better, open-ontologies or hippocampus?
The best choice depends on your use case. Choose open-ontologies if Build and validate domain ontologies from natural language instructions using Claude, and hippocampus if Store and recall personal preferences across different AI assistants.
Is open-ontologies free or open source?
Yes, open-ontologies is open source on GitHub (MIT).
Is hippocampus free or open source?
Yes, hippocampus is open source on GitHub (AGPL-3.0).
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