HASH vs Protégé

HASH is an open-source platform that models an organization with a knowledge graph and a process graph. The continuously updated model supports analytics, workflow automation, what-if simulations, AI agents, and detailed access governance. HASH can ingest connected applications and structured data, infer entities from unstructured material, and passively collect selected web information. Its bitemporal graph records transaction time and decision time, letting users inspect earlier states and provenance without overwriting records. Flows combine triggers, actions, filters, and waits and can run manually, automatically, or programmatically. Agents can answer questions and take actions. Integrations include Slack, Google Drive, Gmail, Notion, GitHub, SAP S/4HANA, Snowflake, and Postgres. Two-way synchronization is available where supported; some services allow only read-only sync or one-time imports. A browser extension can collect selected browsing information, let agents access sites for users, and launch flows. HASH is offered through web, API, browser extension, or self-hosted deployment. The free plan includes 10GB storage and 50 entities per manual scraping job. Plus starts at $20 a month when billed annually.

Protégé is a free ontology editor for building and managing ontologies, offered as Protégé Desktop and the browser-based WebProtégé. Both editions support OWL 2 and are described as cross-compatible. WebProtégé supports collaborative viewing and editing, with sharing, permissions, threaded discussions, watches, email notifications, and revision history. Ontologies can be uploaded and downloaded in formats including RDF/XML, Turtle, OWL/XML, and OBO. Protégé Desktop connects directly to description logic reasoners such as HermiT and Pellet. It can keep multiple ontologies in one workspace and provides structure visualization, inference explanations, and refactoring operations. Desktop is written in Java and can be extended with plug-ins. The project provides documentation including FAQs, tutorials, user guides, and developer documentation. Free support is available through mailing lists monitored by team members and experienced community users; users must subscribe before posting. The project says researchers, organisations, and governments worldwide use Protégé. Desktop is community maintained, with Damien Goutte-Gattat identified as its current primary maintainer.