Empress

Empress describes itself as a behavioral-measurement substrate: an immutable, multi-tenant ledger for what agents, users, and systems do. Its tagline — "Behavior, measured. Evidence, kept." — sums up the goal of turning real usage into durable, verifiable records rather than dashboards built on approximations.

The technical core is the xAPI ledger. xAPI is a widely used format for expressing activity as statements, and Empress uses those statements as its unit of record. Because the ledger is immutable and multi-tenant, teams can write behavioral data into a shared substrate that cannot be quietly rewritten, which makes the resulting evidence trustworthy for measurement, auditing, and longitudinal comparison.

Empress fits organizations that want to understand how AI agents, end users, and internal systems actually behave in production, and to keep proof of that behavior. Access is currently request-based: visitors submit an email address to request access, and detailed documentation is shared with prospective users rather than published openly.