ultramemory
Structured AI agent memory with temporal versioning, relational tracking, and semantic search. Use when storing facts, recalling context, searching past conversations, tracking how knowledge changed over time, or building entity profiles. Replaces flat MEMORY.md with atomic fact extraction, update/contradict/extend relations, and hybrid semantic+temporal search. Use for any "remember this", "what do I know about X", "when did this change", or cross-session knowledge retrieval.