MemPalace: Open-Source AI Memory System Hits 51K Stars in First Month — 96.6% on LongMemEval

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MemPalace, an open-source AI memory system using method-of-loci architecture, has reached 51K stars since launching April 5, 2026. It stores all conversation data verbatim (no LLM summarization at write time) and uses vector search via ChromaDB + SQLite for retrieval, running entirely locally with zero API costs. Claims 96.6% raw and 98.4% R@5 on LongMemEval benchmark. Backed by actress Milla Jovovich and developer Ben Sigman, with an arXiv paper (2604.21284) analyzing the spatial metaphor approach.