MemPalace/mempalace at 52.4K Stars: Local-First AI Memory System Posts 96.6% Recall@5 on LongMemEval Without Any API Calls

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MemPalace stores conversation history verbatim (no summarization lossy compression) and indexes it using a spatial metaphor — 'wings' for people/projects, 'rooms' for topics, 'drawers' for content. It leads LongMemEval retrieval recall at 96.6% R@5 raw (98.4% hybrid, 99%+ with LLM reranking), with strong results on LoCoMo (60.3%), ConvoMem (92.9%), and MemBench (80.3%). Ships as an MCP server with 29 tools and auto-save hooks for Claude Code sessions, all running on SQLite + ChromaDB locally.