MemPalace is an open-source tool that stores and retrieves verbatim conversation history on your machine using semantic search and a pluggable vector-store backend. It supports ChromaDB, SQLite exact vectors, Qdrant, and pgvector, and ships a CLI and Docker images for easy setup without external APIs. Benchmarks show 96.6% recall at top-5 on LongMemEval with zero cloud or LLM calls.

• 96.6% recall at top-5 on LongMemEval with zero cloud or LLM calls, rising to 98.4% with hybrid keyword/temporal boosting and ≥99% with LLM rerank
• Runs fully local by default (verbatim storage, semantic search, ChromaDB/SQLite/Qdrant/pgvector options) so nothing leaves your disk unless you opt into a remote backend
• Also benchmarked at 60.3% R@10 on LoCoMo (88.9% with hybrid v5) and 80.3% R@5 on MemBench
• Ships as CLI, Docker (CPU/GPU) images, and an MCP server for direct integration with tools like Claude Code