Covalence is a Mac application designed to solve the problem of fragmented context among different AI tools. It integrates an MCP server with a local vector database into a single package, enabling seamless sharing of memories between AI applications like Claude Desktop and Cursor without requiring external databases or cloud accounts. The app uses SQLite for data storage and CoreML for embedding text locally, ensuring no API keys or network calls are needed. Key features include persistent 'Core Memories' that the AI always remembers, separate memory contexts called 'Spaces', and global hotkey capture for easy context management. Covalence supports concurrent access from multiple sessions without deadlocks, thanks to SQLite's WAL mode. The app is free with no usage limits and requires macOS 15+.