Best agent memory AI tools

llongterm is a developer-focused API providing persistent, long-term memory for AI applications and agents. It enables AI to remember user interactions over years, creating structured, human-readable knowledge maps for truly personalized and context-aware experiences.

Zep is a context engineering platform for developers building AI agents. It provides long-term memory and advanced Graph RAG capabilities, enabling agents to recall user preferences, conversation history, and dynamic business data. By automatically constructing temporal knowledge graphs, Zep delivers relevant, token-efficient context to LLMs, resulting in faster, more accurate, and highly personalized AI interactions.