Agent memory developer tools
Every listing tagged memory, A to Z: 8 tools across 2 categories. Listed in alphabetical order, not ranked.
DocuMemory
Memory engine for AI-first engineers: distils Claude Code, ChatGPT and Cursor sessions into architecture decisions and prompt-injectable context blocks, recalled over MCP or a REST API; 15 free distillations, then from $10/month.
Dropstone
AI coding agent for the terminal and your IDE with one memory across chat, CLI and code: correct it once and it applies the lesson everywhere; runs on self-hosted models, plans from $5/month.
Letta
Stateful agents with memory that persists and improves with experience, from the makers of MemGPT: Letta Code ships a terminal UI, an app server for self-hosted agents and an Agent SDK, with Letta Cloud to carry memory across machines. Open source (Apache-2.0); free with your own API keys, Pro $20/month.
Maximem Synap
Memory and context layer for AI agents with entity resolution, temporal reasoning and scoping built in, sub-15ms recall, a hosted MCP endpoint and native adapters for 23 agent frameworks including LangChain and the Claude Agent SDK; free tier, paid from $19/month.
Mem0
Memory layer for AI agents and apps: send it conversations and it extracts, updates and retrieves the memories that matter for each user, through Python and Node SDKs, an API, MCP and a CLI. Open source (Apache-2.0) as a library or self-hosted server, or the hosted platform with a free plan.
Skillsync
Mac app and CLI that searches all your past coding-agent sessions before each prompt and hands your agent a short recollection with sources; works with Claude Code, Codex, Cursor, OpenCode, Amp and more, indexes locally, with shared team workspaces.
Supermemory
Memory and context engine for AI agents: learns from each user's chats, files and URLs, stores it in a vector-graph database and injects what matters into your agent's context, through an API, MCP and plugins for Claude Code, Cursor and more. Open source (MIT); hosted free plan with $5 of credits a month, Pro $19/month.
Zep
Context and memory layer for AI agents: turns conversations, documents and business data into a temporal Context Graph per user, account or domain, with dated facts traced to their source and retrieval under 200 ms. Zep Cloud, your own encryption keys or your VPC; its graph engine Graphiti is open source (Apache-2.0). Free 10,000 credits a month.