Google Keep
Evernote
OneNote
Simplenote
Todoist
Standard Notes
Notion
Joplin
ChainMemory
Agentmemory
OpenMemory MCP
Pinecone
Memo.ai
Memori
cognee
MemoryLake
ChainMemory gives your AI agents persistent memory that belongs to YOU โ not to a single vendor.
Save a memory in ChatGPT, recall it in Claude or Gemini. Available via Chrome extension, MCP server (npm), or REST API. Every memory gets a cryptographic fingerprint and project states are anchored with Merkle proofs, so anyone can independently verify integrity โ no trust required.
Memories consolidate into a structured Project Brain (decisions, milestones, risks) instead of a pile of raw notes. Multi-agent native: Claude, Cursor and GPT share one consolidated state. Free tier available.
Google Keep
ChainMemoryGoogle Keep is recommended for individuals who need a basic, user-friendly note-taking tool without excess features. It is particularly beneficial for users who are frequent users of other Google services, as it offers seamless integration. It's an ideal choice for students, professionals, or anyone needing to keep quick, organized notes and lists.
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Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Agentmemory - Persistent memory for Claude Code, Codex & coding agents
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
OpenMemory MCP - Your private, local memory layer for all AI tools
Simplenote - The simplest way to keep notes. Light, clean, and free. Simplenote is now available for iOS, Android, Mac, and the web.
Pinecone - Search through billions of items for similar matches to any object, in milliseconds. Itโs the next generation of search, an API call away.