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ChainMemory
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OpenMemory MCP
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Memo.ai
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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.
Startup Notes
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Better Notes - Simple notes app that ties notes together with #hashtags
Agentmemory - Persistent memory for Claude Code, Codex & coding agents
Whimsical - The visual workspace for teams.
OpenMemory MCP - Your private, local memory layer for all AI tools
Great F*cking Startup Advice - Strongly worded suggestions for startup founders
Pinecone - Search through billions of items for similar matches to any object, in milliseconds. Itโs the next generation of search, an API call away.