Every AI conversation starts from zero. Your projects, decisions, and preferences disappear as soon as you close the chat. Second Brain fixes that. It is a self-hosted memory layer that works with Claude, ChatGPT, Cursor, and any MCP client. You can store context once and recall it by meaning instead of keywords. It includes duplicate detection, semantic search, and a web UI. Built on Cloudflare, it offers a free tier and your data remains yours. MIT licensed.
This is the 2nd launch from Second Brain for AI. View more
Second Brain for AI v2
Launching today
Second Brain remembers your projects, people, decisions, and preferences across Claude, ChatGPT, Cursor, Codex, and any MCP client. V2 automatically links related memories, follows those connections during recall, and distinguishes settled decisions from drafts and stale context. Open source and self-hosted in your Cloudflare account.
Free
Launch Team / Built With
Foyer
What is the diff with a simple obsidian vault?
Second Brain for AI
@fberrez1 Obsidian is notes you write for yourself. This is memory AI tools write automatically across Claude, ChatGPT, and Cursor, recalled by meaning rather than keyword search.
This solves a problem I hit constantly as a solo maker. I'm building a small Mac app + re-explaining architecture decisions, naming conventions, and "why we did it this way" every time a session resets gets old fast.
The canonical vs. draft distinction is the part that stands out to me. Most memory tools I've tried just let the newest note win, which is actually worse than no memory when two sessions disagree. Curious how it behaves for a single-developer, multi-tool setup like mine specifically; is there any overhead to set up for someone who isn't running a team, or is the self-hosted Cloudflare piece basically "connect once and forget about it"?
One thing I noticed: there's no simple hosted webpage to just sign up and go — it looks like setup is done directly through git/deploying to your own Cloudflare account. Was that a deliberate choice to keep it self-hosted and avoid managing user data yourselves, or is a simpler no-code setup on the roadmap for people who aren't comfortable with git?
Also: does it pick up context automatically as I work, or do I need to explicitly tell it "remember this" for a decision to stick?
Nice to see self-hosted taken seriously here rather than another tool that wants my data in someone else's cloud.
Finally something that solves the most frustrating part of using AI. Plugged it into Claude and Cursor and the recall by meaning actually works, way better than digging through old chats. Love that it's self-hosted too.
Second Brain for AI
@phardinghy4670 The recall-by-meaning piece was the hardest to get right. Glad it's landing as actually useful rather than just technically interesting.