Productivity
obsidian-second-brain
Persistent memory for Claude Code and other CLI agents, stored as plain Markdown in your Obsidian vault
★ 4.7k starsMIT
View guide →Open Brain (OB1): one database, one AI gateway, one capture channel — shared memory for every AI you use
OB1 is an open-source productivity project by NateBJones-Projects (NateBJones-Projects/OB1 on GitHub). It has 4,701 GitHub stars and 893 forks, is released under the NOASSERTION license, and was last updated on GitHub on 8 October 2026.
Read the overview: one database, one AI gateway, one chat channel, and an MCP server that any AI can plug into.
Clone the repo and build the full system with the Setup Guide (or the AI-assisted setup with Cursor/Claude Code) — database, gateway, Slack capture, and MCP server.
Attach Claude, ChatGPT, Cursor, or Claude Code to the same brain via the remote MCP connection.
Start capturing thoughts through Slack, then build Extension 1 (Household Knowledge Base) and import old data with Recipes.
A single database with vector search that every connected AI reads and writes, instead of per-tool memory silos.
Capture thoughts where you already chat; companion prompts help build the capture habit and migrate existing memories.
Any MCP-capable client can connect, and a Shared MCP Server primitive lets you give others scoped access to parts of your brain.
A learning path that builds a household knowledge base, maintenance tracker, family calendar, meal planner, professional CRM, and job-hunt pipeline.
Community-reviewed recipes import ChatGPT, Perplexity, Obsidian, X/Twitter, Instagram, Google Takeout, Grok, and email history with parsing, deduplication, and embedding included.
Community SvelteKit and Next.js dashboards point at your Supabase backend, and a Kubernetes recipe offers a fully self-hosted deployment with PostgreSQL + pgvector, no Supabase required.
Clone the project and enter its directory.
git clone https://github.com/NateBJones-Projects/OB1.git
cd OB1Build the full system — database, AI gateway, Slack capture, MCP server — using the repo's Setup Guide (about 45 minutes per the README).
# see the Setup Guide linked from the README for the exact stepsUse the Remote MCP Connection primitive in the repo docs to connect Claude Desktop, ChatGPT, Claude Code, or Cursor to your brain.
# see the 'Remote MCP Connection' primitive doc in the repoNate B. Jones created Open Brain; a maintainer team reviews and merges a large volume of community Extensions, Recipes, skills, and dashboards.
The repository is open (license not asserted in its metadata). The reference setup runs on Supabase and an AI gateway, so you may pay for those services' tiers and your own model usage.
You will need accounts/keys for the pieces you assemble — typically Supabase plus an LLM provider for the gateway and embeddings — as detailed in the Setup Guide.
Those are apps for humans; OB1 is infrastructure — a database with vector search and an open MCP protocol whose purpose is that every AI you use shares one persistent memory. (There is even a Recipe to import an Obsidian vault into it.)
Clone the repo and follow the Setup Guide (or the AI-Assisted Setup), then connect your first AI client over MCP and pick Extension 1.
Persistent memory for Claude Code and other CLI agents, stored as plain Markdown in your Obsidian vault
Open-source Sunsama alternative: daily planner AI can actually use.
An AI coworker with long-lived memory and multiplayer collaboration spaces
Local LLM workhorse that keeps a memory of your workday.
Memos — a personal timeline for quick notes: capture short memos in seconds, find them later by search, tag or date; open source and self-hosted
Capture first, organize later: a local-first Markdown app that turns scattered records into notes with AI.
The most-starred other Productivity projects in the LibreAI catalogue — the realistic shortlist if OB1 is not the right fit.
Real-time global intelligence dashboard: AI news aggregation, geopolitics and infrastructure tracking
Memos — a personal timeline for quick notes: capture short memos in seconds, find them later by search, tag or date; open source and self-hosted
Joplin — the privacy-focused note-taking app: Markdown notes and to-dos on every platform, offline-first, with end-to-end encrypted sync you control
Open-source personal AI assistant & Agent Harness. Plans tasks, runs tools and skills, self-evolves with memory and knowledge. Multi-agent, multi-model, mult…
Logseq — a privacy-first platform for knowledge management: an outliner over your local Markdown files, with a graph, journals and spaced repetition built in
Free and open — grab the source, star the repo, and start creating.