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s2b-dev/smart-second-brain

A free, open-source Obsidian plugin adding semantic search, a topic-grouping knowledge graph, and an AI agent that works with your notes.

Open-source alternative to:Obsidian Smart Connections

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Last commit
25 days ago

What is it?

Smart Second Brain is an Obsidian plugin that improves how you find and explore notes in your vault. Its search combines keyword matching with meaning, so it can surface a note you were thinking of even when the wording differs from what you typed.

The Smart Graph groups notes into topics based on their links, tags, and content, without requiring manual maintenance. The AI agent can read and write notes, draw live charts and dashboards from them as widgets, and use skills, memory, MCP, and integrations with other Obsidian plugins. Search and the graph work without any configuration; adding an embedding model enables semantic search and content-based topics, and adding an AI provider enables the agent.

By default, data stays on your machine, and notes are only sent to the AI or embedding providers you configure. The plugin runs on desktop and mobile and is released under the MIT license.

Key features

  • 01Search that combines keyword matching with semantic meaning.
  • 02Smart Graph that automatically groups notes into topics from links, tags, and content.
  • 03AI agent that reads and writes notes within your vault.
  • 04Live charts and dashboards drawn from notes as widgets.
  • 05Supports skills, memory, MCP, and integrations with other plugins.
  • 06Works on desktop and mobile Obsidian.

Use cases

  • Finding forgotten notes in a large vault by meaning rather than exact keywords.
  • Exploring how the topics in a personal knowledge base relate to each other.
  • Asking an AI assistant questions answered from your own notes.
  • Building live dashboards that summarize data stored across notes.

Quick start

  1. 1

    Install Smart Second Brain from Obsidian's community plugins

  2. 2

    Enable the plugin; search and Smart Graph work with no configuration

  3. 3

    Optionally add an embedding model and an AI provider to unlock semantic search and the agent

Things to know

  • The full agent requires connecting an AI provider.
  • The project is developed in spare time and describes itself as experimental.
  • Much of the code is written with AI coding agents.

In collections

Open-source AI agent frameworks & appsPrivacy & local-first tools

Topics

#obsidian-plugin#semantic-search#knowledge-graph#rag#ai-agents#local-first#note-taking#ai#obsidian#obsidian-md

FAQ

What is smart-second-brain?
A free, open-source Obsidian plugin adding semantic search, a topic-grouping knowledge graph, and an AI agent that works with your notes. Smart Second Brain is an Obsidian plugin that improves how you find and explore notes in your vault. Its search combines keyword matching with meaning, so it can surface a note you were thinking of even when the wording differs from what you typed.
Is smart-second-brain free to use? What license does it have?
smart-second-brain is open source under the MIT license. Check the license terms before using it in commercial products.
Is smart-second-brain still maintained?
Actively maintained. The last commit to smart-second-brain was on Oct 13, 2026.
What can I use smart-second-brain for?
Finding forgotten notes in a large vault by meaning rather than exact keywords. Exploring how the topics in a personal knowledge base relate to each other. Asking an AI assistant questions answered from your own notes. Building live dashboards that summarize data stored across notes.
How do I install smart-second-brain?
Install Smart Second Brain from Obsidian's community plugins Enable the plugin; search and Smart Graph work with no configuration Optionally add an embedding model and an AI provider to unlock semantic search and the agent
Where can I get smart-second-brain?
The source code and installation instructions are on GitHub: https://github.com/s2b-dev/smart-second-brain

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