LibreAI / AI Chat / smart-second-brain
// ai-chat ยท s2b-dev/smart-second-brain

smart-second-brain

Free, open source Obsidian add-on that makes your vault sharper.

๐Ÿ’Ž Hidden gemโ˜… 1.3k starsโ‘‚ 121 forksMITupdated 2026-09
โ–ฆ visual โ€” this project's README ships no embeddable screenshot,
so here's a placeholder. The guide below is complete regardless.
// project facts

Project facts

smart-second-brain is an open-source ai chat project by s2b-dev (s2b-dev/smart-second-brain on GitHub). It has 1,305 GitHub stars and 121 forks, is released under the MIT license, and was last updated on GitHub on 28 September 2026.

GitHub stars
1,305
Forks
121
License
MIT
Last updated on GitHub
28 September 2026
Category
AI Chat
Listing
Hidden gem โ€” a shorter page for a lesser-known project
Official site
Official site
// how it works

How it works

  1. Check for updates

    Pull the latest changes to stay current with fixes.

  2. Follow the quickstart

    The README documents setup; start with the install section.

  3. Make it yours

    Change the config to match your workflow, then run it daily.

  4. Pick your use case

    Decide what you want smart-second-brain to do first โ€” free, open source Obsidian add-on that makes your vault sharper: riche.

// features

Why people love it

Agent support

Coordinates multi-step agent behavior.

Local-first design

Your data stays on your machine.

Obsidian add-on

Plugs straight into your Obsidian vault.

Retrieval-augmented answers

Grounds output in your own documents.

TypeScript codebase

Typed code that is easier to maintain.

MIT license

Use it freely, even commercially.

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// run it

Run it yourself

  1. Step 1 โ€” Clone the repo

    Download the source and move into the project folder.

    git clone https://github.com/s2b-dev/smart-second-brain.git
    cd smart-second-brain
  2. Step 2 โ€” Install

    Install the Node dependencies.

    npm install
  3. Step 3 โ€” Run it

    Start the app or dev server.

    npm start
// use cases

What you can build

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// faq

Questions, answered

Is smart-second-brain free to use?

Yes. It is MIT licensed, so you can use it freely, including commercially, with attribution.

Do I need an account to use smart-second-brain?

No. It is a self-run project โ€” clone it and run it on your own machine. Some features may optionally call external APIs; check the README.

Can I run smart-second-brain on my own hardware?

Yes, that is the point. The code is public, so you can run, modify, and host it yourself.

How is smart-second-brain licensed?

It is released under MIT. Read the LICENSE file in the repo for the exact terms.

Can I use it for a client project?

Yes. It is MIT licensed, so you can use it freely, including commercially, with attribution.

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// alternatives

Alternatives in AI Chat

The most-starred other AI Chat projects in the LibreAI catalogue โ€” the realistic shortlist if smart-second-brain is not the right fit.

Get smart-second-brain

Free and open โ€” grab the source, star the repo, and start creating.