Second Brain
AI visual board and knowledge base
391 followers
AI visual board and knowledge base
391 followers
Second Brain allows you to AI chat with anything on a Visual Board — you can drop as much context and chat nodes as you want. Over time, you build a knowledge base — everything is interconnected, and you can AI chat with anything inside.
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Hey Product Hunt!
I’m Dom — a founder of Second Brain 🧠
Problem 😫 AI chats are powerful, yet everything they produce disappears into a single thread. There’s no way to organize, reuse, or build on top of that knowledge.
🤔 What if an AI chat could live inside a visual, interconnected knowledge system?
✨ Second Brain lets you:
Save AI responses to Pages — clean, editable, shareable docs (think: Notion meets ChatGPT).
Create an AI Visual Board — multiple chats and content nodes in front of you (think: they met Miro too).
Add anything — YouTubes, IG Reels, TikToks, PDFs, GitHub repos, websites, Looms, etc — and chat with them.
Organize everything with Projects and Smart Tags — then chat with a whole project or tag group.
Use the Chrome Extension to save anything from the web in 1 click.
Humanize AI-generated content to bypass detection tools.
Powered by top models: Grok 3 Fast, Claude Sonnet 4, DeepSeek R1, GPT-4.1 — always kept up to date.
🔐 Privacy matters
Data is never used for training, never sold, and never stored on AI providers.
🔮 Coming soon
Add even more stuff to the chat context: YT Shorts, Google Docs/Sheets/Slides, LinkedIn posts, etc.
Ask anything with Global AI Search: “Find all Pages or YouTube videos where ‘marketing’ is mentioned.”
Summarize & Listen: drop content, Second Brain summarizes it into an audio and plays it to you.
Feel free to check it out, watch the demo, and share any feedback, feature ideas, or questions 🙏
Thanks for reading 💛
Dom
Love how Second Brain brings structure to AI conversations, something that's been missing in most tools. Does it support syncing across devices or team collaboration for shared knowledge building?
@shahriardgm currently there's only a web app, but it's responsive and works very well on mobile. Especially if you add the page to the home screen—then it feels more like a native app.
There's no team collaboration at the moment, but I had a few requests for it, so I'm already brainstorming how to do it!
I have to admit, that as a power user who has tried similar tools extensively over the past years, I've become vary on trying new stuff. It doesn't matter which second brain AI app I tried, I always run into the limitations quickly.
I guess the issue is the underlying AI models, that by themselves already promise things they can't fulfill.
I'm currently producing an online course out of my own book (380 pages) and other resources from other books.
Unfortunately the real context window of all the AI tools is about 60k Token. They become unresponsive after 100k - faaaar below the claimed 1M token (from OpenAI). My book alone needs 70k - so every other source I add breaks the system. So my question is: How much context can your tool handle IN REALITY?
If you'd ask me, I wouldn't consider myself a "power user" just for uploading 1-2 books, but that seems to be the reality.
Maybe most users are happy to chat with a few short PDFs and I'm one of the few who needs a (what they call) "massive" context window of several books. Oh boy...
@atmos_ awesome question!
And I agree, those 1M context windows work just in theory. You need to do some extra processing; that's what Second Brain does.
In the example of your book -> course use case, I would work like this:
You upload your book.
Then, you ask a question: "Make me a course about XYZ".
Second Brain first analyzes your book and grabs everything relevant about XYZ.
Then, it passes your prompt + relevant context about XYZ to the AI model, to get the answer.
In this way, only relevant parts from the book are passed, which increases the speed, quality, and cost. All the subsequent questions you ask will always get data from the book.
For a 380-page book, I would say it should work. Even before when it was not optimized that well, I was testing with a big book in German (400 pages), asking questions in English, and it worked well.
But I also don't wanna make false promises, because you know how it is with AI; the usage is so subjective, that the only real way of seeing if it works for you is actually trying it out.
@tech_wizzdom Sounds reasonable - thanks! But would it also work this way if I bring another book into the mix and say "Find the similarities and differences between the concepts of these books" and then make a lesson (or whatever) out of that? Practically I can't work with too tiny/focused sub-topics - it always needs to have my bigger picture. So the question is, if your second brain can process only the relevant parts of one bigger book - can it do so with a second book too and then connect the dots between these 2?
Knowledge Bases tend to grow quickly and become really big (at least in my case) - so this question is relevant for many other use-cases. I had to quit Kortex after just a few days, because after I uploaded just my Readwise/Kindle Highlights, the whole app became unusable.
Literally been drowning in scattered AI chats recently - Tryna find the one that works best for me tbh & the ability to save responses as proper pages + organize them visually is exactly what I've needed - Never thought I'd see the day I could chat w/ a Youtube vid lol!!
Can't wait to see how Dom and the team evolve this concept further!
@cranqnow thanks a lot Sam!! That's one of the core problems I had too—so much wisdom is inside those chats, yet everything gets lost.
And it just gets better the more you have inside!
@tech_wizzdom I know - Can't wait to try
Second Brain is such a perfect name for this—it actually feels like an extension of your mind! 🧠✨ Love how it bridges the gap between AI chats and visual organization (Notion + Miro + ChatGPT = genius). The fact that you can chat with anything—PDFs, videos, even GitHub repos—is mind-blowing. 🤯 And that provacy promise? Cherry on top. This is the next level productivity! Killer work, Dom! 🚀
@rani_zagita thanks a lot Zagita!! 🚀
I love this comment, you perfectly explained everything 😄
Really cool idea. I've always loved the node based systems and their visual representation.
This is definitely an interesting problem you're solving because the AI chats are scattered all over the place.
@ignat_petrov thanks a lot!! And it's so much better over time, when you actually fill it with data.
E.g. inside Second Brain, I have a project "Second Brain"; it's aware of everything I'm working on. And I can just chat with the entire project, and ask anything about it.
Wow all the best @tech_wizzdom !!
@themisty thanks a lot Krishna!! :)