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The knowledge base that watches your videos

One Brain For
Everything You Save.

Drop videos, PDFs, podcasts, articles, notes — anywhere, any format. It's auto-organized, semantically searchable, and you can chat with any of it — or all of it.

Notion can't read your TikToks. Obsidian can't watch YouTube. Second Brain does both.

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Context
MIT Lecture — Attention & Transformers
Attention Is All You Need.pdf
Weekly_Learning_Notes.md
Ask anything across your knowledge...

Everything you can do.

One brain. Every source. Ask it anything.

save anything instantly. drop in any PDF. capture from anywhere. archive every article. one click to save. build your library. never lose a tab again. remember everything.
summarize any paper. break down a 300-page book. chat with any textbook. understand dense papers. skim a 400-page report in minutes. learn from 50 sources at once. research without the rabbit hole. study smarter not longer. compare two papers side by side.
find what you forgot. search by meaning not keywords. recall that quote you saved. find the PDF from 6 months ago. find anything in seconds. semantic search that actually works. pull the quote from chapter 7. find the highlighted passage. instant recall.
connect the dots across sources. see the pattern in your notes. merge insights from anywhere. write with every note loaded. draft a memo from your reading. brief yourself on any topic. build a report from your library. generate insights not summaries. explain it back in plain words.
summarize any meeting. chat with your Zoom calls. pull action items from a transcript. PARA method done right. organize every project. plan your week with full context. think on an infinite canvas. stop context-switching. one brain for everything.
Sound familiar?

Your knowledge is
working against you.

You consume incredible content every day. But without a system, it all disappears — and you start from zero, every single time.

Scattered everywhere

Bookmarks you never revisit. Notes buried in 5 different apps. Videos you saved but can't find.

Hours wasted searching

You know you saved it somewhere. Was it Notion? Google Docs? That one Slack thread? You spend more time looking than learning.

AI can't read your content

ChatGPT can't watch your saved TikToks. Gemini can't read your PDFs. No AI tool connects all your knowledge.

See it in action

Three Ways to
Explore Your Knowledge

Auto-plays on scroll. Switch tabs to explore each feature.

See your knowledge laid out spatially on an infinite canvas

0s / 25s
Full PARA method implementation

You Know PARA.
We Actually Built It.

Every other tool makes you fake PARA with folders and tags. Second Brain is the only app where Projects, Areas, Resources, and Archives are real, first-class features — with AI doing the heavy lifting.

Projects

Goals, deadlines, lifecycle tracking

Areas

Automated review cadences

Resources

Cross-linked reference material

Archives

One-click restore, nothing lost

12 Favorite Problems with AI-powered knowledge search
Automated area review cadence — weekly, monthly, quarterly
Brain Chat — talk to your entire knowledge base in one prompt
Chat with any project — AI scoped to everything inside
See the full PARA implementation

Drop Anything. It's Auto-Organized.

Videos, PDFs, articles, podcasts — drop them and they're instantly in your second brain, auto-tagged and searchable.
  1. Paste a YouTube link — it's transcribed, summarized, and saved.
  2. Drop a PDF — AI extracts the key points and tags it by topic.
  3. Everything is auto-organized so you never have to manually file anything.
Stop organizing. Start knowing. Your knowledge base builds itself.
Start Your Second Brain
Knowledge Graph

Search by Meaning, Not Keywords

Semantic search finds content by what it means, not just the words it contains. Finally find that thing you saved.
  1. Search: "That video about morning routines" — found, even if you never typed those words.
  2. Search: "What I learned about focus" — shows all relevant saves across formats.
  3. Find anything from your entire library in seconds.
Search like you think. Semantic search understands what you're looking for.
Start Your Second Brain
🔍

That video about habit building

Searching by meaning...
🎬

James Clear on Atomic Habits

YouTube • 98% match

✓
📄

Building Better Routines.pdf

PDF • 87% match

📱

Morning routine TikTok

TikTok • 82% match

Found by meaning, not keywords

Chat with Your Entire Knowledge Base

Ask questions across everything you've saved. Get answers that synthesize insights from your whole library.
  1. Ask: "What have I learned about productivity?" — answer from all your saved content.
  2. Ask: "Connect the ideas from these three videos" — AI finds the patterns.
  3. Save AI responses as permanent notes to build on.
Your knowledge, finally usable. Chat with everything you've ever saved.
Start Your Second Brain
Marketing
Design
Development
Research
Project Ideas
12 items
Research Notes
8 items
Meeting Summary.md
Auto-organized
One subscription, all top models

Pick Your AI. Switch Anytime.

Stop paying for separate subscriptions. Get GPT-5.4, Claude, Gemini, Grok — plus AI image and video generation — all in one place.

GPT-5.4
Claude Opus 4.6
Grok 4.1 Fast
Gemini 3.1 Pro
Nano Banana Pro
Sora 2 Pro
Why this is different

You've Tried Other Tools.
They Didn't Work.

Notion requires endless manual organization. Obsidian needs you to be a power user. NotebookLM can't read half your content. None of them understand how you actually consume information today.

Notion

Great for docs
  • AI can't read videos or social media
  • Manual organization required
  • No visual/spatial interface

Obsidian

Powerful but complex
  • Steep learning curve
  • Manual linking between notes
  • No AI that understands content

NotebookLM

AI but limited
  • Can't read TikToks, Reels, or social
  • No visual boards
  • Limited source types

Second Brain

Built from scratch for how people actually save and use knowledge in 2026.

Reads TikToks, Reels, YouTube, podcasts, PDFs, articles—everything
Auto-organizes with zero manual work
Visual AI boards for spatial thinking
Semantic search finds anything by meaning
Chat with one item or your entire knowledge base
Auto-generated mind maps show connections

Your Knowledge Stays Yours

Your data is never used for AI training, never sold, and never stored on third-party AI providers.

Achieve Peak Productivity—
10x Faster

Effortlessly turn chaotic information into structured, actionable knowledge.

Second Brain isn't just a storage app; it's a revolutionary platform that handles every type of content and lets you chat with it for real-time solutions.

Leave 2010 methods behind—focus on what matters: mastering your time, energy, and goals with cutting-edge AI power.

Start Your Second Brain