Your second brain,
powered by AI
NestBrain ingests your documents, articles, and notes — then uses AI to build a living, interconnected knowledge base you can search, query, and think with.
$29 binary or build it yourself — same app · Mac + Windows · open source
Your knowledge is scattered
Notion pages, browser bookmarks, downloaded PDFs, Slack threads. You've read it. You can't find it when it matters.
AI assistants forget everything
ChatGPT starts from zero every session. No memory, no context, no connection between ideas. It knows nothing about your work.
Re-reading is wasted time
The insight you need is in a tab you closed six months ago. NestBrain remembers everything — so you don't have to.
How it works
Three steps. Zero configuration. All yours.
Ingest
Drop in URLs, PDFs, Markdown files, GitHub repos, or plain text. NestBrain pulls everything in.
Compile
The AI reads every source and builds a structured, interlinked wiki. Concepts connect. Gaps surface automatically.
Ask & Explore
Ask questions, get cited answers. Browse the knowledge graph. Your second brain — always ready, always growing.
See NestBrain in action
A knowledge base that looks and feels like a tool you actually want to use.
Interconnected wiki
Every source becomes a Markdown article with frontmatter, backlinks, tags, and navigable [[wikilinks]]. Concepts connect automatically as the LLM compiles new sources.
Mind Map
An interactive radial graph of your concepts and how they link. Spot clusters, dead ends, and unexpected connections. Click any node to open its article.
Ask anything, get cited answers
Natural-language Q&A grounded in your wiki. Answers include only the citations the LLM actually used, linking straight back to the source articles. Every answer is auto-saved to the knowledge base.
Wiki Health Check
An LLM-powered audit of your knowledge base: orphan articles, broken links, stubs, content gaps, and inconsistencies. Every finding is actionable — one click and you're on the exact article.
Built for people who think deeply
Whatever your role, NestBrain adapts to you.
Developers
Build a technical knowledge base from docs, RFCs, codebases, and research papers. Ask questions about your own stack — and get answers backed by your own sources.
Founders
Turn market research, competitor analysis, investor decks, and meeting notes into structured intelligence. Stop re-reading the same reports.
Power Users & AI-curious
If you've used ChatGPT and wondered "what if it actually remembered everything I've ever read?" — this is exactly that. For people who take their thinking seriously.
Two ways to get NestBrain
Free if you build it yourself. $29 if you want it pre-built and signed.
- ✓Full source code on GitHub
- ✓Build for Mac, Windows, or Linux
- ✓MIT-style license — yours to fork
- ✓Local-first — your data stays yours
- ✓Full Claude AI integration
Requires Node 20 + pnpm · ~2 minute build
- ✓Signed & notarized Mac app (Apple Silicon)
- ✓Windows x64 installer
- ✓Zero setup — just download & open
- ✓Priority support
- ✓All future updates included
Pay with card, Apple Pay, or Google Pay
Either way, it's the same app. Buying supports development and saves you 5 minutes.