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.
One brain. Every device.
Sign in with Google and NestBrain keeps your workspace in lockstep across every machine you use — laptop, desktop, work, anywhere. Edits land within ~60 seconds. Sync is optional, per-device, and your data lives in your own Google Drive.
Your Drive, your files
NestBrain creates a dedicated NestBrain-Sync folder inside your own Google Drive. The drive.file OAuth scope means the app can only see what NestBrain itself put there — never the rest of your Drive. No NestBrain server in the middle, ever.
Union-only, never destructive
A delete on one device never destroys data on the others — local deletes go to a synced .trash/ folder recoverable from any machine. Only an explicit "Delete on all devices…" with a typed confirmation removes a file everywhere.
Conflict? Keep both.
Edit the same note on two devices while offline? Both versions survive. Your local file stays put; the other arrives next to it as foo.conflict-<timestamp>.md. You decide what to merge — NestBrain never silently overwrites your edits.
Optional, per-device
Sync is off by default. Turn it on per machine; choose whether your Projects/ code folder travels with the rest. node_modules, .git, build artifacts, and API keys are always excluded. Your preferences live on each device — switch them any time from Settings.
Background watcher · Drive REST API · MD5 diffs · atomic writes · no subscription · no NestBrain account · your data is yours.
One brain. Your entire organization.
Personal sync keeps you in step across your devices. Team Knowledge Sharing keeps your whole team in step — a single, compiled body of institutional knowledge, synchronized in real time on infrastructure you own and control.
Compile once. Shared with everyone.
Each member compiles knowledge locally — the expensive AI work happens a single time, then a teammate's articles appear in your wiki, search and Mind Map. No re-compiling, no paying the LLM bill twice for the same source.
Your server. Your data. Full sovereignty.
Self-hosted on your own VPS or private server — never a NestBrain machine in the middle. Content is encrypted in transit and at rest. Your intellectual property stays inside your perimeter, under your governance.
Real-time, conflict-safe synchronization
A background engine propagates changes the moment they land. Edit the same article on two machines and both versions are preserved — never a silent overwrite. Incoming knowledge is re-indexed locally so search and Ask find it instantly.
Centralized seats, members & licensing
Provision members, allocate seats and monitor activity from an in-app admin console. Access is enforced by a signed, seat-based license validated centrally — with offline grace, so your server never holds your team's knowledge hostage.
Self-hosted · seat-based · GPL desktop app + private Team Server. We'll scope a deployment that fits your team.
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
A neural graph of your knowledge. Dense topics collapse into glowing macro atoms that explode on hover — fanning out their concepts with readable labels, then re-collapsing when you move away. Pinch-zoom, pan, and 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.
Three ways to get NestBrain
Build it free, buy the signed app for $29, or bring it to your whole team.
- ✓Full source code on GitHub
- ✓Build for Mac, Windows, or Linux
- ✓GPL-3.0 license — yours to fork
- ✓Local-first — your data stays yours
- ✓Claude, OpenAI & local Ollama models
- ✓Edit any wiki page by hand or with AI
- ✓Multi-device sync via your own Google Drive
Requires Node 20 + pnpm · ~2 minute build
- ✓Signed & notarized Mac app (Apple Silicon)
- ✓Windows x64 installer
- ✓Zero setup — just download & open
- ✓Multi-device sync wired in — no OAuth setup
- ✓Priority support
- ✓All future updates included
Pay with card, Apple Pay, or Google Pay
- ✓Everything in the $29 app
- ✓Team Knowledge Sharing across your org
- ✓Self-hosted on your own server
- ✓Real-time, conflict-safe sync
- ✓Centralized seats, members & admin console
- ✓Seat-based licensing with offline grace
- ✓Priority onboarding & SLA
We'll scope a deployment for your team
Free and $29 are the exact same app — $29 just buys the signed binary and supports development. Enterprise adds Team Knowledge Sharing for organizations.
Bring NestBrain to your team
Tell us about your organization and we'll get back to you within one business day to scope a self-hosted Team Knowledge Sharing deployment — seats, server, and onboarding included.