Your second brain,
now with AI.

description Textchecklist Todogrid_on Tabledraw Canvasmic Audio
view_kanban Kanbanview_timeline Ganttschema Mind Map

Ask AI to help write notes and find answers across everything you wrote.

Cloud hosted or 100% Local
Your privacy, your choice.

Open NoteBrain AI Free Download Desktop

Free forever · No account needed · macOS, Windows, Linux, Web

The NoteBrain desktop app: notes sidebar with knowledge graph, a rich-text note open, and the AI assistant answering a question from your notes with cited sources.

The actual app: notes, many advanced editors, knowledge graph and AI in one window.

AI that knows your notes

Powered by RAG to find the right context.
Ask a question, get an answer from your notes.

✦ AI Assistant NoteBrain AI
tune edit_square
What did we decide about the Q4 launch date, and what’s the marketing budget? 14:32
✦

You agreed to ship the beta on March 15 and v1.0 on April 22, with a €20k marketing budget for the launch campaign and press tour.

Sources
description Q4 Roadmap view_kanban Sprint Plan grid_on Marketing Budget
14:32
Ask about your notes… mic
send
key
Own API keys Gemini, OpenAI, Claude: free, all platforms
memory
Ollama 100% local & private: free, desktop
cloud
NoteBrain AI Managed, no setup: from $3/mo

Notes powered by AI

Select any text in your notes, then ask AI to fix grammar, rewrite, translate, turn into a list, or generate something new from a prompt. Right inside the editor, with one click.

auto_fix_high Write with AI
🤖 Ask AI
spellcheck
|
auto_awesome Text replaced check Accept undo Undo
Select · pick an AI action · replace in place
Model Context Protocol

Your notes, inside your AI agents

Connect your AI agent to NoteBrain AI over MCP — it reads, searches and writes your notes directly. Ask in your terminal, watch the note appear in your second brain.

MCP + NoteBrain AI Plug your AI agent into your second brain — read, search & write notes ① You ask — in plain words > Make a 101 course on photosynthesis, with an SVG diagram …a note · a course · a slide ② Agent connects 🤖 AI Agent Claude Code · Codex · Gemini CLI asks MCP · HTTP 🔒 call → result 🔌 NoteBrain.ai · MCP Server (*) speaks the Model Context Protocol ③ Tools the agent can call 🔎 search_notes 📖 read_note ✍️ create_note 🗂 organize 📋 create_kanban 💬 ask_notes read · search · write — across all 7 editor types (*) 💻 Free on Desktop MCP server (token-secured) OR ☁️ Cloud NoteBrain AI MCP server writes ④ Your second brain 📂 Photosynthesis 101 📄 Introduction 🧩 How It Works 📄 Light & Dark Reactions 📄 Key Terms created live by your agent ✅ Notes appear instantly Ask in your terminal — watch it appear in your brain Built with NoteBrain.ai
How MCP links your AI agent to NoteBrain — authenticate, call tools, your notes update live.
This slide was itself generated by an AI agent over MCP — see more →
terminal Claude Code

> Make me a short intro course on photosynthesis — a folder of notes, and draw the process as an SVG diagram in one of the notes

bolt notebrain-ai · organize “Photosynthesis 101”

bolt notebrain-ai · create_note ×4

check_circle Created folder “Photosynthesis 101” — 4 notes incl. SVG diagram

NoteBrain AI bolt Created via MCP
  • folder_open Photosynthesis 101
  • description Introduction
  • account_tree How It Works diagram
  • description Light & Dark Reactions
  • description Key Terms

How It Works

Plants turn sunlight, water and carbon dioxide into glucose — their food — releasing oxygen as a byproduct. Chlorophyll in the leaves captures the light that powers the whole reaction.

light CO₂ O₂ H₂O
6 CO₂ + 6 H₂O  →  C₆H₁₂O₆ + 6 O₂

See more pics made with NoteBrain AI arrow_forward

MCP servers
  • ☁️ Cloud — NoteBrain AI MCP server, hosted for you on Cloud plans. Connect over HTTPS, nothing to install.
  • 💻 Desktop (free) — a local MCP server that runs on your machine, token-secured; your notes never leave it.
MCP clients · non-exhaustive
terminal Claude Code forum Claude Desktop code OpenAI Codex auto_awesome Gemini CLI + any MCP client

Many editors. One app.

Don’t glue together five tools. Text, todo, kanban, table, gantt, mind map, canvas - all in NoteBrain, all linked together. Plus voice memos with live transcription.

Welcome to NoteBrain AI

Project Orbit - Launch plan

A complete plan to launch the next version of Orbit. See also Kanban Board for the live board.

Goals

  • Ship beta on March 15
  • Reach 500 signups in week one
  • Grow mailing list to 5k subscribers
# Project Orbit - Launch plan

A complete plan to launch the next version of **Orbit**. See also [[Kanban Board]] for the live board.

## Goals
- Ship beta on *March 15*
- Reach 500 signups in week one
- Grow mailing list to 5k subscribers
Today
1/4
Morning run - 5K
Review PRsApr 18
Call the bank about the mortgage
Groceries for dinner
This week
0/2
Book dentist appointmentApr 22
Plan Saturday hike
Backlog2
New landing page hero
Launch announcement blog post
In progress2
Checkout flow redesign
Fix signup validation
Done3
Cookie banner update
Hero image refresh
Fix 404 page layout
ItemCategoryCostNote
RentHousing€1,200Direct debit
GroceriesFood€420Estimated
Transit passTravel€90Monthly
GymHealth€45
Total€1,755
2026
MarchAprilMay
Launch Plan
Research
Design
Build
Launch
Product Launch
Marketing Blog Email Social
Design Hero Pricing Email
Engineering Sprint QA Release
Sales Demo Outreach

Share, Sync & Collab

Cloud plans keep your notes in sync across every device and let you share any note or folder. Watch Alice and Bob edit the same Getting Started note - live user flags show who’s editing where.

Alice’s MacBook

Welcome to NoteBrain AI

Your second brain: notes, drawings, tables.  Now with AI chat & search, all linked.

See what’s here

  • 📋 Kanban Board: project tracking
  • ✅ Todo List: daily tasks
  • 📊 Gantt Chart: project planning
  • 🎨 Canvas: free drawing & diagrams

Everything is local-first - encrypted in transit and at rest. Bob

Bob’s iPhone

Welcome to NoteBrain AI

Your second brain: notes, drawings, tables.  Now with AI chat & search, all linked. Alice

See what’s here

  • 📋 Kanban Board: project tracking
  • ✅ Todo List: daily tasks
  • 📊 Gantt Chart: project planning
  • 🎨 Canvas: free drawing & diagrams

Everything is local-first - encrypted in transit and at rest.

Zero-knowledge

End-to-End Encrypted so only you can read them

Turn on end-to-end encryption on any Cloud plan. Your notes are encrypted on your device with keys derived from a passphrase only you know - we never see it, and we cannot read your notes.

enhanced_encryption

Encrypted on your device

Titles, content, and attachments are encrypted locally before they ever leave your machine. The server only ever stores ciphertext.

key

You hold the only key

Keys are derived from your passphrase, with a recovery key as backup. NoteBrain never receives either - lose both and not even we can restore your data.

vpn_lock

A deliberate trade-off

Because our servers can't read encrypted notes, sharing and real-time collaboration are disabled while E2E is on. Toggle it off anytime to re-enable them.

Prefer fully private AI too? Use Ollama or your own API keys - your notes never touch our servers. Read how encryption works →

Pick what fits you

Same app, two setups. Both free to start.

☁

Cloud

Everything free — plus sync, collaboration & managed AI

  • All advanced editors, graph view & attachments
  • Bring your own AI keys (GPT, Gemini, Claude) or free Ollama
  • Import / export (Markdown, Obsidian, ZIP)
  • Cloud plans add
  • Cross-device sync, cloud storage & backups
  • Real-time collaboration & sharing
  • NoteBrain AI — managed, no API key needed
  • Hosted MCP NoteBrain AI server
Open Free
💻

Desktop

Full power, total privacy

  • Notes as files on your disk
  • Ollama: free, local, private AI
  • NoteBrain AI or your own keys (GPT, Gemini, Claude)
  • Local MCP NoteBrain AI server (token-secured)
Download Free macOS · Windows · Linux

See it in the real app

Real screenshots: the knowledge graph, AI answers with cited sources, and spreadsheets.

auto_awesome Ask AI
The AI assistant answering a question with an answer drawn from the user's own notes, listing the source notes it used.
Answers drawn from your notes - with the sources it used.
grid_on Spreadsheet
A spreadsheet note open in the table editor with rows, columns and totals.
Full spreadsheets, alongside every other note type.
brush Canvas
An infinite whiteboard canvas with hand-drawn shapes, arrows and diagrams.
Canvas: sketch ideas on an infinite whiteboard.
timeline Gantt
A Gantt chart timeline showing project tasks, durations and dependencies.
Gantt: plan projects on a timeline.
view_kanban Kanban
A Kanban board with cards organised into columns by status.
Kanban: move work across boards.
account_tree Mindmap
A mindmap branching out from a central topic into related ideas.
Mindmap: branch ideas out visually.
checklist To-do
A to-do checklist with completed and pending tasks.
To-do: track tasks and checklists.
hub Graph view
The knowledge graph showing notes connected as nodes.
Your notes and links, visualized as a graph.

How NoteBrain compares

vs. Notion

Notion is fast and pretty, but lives in the cloud. NoteBrain keeps your notes on your machine, runs AI locally, and is free forever.

Notion alternative →

vs. Obsidian

Obsidian’s vault is great, but Sync is a paid addon and there’s no live co-editing. NoteBrain bundles AI, many advanced editors, sync, sharing, and live user flags, no addons.

Obsidian alternative →

vs. Trilium

Trilium needs Docker for multi-device sync and is single-user only. NoteBrain syncs across devices, shares notes with anyone, and shows live user flags, no server to host.

Trilium alternative →

For share, sync & collab

Sync across devices, share any note or folder, and see who’s editing where with live user flags. Built-in on Cloud plans, no addon, no Docker.

See it in action →

For privacy & GDPR

On desktop, notes are plain files on your disk; on web, they stay in your browser’s IndexedDB. No telemetry, no lock-in, GDPR-friendly. Optional cloud sync is opt-in.

Local-first notes →

For local AI + RAG

Hook NoteBrain to a local Ollama model. Hybrid (FTS + vector) RAG answers questions from your own notes - offline, free.

Ollama + RAG →

Simple pricing

The app is free. Pay only for managed cloud services.

Free $0 forever

All advanced editors, graph view, search, import/export, 100K cloud AI tokens, unlimited Ollama & own API keys.

Use It Free Ready in 2 seconds. No account needed.
AI Plans - Desktop app + Web app + NoteBrain AI

Starter

$3

per month

  • Desktop app & Web app
  • 1M NoteBrain AI tokens/month
  • All advanced editors
Popular

Pro

$8

per month

  • Desktop app & Web app
  • 5M NoteBrain AI tokens/month
  • Pro model

Business

$15

per month

  • Desktop app & Web app
  • 10M NoteBrain AI tokens/month
  • Pro model
Cloud Plans - All in AI + cross-device sync + cloud storage

Starter

$4

per month

  • Everything in AI Starter
  • Cross-device sync
  • 2 GB cloud storage
  • Hosted MCP NoteBrain AI server
  • Optional end-to-end encryption
Popular

Pro

$10

per month

  • Everything in AI Pro
  • Cross-device sync
  • 10 GB cloud storage
  • Hosted MCP NoteBrain AI server
  • Optional end-to-end encryption

Business

$20

per month

  • Everything in AI Business
  • Cross-device sync
  • 25 GB cloud storage
  • Hosted MCP NoteBrain AI server
  • Optional end-to-end encryption

Ollama and your own API keys (Gemini, OpenAI, Claude) are always free on all plans.

End-to-end encryption is optional and zero-knowledge: only you hold the keys. Enabling it disables note sharing and real-time collaboration.

Ready in 2 seconds

No account. No credit card. Just open and write.

Open Free Download Desktop