Fluid WikiYour knowledge. On your device.
Keep Markdown files on your own disk. Back up, move, and keep your knowledge for the long term.
Let knowledge flow. Make space to think.
A local-first workspace for Markdown notes, AI, and visual thinking.
Capture ideas, connect your knowledge, and build on what you know.
Windows x64 Free download · 30-day trial · Local storage · Bring your own AI key
Your API key is stored locally and used only with your chosen AI provider.
Your notes, ideas, and tools. One workspace.Feature overview illustration · Click to enlarge ↗
Your local-first knowledge workspace
Your model. Your choice.
Connect your own AI provider and let your assistant work with your knowledge.
Small ideas. New connections.
Follow links, search your notes, and explore the graph to find new paths through your ideas.
Tools for notes, AI, and visual thinking
01 / STICKY NOTES
Catch ideas with sticky notes.
An idea, a reminder, a sentence you want to keep. Drop it onto your sticky notes wall, then come back when you are ready to take it further.
- Capture quick notes with Markdown and checklists
- Arrange, color, and pin cards your way
- Turn a useful sticky note into a document
02 / WRITE
Write and connect local Markdown notes.
A useful passage. A question worth exploring. An idea still taking shape. Start with a note and make room for a daily writing practice.
- Local Markdown files, under your control
- Rich editing that keeps you focused
- Links that connect one note to another
Actual client interface · English demo vault
03 / EXPLORE
Ask AI questions about your knowledge base.
Ask AI to search, read, and answer questions about your vault. Start with a question and put the knowledge you already have to work.
- Keyword search with optional semantic retrieval
- Answers grounded in notes, with source references
- Bring your own key and compatible AI provider
Sample conversation included in English demo vault
04 / CONNECT
Explore connections with a knowledge graph.
Your knowledge can reach beyond folders. Explore relationships between concepts and follow threads that run through different notes.
- Explore connected content through topics
- Move from the bigger picture to your notes
- Use what you know to discover what comes next
Actual client interface · English demo vault
05 / WHITEBOARD
Sketch ideas on a visual whiteboard.
Step outside the page. Use an open canvas to sketch a process, map a question, or turn a loose thought into a picture you can work with.
- Draw with shapes, arrows, text, and freehand strokes
- Bring diagrams and images onto the same canvas
- Keep your boards alongside your knowledge
Actual client interface · English demo vault
06 / MIND MAPS
Organize your thinking with mind maps.
Start with one idea, branch into the details, and see how they fit together. Use a mind map to organize what you learn and plan what comes next.
- Build a clear hierarchy with topics and branches
- Add node notes, icons, and connections
- Keep mind maps alongside your documents and boards
Actual client interface · English demo vault
07 / SPREADSHEETS
Keep spreadsheets alongside your notes.
Track a budget, build a reading list, or follow your daily habits. Give structured information a place alongside your notes and ideas.
- Organize information in rows, columns, and worksheets
- Use formulas to calculate and compare values
- Keep spreadsheets in your local knowledge vault
Actual client interface · English demo vault
08 / THEMES
Make your workspace yours with themes.
Move between light and dark, or choose a palette that feels like you. Make the place where you read, write, and think your own.
- Switch between light and dark themes
- Choose from a range of built-in palettes
- Make your workspace feel like your own
AI helps you write. You stay in control.
Review proposed document changes before confirming an AI edit.
Ask → Review → Confirm
30-day free trial and lifetime license
30days. Every desktop feature.
Start with a note. Explore the whole workspace.
- All desktop features included
- Markdown, sticky notes, whiteboards, mind maps & spreadsheets
- AI assistant & knowledge graph · bring your own key
Existing free users also receive a 30-day trial when upgrading to this licensed release. After the trial, you can still view and export your data. Adding and editing content will stop.
One payment. Yours to keep.
$39 USD · one-time
One license for the devices you think on.
- Use on 3 devices, with self-service unbinding
- Permanent desktop license & lifetime desktop updates
- Windows now, with Mac included when released
Future SaaS sync and other services are not included. AI provider usage is billed separately.
The standard desktop license is $39 USD. Request a full refund within 14 days of purchase. Buy securely through Dodo Payments. Windows download available; Mac is not available yet.
BEFORE YOU BEGIN
A few things to know
What happens after the free trial?
The trial lasts 30 days and includes all desktop features. After it ends, you can still view and export existing data; adding and editing content will stop. Bring your own AI key; model provider charges are separate.
What does the lifetime license include?
One license covers 3 devices, with self-service unbinding, a permanent desktop license, and lifetime desktop version updates. It covers Windows and Mac when released; Mac is not available yet. Future SaaS sync and other services are excluded. The standard license is $39 USD, paid once. Buy securely through Dodo Payments.
Where are my notes stored?
Your vault lives in a local folder you choose. Documents are Markdown files, with a local database for indexing. You can back up the vault yourself. When you use AI, relevant content is sent to your selected model provider.
What do I need to use AI?
Configure a compatible model provider and your own API key. Your API key is stored locally and sent only to your chosen AI provider to authenticate requests, not to the Fluid Wiki licensing service. Your provider charges for model usage, and online models require an internet connection. Semantic search also requires an embedding model.
Can I work offline?
You can read and edit local notes without an online model. Online AI, web search, and downloads require a connection. Local storage does not mean online AI requests stay on your device.
Which platforms are available?
Fluid Wiki is available for Windows x64 through Microsoft Store or a direct installer download. A macOS download is not available yet.
Is Fluid Wiki open source? Can I buy it here?
Fluid Wiki is proprietary software. All rights reserved. Download the client or purchase a lifetime desktop license here. The standard license is $39 USD; an activation code is delivered by email after payment verification. AI provider costs are separate from the client license.