Let ideas
connect naturally

Lumen is a knowledge graph for connected thinking. Link each idea to multiple topics and keep notes, documents, audio, and web references together. Work offline on your computer, sync across devices, and let Dot help you find and organize what you know.

Create account Open web workspace

Already signed in on this browser? Open the workspace to return to your knowledge bases.

“Local first” belongs to two topics at once. No duplicates, no need to choose just one.

Beyond a tree

A traditional mind map gives each idea one place. Real knowledge often belongs to several topics. Lumen connects it with three kinds of relationships.

Child ideas

Break a topic into smaller ideas and explore it step by step.

Multiple parents

Place one idea under multiple topics. Edit it once and every view stays up to date.

Connect ideas across topics with labels such as “reference”, “depends on”, or “next step”.

Keep sources beside your ideas

Markdown notes: Write task lists and [[idea links]]. Backlinks show which ideas refer to the current one.
Documents & excerpts: Read and search PDF, Word, Excel, PowerPoint, and text files. Excerpts keep a link to their source.
Audio: Keep recordings and audio with an idea, ready to play. Generate spoken examples from English content for review.
Web references: Keep articles and reference links beside an idea. Browse them by website or favorites in the resource library.
Tasks: See note tasks together in the task center. Check one off and its original note updates too.

One knowledge base, different perspectives

Graph view

See your ideas and their connections, with smooth navigation through larger graphs.

Focus view

Focus on an idea, its parents, children, and related ideas. Follow connections at your own pace.

Outline

Read and reorder ideas in a hierarchical list, with keyboard support.

Local first. Sync when you need to.

The desktop app stores knowledge bases on your computer, so you can keep working offline. Sign in to sync when you want to continue on another device.

Sync across devicesOffline edits are queued and synchronized when you reconnect.
Resolve conflicts with confidenceIf two devices change the same content, choose which version to keep for each conflict.
Organize togetherInvite collaborators to edit or view. Transfer ownership when you need to.
Recovery codeShown once at sign-up. Use it to reset a forgotten password. Passwords and recovery codes never pass through Dot.

Find and organize with Dot

Connect Dot to your Lumen account through MCP. Dot can access only authorized knowledge bases, within your existing permissions.

Create a Lumen account
Choose a username and password, and save the recovery code shown only once.
Add an MCP server in ChatGPT plugins
Add a custom MCP server, choose OAuth authentication, and enter this address:
https://xiadaogu.com/mcp
Open ChatGPT plugins (new window)
Sign in to Lumen and authorize
Once connected, ask Dot to find ideas, organize notes, or prepare reviews.

Start with an idea

Create a knowledge base in the web workspace, or enter this service address in Account & Sync in the desktop app.