SixthSense
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SixthSense for Windows and Mac

A folder that
files itself.

The desktop app puts SixthSense in Explorer and Finder, right next to OneDrive and iCloud Drive. Drop in anything and it lands in the right place. Notes you write in the browser, or that your AI saves, show up as files.

01 · Both ways

Your notes, as files

Everything in SixthSense is in the folder. Notes written in the web app, or saved by Claude, ChatGPT or Cursor, appear as Markdown files. The files you dropped in are there as themselves.

A file downloads the first time you open it, so the folder takes almost no space. Edit it in any app, and the change is uploaded: every assistant sees it straight away.

  • Move a file to another folder, and it stays there
  • Rename a folder, and its topic is renamed too
  • Delete a file, and the note is gone everywhere

02 · Skills

Skills, in a folder of their own

The Skills folder holds your agent skills, one folder each with its SKILL.md and scripts, laid out just as assistants expect them. Edit them in your favourite editor.

Drop in a skill folder to add it. It stays a draft until its SKILL.md is valid, then it becomes a skill that every assistant you connect can install.

03 · Connect

With your account, or only on this computer

Sign in to your SixthSense account, and the folder holds the same knowledge as the web app and your AI tools. The browser asks you to confirm, and the app gets its own key, which you can take back under Account at any time.

Or keep it all on this computer: the app runs SixthSense for you, in a single knowledge file you can copy and back up. It works with your own SixthSense server too.

Up and running in a minute

On Windows:

  1. 1 Download and unzip

    Put the folder anywhere, for example in Documents. Keep sixthsense-desktop.exe and sixthsense.exe together.

  2. 2 Start it

    Open sixthsense-desktop.exe. The app isn’t code-signed yet, so SmartScreen asks first: choose More info, then Run anyway.

  3. 3 Choose what to sync

    It starts with a knowledge file on this computer. To use your account instead, right-click the SixthSense icon in the taskbar, open Settings and sign in.

  4. 4 Open Explorer

    SixthSense is in the navigation pane. Drop something in and watch where it goes.

On a Mac, the app works the same way, from the menu bar and the Finder sidebar. It isn’t in the downloads yet; until it is, the command-line app runs SixthSense on your Mac.

All downloads

Command line

Prefer a terminal?

sixthsense is all of SixthSense in one file. It runs the web app on your own computer, with your knowledge in a single file, and hands that file to Claude Code, Claude Desktop, Cursor or any other app that speaks MCP.

sixthsense serve knowledge.db
The web app at 127.0.0.1:7070, with MCP at /mcp
sixthsense mcp knowledge.db
MCP over stdio, for assistants that start it themselves
sixthsense host
The server for a team: sign-in by email, a knowledge file for each person

Questions

Windows warns me about the app. Is it safe?

The app isn’t code-signed yet, so SmartScreen doesn’t know it. Every build is made by the project’s automated release, straight from the source code. To check that your download is the one listed here, compare its SHA-256 (under All downloads) with Get-FileHash in PowerShell or shasum -a 256 on a Mac.

Where are my files kept?

Inside your knowledge file: in your account, or on your computer if you chose a local file. The folder shows what’s in it, and files download the first time you open them. That’s why the folder can be set up again on any computer, and why the web app can always give you back the original of anything you dropped in.

What can I drop in?

Anything up to 100 MB. PDFs, Word, Excel, PowerPoint, OpenDocument, EPUB, web pages and plain text are converted so they can be searched; photos and scans are read by the vision model. Files that can’t be converted, such as archives or audio, are kept and filed by their name.

Can I still organize things myself?

Yes. Move a file into a folder, and it stays there. Make your own folders, and new files can be filed into them. Rename a topic’s folder, and the topic keeps that name from then on.

How do I pause or remove it?

The SixthSense icon in the taskbar (or the menu bar) has Pause syncing and Quit. To take the folder out of Explorer, run sixthsense-desktop --unregister; the files in it become regular files. Then delete the app’s folder. Your knowledge stays in your account or knowledge file.

Does it work with my own server?

Yes. In Settings, enter your server’s address instead of 6thsen.se and sign in. A sixthsense serve running on your computer works too.

Drop in a folder. Watch it sort itself.

Start with the documents you already have. Every file you add makes your AI a little better informed.