Cygtree
Simply a note board that respects you and your wallet.
Windows 10 & 11 · 64-bit · signed by Cygnus Crane L.L.C.
It is a board, and your ideas are cards on it
No outline, no rows, no tree view pretending to be a canvas. You put a card down, you drag another next to it, and the line between them is the thought.
Cards you can actually push around
Arrange, connect, nest and collapse. Colour a branch so you can find it again. Fold a finished section away without deleting it.
Images, PDFs and audio live on the board
Not attachments in a sidebar — the page you are quoting sits next to the card that argues with it, at the size you dropped it.
- Every edit is undoable, and the history is a panel you can read, not a mystery.
- Search and a command palette, so a board with hundreds of cards stays navigable.
- Dictation and read-aloud built in, running on your machine.
- Export the board as an image or a copy, whenever you want, with no account.
Bring your own AI
Cygtree does not sell you tokens and does not hold an API key. It drives the AI tools you have already installed and already paid for — and they edit the board itself, not a chat window sitting beside it.
The CLI you already use
Claude Code, Codex and Cursor run as themselves, signed into your own account, at your own plan's rates.
Any ACP agent
Cygtree speaks the Agent Client Protocol, so an agent nobody has written yet can drive a board the day it ships.
Model of the week, welcome
The model list is read off your machine, not shipped in the app. A model released this morning is selectable this morning.
Cygtree charges you nothing for AI and takes no cut of it. If you have no AI tool installed, the board still works — it is a mind map first.
Buy it once
It is a small tool that runs on your computer and writes files to your disk. That should not be a monthly bill, so it isn't one.
- No card required
- Every feature, not a crippled demo
- Licence key arrives by email
- No subscription, no seats, no renewal
- No cloud account to sign into
- Your boards are files on your disk
Download
One installer. It is the same app either way — the trial is a licence, not a different build, so buying does not mean downloading again.