Privacy

Updated 11 October 2026

Deltella is a notebook first. What you write stays on your computer unless you share a board. This page says what is kept where, and who can read it.

On your computer

Notebooks, whiteboards, pictures, PDFs, recordings, and settings are kept by the app on your computer. They are not sent anywhere. There is no Deltella account, and the app does not collect analytics.

The Windows app checks GitHub for a newer version when it starts and every six hours. That request carries nothing you wrote.

When you share a board

Sharing a whiteboard puts a copy of that one board on Deltella’s server at boards.deltella.com, so others can open it while your computer is off. The server keeps:

• the board itself: its ink, text, shapes, and the pictures and PDFs on it;
• a one-way hash of each of the board’s three keys (yours, the edit link’s, and the view link’s), never the keys themselves.

While people are on a board, their name, colour, and pointer are passed to the others on it. They are not stored.

The key is the part of a link after the #. Browsers do not send that part to servers, so links do not end up in logs. A picture or PDF can only be read with a key to a board it was added to.

Who can read a shared board

• Anyone with the edit link can read and change it. Anyone with the view link can read it.
• New links stop the old ones working straight away.
• Stop sharing deletes the board and its keys from the server. Everyone keeps the copy they already have on their own computer.

Boards on the server are copied to an encrypted backup each night, so a lost server can be rebuilt. Backups are kept for up to six months and then deleted.

What the server logs

Like any web server, it sees the address each request comes from. It uses that to stop one address making too many boards, and does not keep it with the board.

Questions

Open an issue at github.com/Deltella/deltella-public.