Zero-knowledge encryption notes

Your thoughts — and the data they become — are yours alone.

Lyunotes is a note-taking app for Mac, Windows, and iPhone, with optional zero-knowledge encryption you control notebook by notebook. Notes that live on your machine, in your cloud, under your key. No account. No server holding a copy. No door we could open even if we wanted to.

Download for Windows iOS — Coming Soon Mac — In Development Android — In Development
Explore the features →
Lyunotes on the desktop: a notebook sidebar, a note list with previews, and the note editor open on a note.
Lyunotes resources tab showing image thumbnails inside an encrypted notebook's Resources folder.
Lyunotes journal view with a quick post composer, labeled entries, and a calendar sidebar.
Lyunotes unlock dialog for an encrypted notebook, prompting for a password or recovery key.

What that means in practice

Transparent location

Today, that's a local folder or whatever cloud you already use — bring your own cloud. Wherever your notes end up, we never hold the key that unlocks them.

Zero-knowledge encryption

Turn encryption on notebook by notebook. The password stays on your device — we never see it, store it, or hold a key that could replace it.

Freedom to leave

No proprietary lock-in. Your vault is a folder you control, wherever you keep it. Attachments in unencrypted notebooks keep their original filenames — encrypted ones trade that for privacy, hiding even the names.

Features

What Lyunotes does

01

Zero-Knowledge Encryption

Turn it on per notebook. We never see the key.

Learn more → 02

Notes

Fast to create, easy to find, never locked into one view.

Learn more → 03

Resources

Every note has its own resource space — and on your phone, paper becomes a PDF on the spot.

Learn more → 04

Folios

Group notes without moving them — one note, as many folios as it belongs in.

Learn more →