Leona

For Mac · Apple silicon · macOS 14 or later

Think with AI.
Keep what matters,
in files you own.

Leona is a quiet Mac app for working with AI models. Talk to a model running on your own Mac, or one you choose in the cloud. When a conversation is worth keeping, Leona proposes notes for your Library: plain Markdown files in a folder you pick, written only after you approve them.

Download for Mac See it in use

In private testing: download, then request a free test license.

A question about an invented bakery business, answered from its Library. The pages the answer used are listed on the right.

How it works

  1. 1

    Talk

    Ask, draft and think out loud with a model on your Mac (through Ollama), or with Anthropic, OpenAI or OpenRouter using your own key. Attach a PDF or a Word document; dictate if you prefer.

  2. 2

    Review

    Press Save. Leona proposes new or updated pages for the right section of your Library and shows exactly what would change. Untick a page, edit it, or tell Leona how to revise it: “shorter, dates first”.

  3. 3

    Keep

    Approved pages are written as Markdown files in your folder, with every earlier version kept so you can go back. Later conversations can draw on them and show which pages they used.

See it in use

Short clips and pictures taken from Leona itself. Everything in them is invented: the bakery, its people and its numbers.

Find anything with ⌘K. Pages, notes, conversations and actions, matched as you type.
A short welcome tour. Eight stops the first time you open Leona; take it again any time from Help or Settings.
Five themes, light or dark. Default, Minimalist, Gothic, Cyberpunk and Terminal.
The Library home: a graph of sections, folders and pages joined by their links, with recently changed pages below
Your Library at a glance. Sections, folders and pages, and the links between them.
A Library page with links to other pages, the pages that link to it, and its history
A Library page. Links to other pages, the pages that link back, and its history: compare or restore an earlier version.
The review window listing one page to add to and one new page, each with its changes line by line
Saving a conversation. Leona proposes page changes and shows each one line by line, with the sentence from the chat it came from. Untick, edit or ask for a revision, then save.
A conversation with its to-do list open beside it; two items are for named people
To-dos from a conversation. Action items pulled out of the chat, with who each one is for.
Notes: a list of notes and a meeting note open, with Dictate and Save to Library at the top
Notes. A meeting written up as a note, with dictation and Save to Library at the top.
The calendar filling the window, showing a month with a few events
The calendar, full size. Press ⌘Y; the small one stays in the sidebar.
The conversation window in the dark look
Dark, for the evening. Every theme has a light and a dark version.
Default theme
Default
Minimalist theme
Minimalist
Gothic theme
Gothic
Cyberpunk theme
Cyberpunk
Terminal theme
Terminal

Privacy, in plain words

Each line says what Leona does, and where it stops.

Everything in one calm window

Library

Sections such as Personal and Work, folders, links between pages, page history, and a graph of how it all connects.

Search everything

⌘K finds pages, notes, conversations and actions by any word in them, and forgives a capital letter or a stray full stop.

Notes

Quick notes, kept encrypted or as plain Markdown files, your choice per note. Dictate into a note, or let it listen to a meeting.

To-dos and calendar

Pull action items out of a conversation or meeting notes, with who each is for. Put dates on a calendar that stays on your Mac.

Reading

An RSS reader that shows plain text, and a browser with tracker blocking and nothing remembered after you quit. Save what you read to your Library.

Documents

Attach PDFs and Word files, import them into your Library, and turn a conversation into a PDF, Word or Markdown file.

Keyboard first

Every place has a shortcut; ⌘K reaches everything else. Arrow keys and Tab move through lists.

Your look

Light or dark, and five themes: Default, Minimalist, Gothic, Cyberpunk and Terminal.

Bounded help

An agent that can only use a short list of tools on your Mac, shows its plan, and asks before every change.

Download

Private test

Leona is in private testing. Anyone can download it; it opens with a free test license, which you request below.

Download for Mac (.dmg)

Version 0.1.0 (build 2) · October 9, 2026 · 7 MB · SHA-256 93afd85bed199afb4fa772d68a12cacfafbe1b7f00231aa0ddf22a7247e61ede

Requires macOS 14 or later on a Mac with Apple silicon. 16 GB of memory or more is recommended for local models.

Signed with a Developer ID and notarized by Apple.

Request a test license

Write to us with the email address you want the license for. Each request is read by a person; when it is approved, your license code arrives by email. Paste it into Leona when it asks.

Request a test license by email

Or write to info@scottmcevoy.com.

Questions

Do I need an internet connection?

Not with a local model: conversations, your Library, search, notes, to-dos and the calendar work on your Mac. Cloud models, RSS feeds and the browser need the internet, and only connect when you use them.

Which AI models can I use?

Models running on your Mac through Ollama, and cloud models from Anthropic, OpenAI or OpenRouter with your own key. Leona suggests local models that fit your Mac’s memory.

Can I read my notes without Leona?

Yes. Library pages are Markdown files in your folder. Open them in any text editor, or in Obsidian.

Does Leona collect data about me?

No analytics. The app contacts only the AI providers you choose.

How do I get a license?

During testing, licenses are free. Request one by email from the Download section; it arrives by email once approved, and works without an internet connection.

How much will it cost?

Pricing will be announced before release.