Seshat
Seshat app icon

Seshat

An ebook library for Mac that keeps up with you. Twenty thousand books open in a blink, scroll at the full speed of your display, and stay tidy on their own.

Coming soon for Mac

Seshat showing a grid of book covers, a sidebar of series and tags, and the details of the selected book
Covers, series and tags for a 20,000-book library.
Seshat's list view filtered by a search for harbor, with title, author, series, tags, size and date columns
Search as you type, with author:, series: and tag: when you need them.

Fast at any size

Built for libraries in the tens of thousands. Scrolling, sorting and searching stay instant, and long jobs run in the background without ever freezing the window.

Bring your Calibre library

Seshat reads Calibre's catalog and each book's own details, then copies everything into its library. Your Calibre folder is left exactly as it was.

Your folders, your way

Choose where the library lives and how it's arranged, like Author / Series / 01 - Title. Change your mind later and Seshat moves the books for you.

Edits that stick

Change a title or cover and it updates at once. In the background, Seshat writes the change into the EPUB itself, so the book carries it wherever it goes.

Fix messy details with AI

Pick the books with odd titles or missing authors. Claude reads their details and opening pages and corrects them. Review each change, or let it apply only the ones it's sure about.

Straight to your Kindle

Plug in a Kindle and copy books over with their covers. EPUBs are converted on the way, right on your Mac.

Made for the Mac

A native app, with the menus, shortcuts, Dark Mode and Finder integration you'd expect.

Your books stay yours

Your library and catalog live on your Mac. Seshat has no account and no tracking. Nothing leaves your computer unless you ask the AI fixer to look at a book.