Your shelf, on your desk.

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Windows (Intel or AMD) Windows on ARM (Snapdragon)

Which one? Most PCs are Intel or AMD. If yours is a Copilot+ PC, a Surface Pro 11 or Surface Laptop 7, or anything with a Snapdragon chip, take the ARM one; it runs natively and goes easier on the battery. To be sure, open Settings › System › About and look at System type: “ARM-based processor” means ARM.

Windows 10 or 11. The installer is about 10 MB, needs no administrator rights, and installs for you alone.

What Windows will say

Code signing is how Windows recognizes who made an app. Tomen’s isn’t in place yet, so Windows treats the installer as unknown. Nothing about the app is different; the warning is about the missing signature.

• Your browser may hold the download as “not commonly downloaded.” In Edge, open the downloads panel, choose ⋯ › Keep, then Show more › Keep anyway. Chrome has a similar Keep.
• “Windows protected your PC” appears when you open it. Choose More info, then Run anyway.
• If there is no Run anyway, Smart App Control is on, and it blocks every unsigned app. Leave it on. Use Tomen in your browser for now (it installs as an app and works offline); the Microsoft Store version, which Windows trusts, is on the way.

After that first run, Tomen updates itself, and you won’t see the warning again.

What the app adds over the browser

• Open with Tomen. EPUB, MOBI, AZW3, FB2 and the comic formats open straight from Explorer. Windows decides the default app, so Tomen shows you where to choose it rather than taking it.
• A watched folder. Point Tomen at a folder, a Calibre library or your Downloads, and new books appear on the shelf as they land.
• A see-through shelf. Turn it on in Settings › Appearance › Window and your covers float over your desktop. Books still open on a solid page.
• The keyboard. Ctrl+K finds any title, chapter or setting; press ? for every key.
• Your Calibre server. Private OPDS catalogs connect directly, without the browser’s limits.
• The window keeps up. The title bar takes your theme, the taskbar shows import progress, and F11 gives you the page and nothing else.