Privacy

Koma is a private shelf for manga you already have. Your books, pages, and account stay on your sign-in. They are not sold and they are not used to advertise.

The website

Signing in with Google shares your name, email, and profile photo so the shelf can stay yours. Drive access is a separate prompt, and it only covers files you pick or folders Koma creates. Guest reading stays in the browser until you sign in.

The Chrome extension

The extension reads a chapter tab only when you click its icon, so it can save that chapter’s reading pages into a Google Drive folder you choose. It does not run on pages you have not opened, and it does not watch your browsing.

After you sign in with Google, you choose which shelf pages to keep in the extension. Those images stay in Chrome on this device. Removing the extension removes them.