Flat now has a desktop app for macOS and Windows: the full editor in a window of its own, free to download, with your library in sync across desktop, web and mobile.

• Works offline. Write, edit and play back scores without a connection; your changes sync when you are back online.
• Your scores on every device. With Flat Power, the library you see on the desktop is the same one you open on the web, iPhone, iPad and Android.
• MIDI input over USB and Bluetooth. Plug in a keyboard and play the notes in.
• Opens your files. Double-click a score in Finder or Explorer and it opens in the app, not a browser tab.
• Sign in with Apple on macOS, alongside the sign-in options you already had.
• Keeps itself up to date. New versions install on their own.

Free to download; a Flat account is only needed to sync. Get it at flat.io/desktop.