Your Logitech mouse, finally local.

No. It’s an independent, open-source project, not affiliated with or endorsed by Logitech. “Logitech”, “MX Master” and “Options+” are their trademarks.

Yes. OpenLogi and Options+ both speak HID++ to the same device, and only one can own a receiver at a time — quit Options+ (including its menu-bar agent) first.

MX Master 4, 3S and 3, MX Anywhere 3, Signature M650 and Ergo M575 — over a Logi Bolt, Unifying or Lightspeed receiver, direct Bluetooth, or USB. Keyboards get F-row remapping, Fn-lock and RGB or backlight control; Litra lights and Logitech webcams are supported too.

All three are supported. Linux ships .deb, .rpm and Arch packages with udev rules and a systemd user unit. Windows is the newest port — validated end-to-end on Windows 11 hardware, with signed .msi installers in every release.

Neither. The only network calls are device-image downloads and an opt-in update check that’s off by default — everything else stays on your machine.

In a single plain-text TOML file. The GUI writes your bindings, presets and profiles to it directly, the Settings window covers app-wide preferences, and the file stays hand-editable.