Download the desktop app
CompNinja in its own window, with its own icon on your desktop and taskbar — no browser tabs, nothing else to manage. The app stays current automatically: it is the live CompNinja, so there is never an update to install.
First launch: Windows may show a SmartScreen prompt and Mac may say the developer is unverified — that is the standard notice for a new, not-yet-registered publisher, not a fault. On Windows choose More info → Run anyway; on Mac right-click the app and choose Open the first time.
Prefer nothing to download? Open compninja.co in Chrome or Edge and click the install icon in the address bar — same app, straight from your browser.