Install Luna
Click the icon for your machine. Chrome installs from the Chrome Web Store. Windows and Mac are the desktop apps. Twenty-four hours free the first time it loads, then $137 / year or $250 lifetime — buy or redeem a key. Usage included.
Chrome extension
Windows app
The Windows build is an always-on-top panel that captures system audio (what you hear), so Zoom and Meet desktop apps work. It reuses the same panel as the extension.
Open the zip and double-click Luna. Press Listen. The first time, if Windows asks, choose Keep, then More info, then Run anyway.
Mac app
Always-on-top panel, same UI as Chrome. Allow Screen Recording to hear Zoom and Meet on the Mac. If that is denied, Luna listens through the microphone.
Open the disk image and drag Luna into Applications, then open it. The first time, if macOS says the developer can’t be verified, right-click Luna, choose Open, then Open again.
Already on Mac or Windows? Update Luna. The first launch uses a Luna account.