Hi there! I hear your Kardia app on your Mac isn't opening properly and just shows a rotating ring. Let's see if we can get that sorted out.

To start, a spinning or rotating ring usually means the app is trying to load but is stuck somewhere. Can you tell me if this started happening suddenly, like after an update or a restart? Also, are you using the Kardia app directly on macOS, or are you running it through some other means like an emulator?

Meanwhile, here’s a step-by-step guide to try that might help:

1. Force Quit and Restart the App
- Click the Apple menu (top-left corner) → Force Quit…
- Select Kardia if it’s listed, then click Force Quit.
- Relaunch the app and see if it opens normally.

2. Restart Your Mac
- Sometimes, a simple restart clears up background issues.
- Click the Apple menu → Restart, then try opening the app again.

3. Check Internet Connection
- Make sure your Mac is connected to the internet because Kardia may need access to their servers to load properly.

4. Update the App
- Check if there is an available update for the Kardia app in the Mac App Store or the official AliveCor website, and install it if there is.
- Apps sometimes hang if the version is out of date.

5. Check Bluetooth Access and Permissions
- If your Kardia device connects via Bluetooth, make sure Bluetooth is on and the app has proper permissions.
- On macOS Catalina (10.15.7), go to System Preferences → Security & Privacy → Privacy tab → Bluetooth, and ensure Kardia app is allowed.

6. Clear Application Cache (if applicable)
- Go to Finder → in menu bar, choose Go → Go to Folder…
- Enter ~/Library/Caches and find any folder named with Kardia or AliveCor and delete it; then reopen the app.

7. Reinstall the Application
- If none of the above work, uninstall Kardia app by dragging it to Trash.
- Download the latest version fresh from the official site or App Store and reinstall.

Could you try these and let me know if anything changes? If the problem persists, I can help you with more advanced troubleshooting or suggest contacting support if needed.

Are you satisfied with these initial steps?