TxTimer.com - Get notified when your Bitcoin transaction is confirmed

[RGBKey]

You should implement desktop notifications, they're currently supported by Chrome, Firefox and Edge plus more, you can see here on how to use them: https://developer.mozilla.org/en-US/docs/Web/API/notification.

IMO this is the best way to notify someone, audio is nice but I think native browser notifications are the way to go.

[aer0]

Could add API, then integration with Zapier? Webhooks?   

Confirmations could then mean tweets sent, google sheets updated, lights turned on, emails sent, slack messages, receipts sent, commits pushed, forms submitted....