That looks pretty great. I'm currently using a very similar application for notifications https://pushover.net/ https://pushover.net/ What does your service u

That looks pretty great. I'm currently using a very similar application for notifications https://pushover.net/ https://pushover.net/ What does your service use for sending the notifications, and how likely is it that it will either disappear, or become commercial? Pushover is paid for (once) rather than based on volume - the latter would scare me away, but if it were free I'd be too worried it would disappear to rely upon it. (I send about 10 notifications a day at the moment, and could easily see that becoming a 100 when I get round to it!)