Superblock

You can customize the notification which really matters to you. Provides a kind of edge to existing phone / device notification system as it treats all the notification in same way and same priority. You can simply choose customized alarm sound based on notification like for alerts we have chosen some emergency threshold sound which gives us reminder for purging activity. Good support on web and app for both Android and IOS. Charging model is pretty straight based on one time charges.

I love having access to Pushover's API, which makes adding push notifications to personal dev projects I'm working on. I also love the way you can use a variety of programming languages, including Python which is ideally suited for use on a Raspberry Pi. This makes sending push notifications really simple, and their API documentation is fantastically presented.