Short answer For individuals, after a 30-day free trial, it costs $4.99 USD once, per-platform (iPhone/iPad, Android, Desktop), to use on all of your own devices1 on that platform as you want. There are no monthly or yearly fees and you can receive as many notifications as you can handle. Long answer As an end-user receiving push notifications, our iPhone, iPad, Android, and Desktop clients are free to try for 30 days. After 30 days, you'll need to purchase a $4.99 USD license for each platfo...| support.pushover.net
Pushover 4.0: Expiring Messages, New Apps View, Supporting Development| blog.pushover.net
Custom sounds| blog.pushover.net