Chose OneSignal
OneSignal is the one that has more integrations with plugins, external API and that is completely free and easy to install. They have a very good UI with many options and they will never ask for money to use this service. You can have unlimited subscribers and you can send …
Independently Invited by TrustRadius
A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info