What are some alternatives?
When comparing Wise Notifications and PushOwl, you can also consider the following products
PushAlert - PushAlert allows you to send push notifications to your website subscribers on Chrome, Firefox and Safari. Signup for free and send unlimited notifications.
Pusher Push Notifications API - Send push notifications programmatically at scale
PushEngage - Personalized Browser Push Notifications.
PushCrew - Push Notifications for Websites
Pushwoosh - Push Notifications Service | Your Apps Can Talk!
PushPrime - Supercharge your website with push notifications