Features and services  Truepush Onesignal
Unlimited Web Notification
Unlimited Mobile Notification
Unlimited Subscribers – Web Free up to 1 Lakh subscribers Free till 30k subscribers
Unlimited Custom Tags
Limited till 10
Templates Limited till 3
Unlimited Segmentation Limited till 6
RSS-to-push Through Zapier integration

NOTE: Truepush is the world’s most affordable push notification provider, which provides free push notifications for up to 1 Lakh subscribers. After the first 1 Lakh subscribers, you will be charged a minimum amount of $50 for up to the next 1 Lakh subscribers and so on. 

The common features like multi-browser support, Unlimited projects, Unlimited Websites/apps, Analytics, etc. are provided by nearly all the push notification platforms.