Google Cloud Messaging (GCM) is a free service that enables developers to send messages between servers and client apps. This includes downstream messages from servers to client apps, and upstream messages from client apps to servers. | It is a push notifications platform for Web and Mobile. It is very fast, GDPR compliant and full-featured. It supports all major native mobile and web platforms, provides a RESTful API and an online dashboard to design notifications and analyze their impact. |
Versatile Messaging Targets: Distribute messages to your client app in any of three ways — to single devices, to groups of devices, or to devices subscribed to topics.;
Downstream Messaging: For purposes such as alerting users, chat messaging or kicking off background processing before the user opens the client app, GCM provides a reliable and battery-efficient connection between your server and devices.;
Upstream Messaging: Send acknowledgments, chats, and other messages from devices back to your server over GCM’s reliable and battery-efficient connection channel.;
| Easy setup of new notifications; Supports segmentation; Easy automation; Analytics |
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OneSignal is a high volume push notification service for websites and mobile applications. OneSignal supports all major native and mobile platforms by providing dedicated SDKs for each platform, a RESTful server API, and a dashboard.

We’ve built the smartest, most aware, precise, easy-to-use, scalable, secure and powerful push messaging platform on the planet. Our Push messaging platform leverages all that is unique about mobile as a channel, and that lights the spark to create meaningful and valuable mobile experiences. We help put your app in front of your users at the right time, and in the right place to drive usage and brand engagement.

Amazon Simple Notification Service makes it simple and cost-effective to push to mobile devices such as iPhone, iPad, Android, Kindle Fire, and internet connected smart devices, as well as pushing to other distributed services. Besides pushing cloud notifications directly to mobile devices, SNS can also deliver notifications by SMS text message or email, to Simple Queue Service (SQS) queues, or to any HTTP endpoint.

It is a cross-platform messaging solution that lets you reliably deliver messages at no cost. You can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention. For use cases such as instant messaging, a message can transfer a payload of up to 4KB to a client app.

Amazon Pinpoint makes it easy to run targeted campaigns to drive user engagement in mobile apps. Amazon Pinpoint helps you understand user behavior, define which users to target, determine which messages to send, schedule the best time to deliver the messages, and then track the results of your campaign.

Send push notifications to iOS and Android devices through one unified Push Notifications API for Google Cloud Messaging (GCM) and Apple Push Notification Service (APNS).

PushCrew enables any website to send push notifications to their users (even when they are not on the website). A simple JavaScript code makes it working on any website in less than 2 minutes. It's a fantastic new alternative to email marketing.

ZeroPush provides a clean web-friendly API to APNS and GCM for mobile push notifications.

Reach all your customers on mobile or desktop. Send and manage push notification, in-app messages, or polls. Understand user behavior, retention and engagement.

Send website notifications directly to the desktop when new content is fresh from the oven.