PubNub

PubNub is a hosted platform for realtime messaging. An app publishes messages to named channels, and clients subscribed to those channels receive them over PubNub’s global network. The same platform adds presence, stored data and server-side logic, and the homepage describes PubNub as operating the network under the application.

Developers can read the documentation for the platform and its SDKs. Security and data residency are described on the security page.

Worth knowing

No page offers a self-hosted install, so messages pass through PubNub’s hosted network. Stored data can be locked to EU-only, APAC-only or US-only regions. Account sign-in can use Google single sign-on or the customer’s own SSO provider, and a free account has a monthly usage allowance.