OneSignal

OneSignal operates a customer engagement and lifecycle marketing platform for sending messages across channels: push notifications for mobile apps and web, SMS/RCS, email, and in-app messaging — all managed centrally from one system instead of separate tools per channel.

With AI-powered orchestration, the platform automates drafting, sending, testing, and optimizing campaigns across the typical stages of the user lifecycle — from onboarding through activation to retention. SDKs for Android, iOS, Flutter, React Native, Expo, and Unity simplify technical integration, complemented by AI-assisted setup and connections to common analytics, CDP, and CRM systems.

According to the company, one in four app publishers uses OneSignal, with more than 1.3 trillion messages sent annually and 1.5 billion monthly active users across roughly 200,000 connected apps. Customers include Zynga, Whole Foods, and Philips.

The business model follows a "free to start, built to scale" approach: a free tier covers smaller applications, while companies with higher volume get custom enterprise packages through sales.

Besides Zynga and Whole Foods, OneSignal also lists the cryptocurrency platform Bitcoin.com among its customers, illustrating the range of industries that rely on cross-channel user communication — from gaming to retail to fintech.

In-app messages can be tailored to specific user segments, so new users receive different prompts than long-time, returning customers, for example.