OneSignal is the market leading customer engagement platform that turns acquisition spend into real activation, drives habits that keep users coming back, and breaks the churn loop before it starts. It is a unified omnichannel orchestration hub for push notifications, email, SMS/RCS, in-app messaging, and Live Activities. OneSignal powers billions of messages daily and helps businesses of all sizes connect with their audiences in real time. The platform supports mobile push, web push, email, SMS, RCS (rich communication services), in-app messaging, and Live Activities from a single dashboard. OneSignal is designed to grow with businesses from startups to Fortune 500 enterprises. It maintains high industry standards including SOC 2 Type 2, ISO 27001, and GDPR compliance.