OneSignal

A notification and messaging platform for product and marketing teams. It integrates multiple channels including push notifications, email, SMS/RCS, in-app messages, and web push to automate user onboarding, engagement, and retention journeys. Implementable via multiple SDKs and APIs for Android, iOS, Flutter, and React Native, with personalization and analytics capabilities.

OneSignal demonstrates moderate transparency with a transparency score of 42% (14 of 33 items verified). While HIPAA, SOC 2 Type II, and ISO 27001 certification...