OneSignal

OneSignal started as a push notification platform and has evolved into a multi-channel messaging hub handling push notifications, email, SMS, and in-app messages from a unified interface. The platform lets teams build automated customer journeys triggered by user behavior, managing communications across all channels without needing separate point solutions for each channel.

Suited to mobile-first companies and apps where push notifications are a primary communication channel alongside email and SMS, OneSignal appeals to product teams and mobile-heavy brands. It's positioned between niche SMS-only tools and full-featured enterprise CDPs, offering good balance of ease of use and multi-channel coordination for growth-stage and enterprise mobile apps.