OneSignal

The American company OneSignal offers users the ability to send push notifications across various channels with its eponymous tool: Mobile Push, Web Push, In-App, Email, or SMS. Its features include real-time reporting, scalability, A/B testing, and segmentation for personalized messages. Additionally, users should be able to send automated notifications based on user behavior at the optimal time. OneSignal can be linked with various tools. In addition to a free version, there is a 'Growth' and 'Professional' package, with prices based on the number of subscribers: the 'Growth' package starts at $9 per month and the 'Professional' package starts at $99 per month.