Question: I'm looking for a tool that can send targeted push notifications to users across multiple platforms, including web browsers and messaging apps.

For a tool that can send targeted push notifications to users on multiple platforms, including web browsers and messaging apps, CleverPush is a good general-purpose option. It can send messages to web browsers, mobile devices and to popular chat apps like Facebook Messenger and Telegram. It also has features like machine learning-based user segmentation, follow-up campaigns and SDKs to integrate with your own systems, so it's good for publishing, e-commerce, travel and financial services.

Another good option is Reteno, which offers omnichannel engagement across eight notification channels: mobile push, in-app push, email, SMS, web push, messengers and app inbox notifications. It's designed for easy integration and automation, with more advanced features like event-driven campaigns, personalization and segmentation. Reteno integrates with Firebase, BigQuery and PostgreSQL so you can segment and message precisely, and it's a good choice for reactivating inactive users into loyal customers.

Courier is a notification API that lets developers send notifications through multiple channels with a single API. It integrates with more than 50 providers, offers SDKs for many programming languages, and has features like omnichannel templates, centralized analytics and customizable UI components. That makes it a good choice for companies that want to modernize their notifications without a lot of programming work.

For a more specialized approach to personalized mobile push notifications and emails, Vero offers a customer engagement platform that personalizes messages based on user behavior. It offers personalized onboarding, churn prevention, segmentation, multi-channel messaging and A/B testing. Vero connects to many product data sources and offers a free trial that doesn't require you to enter a credit card number, so it's a good choice for improving customer engagement with data-driven messages.