What are some alternatives?
When comparing simperium and Apache Kafka, you can also consider the following products
GUN - Self-hosted Firebase.
IBM MQ - IBM MQ is messaging middleware that simplifies and accelerates the integration of diverse applications and data across multiple platforms.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Amazon SQS - Amazon Simple Queue Service is a fully managed message queuing service.
Pusher - Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
RabbitMQ - RabbitMQ is an open source message broker software.