Conditional Message

INTRODUCTION

Conditional message is designed to display custom messages to a targeted audience with minimal effort and maximum flexibility.

This module tries to follow the best practices and allows the site to be cached as usual. As a result it provides a personalized experience to the user while not degrading performance.

Versions

The Drupal 8/9+ version allows the creation of multiple messages based on different criteria since version 8.x-1.0-alpha5. It also handles message translation since 8.x-1.0-beta5.
On Drupal 7 you can have one site control the message on other multi-sites. Setup the module then enable conditional_message_client module on all other multi-sites and configure them to point to the site you configured initially. Please consider that this setup is complex and might require custom configuration of your servers/domains.