Notifier Lite is a tool that allows you to add message at the top right corner of your SharePoint Classic pages.
Build on the top of the latest web technologies, Notifier Lite acts in Office 365 native way and ensures the message will be seen at a glance.
Notifier Lite is implemented as SharePoint provider hosted add-in. It stores the notifications settings and information inside its dedicated web in your site collection. Due to security restriction, Notifier Lite cannot complete all needed configuration steps, thus an additional setup needs to be performed by an administrator.
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This SharePoint add-in works in conjunction with another add-in, which is only available from the provider. This requires installation on your environment outside of the Microsoft Office Store processes due the level of required permissions. A tenant administrator will need to deploy this specific add-in to the tenant manually, so that it can be installed to your environment. When apps are installed outside of the Microsoft Office Store, they may bypass any, and all, safety and security checks provided by Microsoft.
If you have not done so already, it is recommended that you establish contact with the provider before proceeding with installation. Consider trying this add-in on a separate SharePoint Tenancy before installing it on your primary SharePoint site(s).
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Notifier Lite is free add-in and always will be.
You can contribute to it by rating the add-in and providing us your honest feedback at firstname.lastname@example.org