We have a Countdown Timer for Confluence server edition and we have requests to port it for Confluence Cloud.
Atlassian Forge looks like a viable option since there is no need for a separate hosting infrastructure to provide the service.
It is a bit challenging because it is not possible to embed CSS and Javascript. Nevertheless, I think we addressed the objective since a Confluence page is not a static dashboard. People only need the information when the page is refreshed.
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