A changelog tool (Beamer, AnnounceKit) publishes release notes and a notification widget. An in-app announcement popup shows the update on the page where the feature lives, once per user. Use a changelog tool for SEO and a historical feed. Use TinyPopups when adoption is the job — from $19/mo.
A changelog tool publishes release notes to a public page and usually adds an in-app notification widget. Beamer and AnnounceKit are changelog tools.
Pick a changelog tool when a public release-notes page is the artifact. Pick an in-app announcement popup when users must see the update inside the product without opening a bell.