simple-update-notifier is a straightforward Node.js package that simplifies the process of notifying users about available updates for your command-line tools. It fetches package information from npm and compares the current version with the latest one. When an update is found, simple-update-notifier displays a non-intrusive notification message to the user, encouraging them to update. This helps ensure users are running the newest versions and benefiting from bug fixes and new features.