Always On repls are now available for all Replit users with a Hacker plan, allowing them to keep up to 5 repls running at all times. This feature addresses the issue of repls going to sleep when inactive, providing a reliable way to host and run apps continuously. The new Always On feature is particularly useful for web servers, cron jobs, Discord bots, and other applications that require persistent connections or continuous execution. However, it also has some limitations, such as occasional server migrations and file system changes not persisting. Replit aims to differentiate between development and production environments in the near future, adding another exciting feature to their platform.