Preview, hosting, and idle sleep

Each site is an isolated container with its own database. You get an HTTPS preview hostname as soon as spin-up finishes. That is a real site — not a screenshot.

Idle sleep

Sites that sit unused pause so you only pay for active runtimes. Opening the editor or hitting the URL wakes the site. Files and the database persist. First request after sleep can take a few seconds.

Always-on

Production sites you care about should stay visited or be on a plan that keeps them ready. If a client is launching tomorrow, open the site once so it is warm.