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The preview updates itself as Leo works. No refresh, no build step to trigger. Alongside it you get a mobile view toggle, a reload button, an open-in-new-tab link, and the Network Monitor. The split between chat and preview is resizable, and your setting is remembered.

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Who can see it

The preview URL carries an access token (?auth=<token>). Without the full URL, it shows a login wall, and it is never indexed by search engines. Anyone you send the full link to can open it, which is how you show work in progress. See Project Visibility for the full picture, and for how to lock down a published app.

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If it looks stale

Open the preview in its own tab and hard reload (Cmd+Shift+R or Ctrl+Shift+R). Reloading HelloLeo itself does not clear the preview iframe’s cache.