A landing page for a Replit built app is making a promise about something a visitor has not seen yet. The fastest way to make that promise credible is to show the actual deployed app doing the thing the page claims it does. A demo video placed above the fold does that job directly, without asking the visitor to click through and try it themselves first.
The detail that matters most here is which URL the video is built on. A Replit project has a workspace where the app is built and a deployed route where it actually runs for the public. Those are not always the same, and a video recorded against the wrong one can show behavior a real visitor will never see. Get the route right before anything else about this asset matters.
This one video is usually the first of several a builder ends up producing from the same deployed app. A share with a client video, a portfolio demo, and an app review walkthrough all draw on the same reachable route and the same preparation discipline, just aimed at a different audience with a different question. Treating the deployed route as a stable asset worth keeping in good shape pays off across all of them, not just this one placement.
