Changing your app after it is live

Put the new version up exactly the way you put up the first one — paste it, upload it, push to GitHub, or ask your assistant.

The web address stays the same. Anyone who has bookmarked it, or is using it right now, keeps working. There is no separate step to "release" or "promote" anything.

Going back

Every version you deploy is kept. If an update broke something, open the app and choose an earlier version to go back to. It takes a few seconds and does not need the original code.

This is worth knowing before you need it: you can always undo a deploy.

While the new version is building

The old one keeps serving. Visitors do not see an error page or a "deploying" screen — they see the previous version right up until the new one is ready.

Nothing changed after I deployed

Almost always one of these:

• The upload did not include the file you edited — check you zipped the right folder
• Your browser is showing you a cached copy — try a hard refresh, or open it in a private window
• The build failed, so the old version is still serving. Check the app's page: a failed build says so plainly, and my build failed explains the common reasons

If none of those is it, tell us the app name and we will look.