Easiest way to update live app with development app?

When you say that you have been developing on a local machine do you mean that you have a completely separate app that you have been working on?

If you need to import another app into another you could use depedencies: Is there an easy way to create an API in Anvil? - #2 by stefano.menci

We use the Anvil version control to push changes to production (also custom domain). General flow looks like this:

  1. Create a new branch for development,
  2. Make changes
  3. Merge changes with master
  4. Reset production to the new merged position

More info here Anvil Docs | Version Control