The technology, the UI, the UX, how the synchronization happens (using PouchDB now), it's now also possible to import a CSV from the iOS app, expense types now show global counts and costs, and there's auto-categorization (matching previous expenses with the same name).
Yes, the format is the same.
We use and recommend Cloudant through IBM Bluemix. It's free for quite a bit of data. You signup and launch it (or setup your own CouchDB server anywhere), create an "expenses" and a "types" db inside your Cloudant or CouchDB dashboard, and then paste the URL with the credentials in the "URL" field inside the Settings tab (like "https://user:[email protected]").
Yes! You just need to use the same URL for the CouchDB server.
Like most things I do does, this is open sourced in GitHub. Feel free to create issues and submit PRs.
They're still available through the old page for now, but because the iCloud sync method used in them has been deprecated by Apple, we're not sure when they'll stop working.