Building-from-source instructions contains only how to build a couchdb daemon for Mac OS X. However official release at http://couchdb.apache.org/#download contains the app with UI. This app is based on CouchDBX, but is more recent.
The CouchDBX source I was able to find is 3years old: https://github.com/janl/couchdbx-app/blob/master/README
Update to this document is much desirable for beta-testing.