James Westby says ☞ couchapps show two immediate advantages:
Firstly, the ease with which they can be developed and deployed. As they are served directly from couchdb they require little infrastructure, and the couchapp tool allows for a rapid iteration. In addition, the conveniences that are provided mean that simple things can be done very quickly with little code.
The other thing that makes couchapps attractive is that they live inside the database. This means that the code lives alongside the data, and will travel with it as it is replicated.
Definitely an interesting architectural approach.
Original title and link: Couchapps Advantages (NoSQL databases © myNoSQL)