This is the first time I've heard of Ninefold. I checked out the service just now.

The first thing I looked for was support for multiple environments (e.g., staging and production). I searched ninefold.com for "staging" using Google, and there weren't any relevant results:

https://www.google.com/search?q=staging+site:ninefold.com

Here's an example of the type of information I was looking for:

https://devcenter.heroku.com/articles/multiple-environments

The second thing I looked for was support for zero-downtime deployments. I searched ninefold.com for "zero downtime deployments" using Google, and there weren't any relevant results:

https://www.google.com/search?q=zero+downtime+deployments+si...

Here's an example of the type of information I was looking for:

https://devcenter.heroku.com/articles/labs-preboot

After not finding the above two features, I stopped looking for other features that interest me.