Hi there Amanda and welcome
No, there is no such app that exists, the reason is if the app is on your phone then it uses the memory, not matter how it is displayed or stored.
No, what it does is uses the website versions of apps, eg: Facebook, so you do not have the facebook app installed it just redirects you to the website, so for Twitter ect and services that have a website it directs you there, which is something you can do yourself.
But it does not do anything with the actual apps, actually it can stop the install of them, as, no matter what you do, once an app is installed it needs that space on your phone, else it could not exist on it.
Correct, and it wraps them so you do not see it so clear.
An uninstalled app stops taken space once it is uninstalled.
There is no real use of Hermit, if you want to use apps, and if you want to use websites, then your best just to open the browser and go there, it is a much better experience.
The service Hermit provided is not really popular or used as it is actually not really useful and you save more space not having it installed and going direct to the website. but it is the best one that does this
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.