As far as i am aware there are no function to check if a deployed app is a webapp.
A workaround as follows may work. Add a an empty file to the compiled webapp under Files Required for your app to run.
Example if you add a file "this.isawebapp". You can then check for the existence of this file in a function
function out = isawebapp()
if isdeployed
%out = exist(fullfile(ctfroot,'this.isawebapp'),'file') == 2;
out = ~isempty(which('this.isawebapp'));
else
out = false;
end
end
