I'm looking for alternatives to the web interface for gmail desktop, and the GMail app for iOS.
While there are lots of apps out there, the only one I've found so far that understands and can use labels is spark mail (sparkmailapp.com) I have too much mail to use the free option, and won't buy SaaS.
Anyone know of other apps that understand and can use gmail labels, but NOT tread them as folders? E.g. such a program could still do a search for "Has-label:farm has-label:customer" to find messages that have both labels?