In the past few days there's been a discussion on Boardgamegeek in the Android: Netrunner forum about the possibility of a deckbuilder app. However, FFG has never come out with one, nor is anyone working on one that we know of.
However, I think we may have found a workaround. It's not a perfect solution, but it actually works OK and you can use it with any LCG/CCG you play.
It's a comic book app called ComicZeal. Effectively, you're importing your card images as if they were a bunch of 1-page comic books (each "book" is a zipfile full of JPGs for individual pages).
I've been able to write a fairly simple python script to read, rename, and zip up all the images from the Call of Cthulhu LackeyCCG plugin, from there it's fairly easy to import them into Comic Zeal and start organizing them.
You do have to organize them manually, but it's a one time operation and while annoying the payoff is pretty good to be able to browse cards and build decks anywhere.
It's not all perfect though. You can search by card name, but not by anything else. Supposedly keyword searching will be in a future version. Importing brings images in in a flat list, so you have to organize them yourself. I'm doing folders by faction, then folders by card type, then dividers by cost.
Once your cards are imported and organized, it's time to build decks. I'd recommend creating another folder for your decks, and subfolders for each individual deck. Then what you do is browse around and 2-finger drag cards you want to the right side of the scree, into what the app calls the slider. The slider shows how many cards are currently in there. Then you can go to your deck folder and drag the cards out of the slider. The quirky parts are:
1. You can't use the 2x2 grid view with the slider, you have to use the less useful list view (hoping this feature is added later)
2. Three copies of a card will show up as three cards, not one card with a 3x notation, unless you want to import triple copies of all your cards which I doubt you do.
Anyway, I'm still messing with it, just bought the program today. But, I thought some of you might be interested and I'll update the thread with more impressions as I work with it. Honestly, I'm quite willing to put up some minor inconveniences because the alternative is having nothing or trying to use cardgamedb through the web browser which isn't so hot either. Note that you CAN use cardgamedb to do more useful searching and then look up the cards by name in Comic Zeal which partially gets around that problem.