There's nothing similar to QL for a smartphone or tablet.
-For a ballistic computer away from home but on a tablet or smartphone, I prefer the JBM Ballistics website.
-I use QuickTARGET Unlimited (comes with QuickLOAD) on my computer(s).
-The app called Shooter is pretty decent if you can't plan ahead and make yourself a drop chart, and don't have data access. I used it when I had an Android-based machine at my disposal. My brother still uses it and loves it.
-I use BallisticArc, too. I like it pretty well.
-The Lapua Ballistics app is good for Lapua bullets.
I decline to pay for a ballistic computer for a phone or tablet.