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There's an open-source Android app called Droid48 that gives you a virtual HP48, if you're into that sort of thing.

I know when I'm out with coworkers and they whip out Droid48 to calculate the tip, I picked a good place to work.

For ios, I've used Free42 and i48 (Daniel Parnell).

I own an actual 42S and I prefer Free42.

I prefer the iOS app called 42s. Better user interface in my opinion.

I've had a decent experience using RealCalc Plus, although it's just my backup when I don't have my 32SII handy.