The majority of the drugs we use are in single dose vials, or single use pre-loads.
We have our RSI dose chart on the wall of the ambulance.
For Pedi doses we have a Braslow tape.
For drips, remember the clock method.
Formula Apps are not 100% foolproof. Everyone knows how hectic it can get in the back of an ambulance. With the size of phones and keypads, or touch screens, I bet it would be pretty easy to fat-finger a decimal point in a drug calc and give something in Mgs that should have been Mcgs, or the opposite.
Like stated medic math isn't that hard, 2 basic formulas cover just about everything. Most calculations can be figured out quicker than it takes to break out the phone and turn the App on.
Sasha, I am a little bit older, but not jealous.
I embrace technology, always have the latest phone, computer, etc. Sometimes technology don't really cut it. You know the old saying "treat the patient, not the monitor". Sometimes you need to go with whats in your head, not what an App tells you.