I surprised no-one has mentioned pcalc. https://pcalc.com/ https://pcalc.com/ It’s a really good engr/sci calc for iOS/MacOS. Unless I’m going for a specific

I surprised no-one has mentioned pcalc. https://pcalc.com/ https://pcalc.com/ It’s a really good engr/sci calc for iOS/MacOS. Unless I’m going for a specific need (Gotta have this exact HP compatibility, need funky plotting, etc) this is what I reach for first.