RPN Calculus App Reviews

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Calculators are a crowded field. This is a very clean, elegant example; I keep it around with PCalc, which has the advantage of running on iPhone and in portrait mode on iPad. The new color scheme is IMO a small step backward. Could we please have a setting for the original one? Or perhaps a compromise: the new scheme, but color-on-gray for the red & blue keys; they're just a little too up-front.