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The aldosterone-renin ratio is the most popular test for the case detection of primary aldosteronism, which entails the most common, albeit overlooked, form of endocrine secondary hypertension. A major hindrance to the clinical use of the aldosterone-renin ratio depends on the difficulty of achieving the calculation of this ratio, given that laboratories provide plasma aldosterone in different units of measurement, and renin is measured as plasma renin activity or direct active renin. We have therefore developed an App, which can be downloaded from the ESH website and the Apple store, to assist practising physicians in performing this calculation. Our hope is that this simple tool will help in increasing the detection rate of primary aldosteronism and ultimately the long-term cure of many hypertensive patients.