Where does the capo go? Right here. You know a song in E but you want to sing it in G. Or your guitarist buddy plays it with a capo on the second fret and you need to know what key that actually makes it. SUS4 Capo Calc works it out instantly — pick your open key, pick your target key, and the app tells you which fret to put the capo on and what chord shapes to use. When you change your tuning — say, drop D or open G — the calculation updates to account for the new open string pitches. Useful for anyone who transposes songs to suit their voice or who works with multiple guitarists in different keys. • Capo position calculator: from key to fret in one tap • Shows equivalent chord shapes for the capo position • Updates automatically when tuning changes • Works for standard and common alternate tunings • 2 free calculations/day — unlock unlimited with a subscription Runs fully on-device. No internet connection needed.