Rule of 3 Calculator is described as «portable tool that allows you to apply the mathematical Rule of Three in an easier, faster and more practical way!» and is a Calculator in the education & reference category. There are more than 100 alternatives to Rule of 3 Calculator for a variety of platforms, including Android, Mac, Online / Web-based, Windows and iPhone. The best alternative is SpeedCrunch, which is both free and Open Source. Other great apps like Rule of 3 Calculator are Wolfram Alpha, Qalculate!, fxSolver and Windows Calculator.
