MathStudio is described as «formerly SpaceTime, is the most comprehensive math app available for mobile devices» and is a Calculator in the education & reference category. There are more than 25 alternatives to MathStudio for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Android. The best alternative is Wolfram Alpha, which is free. Other great apps like MathStudio are GNU Octave, MATLAB, Mathematica and Julia.MathStudio alternatives are mainly Calculators but may also be Programming Languages. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of MathStudio.
