Addi is described as *»Java based and open sourced version of matlab and octaveGetting more and more compatible over time»* and is a Calculator in the education & reference category. There are more than 25 alternatives to Addi 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 Addi are GNU Octave, R (programming language), MATLAB and Mathematica.Addi alternatives are mainly Calculators but may also be Programming Languages or Statistical Analyzers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Addi.