Solve is multiple calculators built into one. In other words, it’s a calculator that can take multiple avatars. It could be your basic, run-of-the-mill calculator that you would need daily. And it can also take up graphing tasks related with high school math. The app comes with an innovative memory setup for storing and recalling answers. It has four tabs that choose four unique calculators, which have their own color. This means you can multiply numbers, solve an equation, and plot a graph at the same time or without clearing results.