Calca is described as 'powerful symbolic calculator that updates as you type giving you instant answers. It solves equations and simplifies complex expressions. It's also a rich Markdown text editor so that you can explain your ideas alongside your calculations' and is an app in the Education & Reference category. There are more than 10 alternatives to Calca for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Self-Hosted solutions. The best alternative is SpeedCrunch, which is both free and Open Source. Other great apps like Calca are Qalculate! (Free, Open Source), Mathematica (Paid), Windows Calculator (Free, Open Source) and Soulver (Paid).
Do you really need your calculator's on-screen number pad? (You know, the virtual keyboard?) Really small! Memo + Calculator! Characteristics: Because there is no number pad, the window size is very small. Auto calculate per line.
CalcPad is a smart notepad that calculates answers based on what you type in. It allows you to type in math expressions, assign variables, define functions, convert units, add units together and much more.