Qaltex is a tape-like calculator with straightforward interface and a lot of features. It is inspired by many other similar applications, but solves their disadvantages and at the same time it is empowered with some unique options and widgets.




SpeedCrunch is described as 'Free, fast, high precision open source algebraic calculator with an intuitive interface and many features, such as variables, syntax highlighting, functions, persistent input history & more' and is a very popular Calculator in the education & reference category. There are more than 100 alternatives to SpeedCrunch for a variety of platforms, including Windows, Android, Web-based, Mac and iPhone apps. The best SpeedCrunch alternative is Qalculate!, which is both free and Open Source. Other great apps like SpeedCrunch are OpenCalc, fxSolver, Numbat and GeoGebra Scientific Calculator.
Qaltex is a tape-like calculator with straightforward interface and a lot of features. It is inspired by many other similar applications, but solves their disadvantages and at the same time it is empowered with some unique options and widgets.




Calculator++ is an advanced, modern and easy to use scientific calculator.




RealCalc Scientific Calculator Android's #1 Scientific Calculator. A fully featured scientific calculator which looks and operates like the real thing. Looking for fractions? Degrees/minutes/seconds? Landscape mode? You need RealCalc Plus. See elsewhere on this page for the l.


A simple yet powerful calculator that includes standard, scientific, and programmer modes, as well as a unit converter. It's the perfect tool to add up a bill, convert measurements in a recipe or other project, or complete complex math, algebra, or geometry problems.



Kalk is a convergent calculator application built with the Kirigami framework. Although it is mainly targeted for mobile Linux platforms, it can also be used on the desktop.

Next generation notepad-based calculator, built with extendibility and privacy in mind. Works on Windows, macOS and Linux.




galculator is a GTK 2 / GTK 3 based calculator with ordinary notation/reverse Polish notation (RPN), a formula entry mode, different number bases (DEC, HEX, OCT, BIN) and different units of angular measure (DEG, RAD, GRAD).

Numbr is a currency calculator, a notepad that understands your calculation. You can use notes with numbers alongside each other. And all your numbers are instantly calculated as you type.


OpalCalc is a brand new type of calculator for the PC. As easy to use as Notepad or a word processor, OpalCalc allows natural language in the sum and multi-line support so you can go back and adjust your previous calculations on the fly.




Hissab is a simple and intuitive calculator, unit-convertor and productivity application.




As a kid, I loved playing with a calculator. Whether a calculator watch or a TI-89, it offered an intoxicating command over impossibly large numbers and could be hacked to share messages with friends. Somewhere along the way, the calculator became another boring tool.





Windows Calculator does not have an amazing history function like SpeedCrunch. Additionally, everything about it is slow and poorly designed.