OpalCalc is described as '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' and is a Calculator in the education & reference category. There are more than 50 alternatives to OpalCalc for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best OpalCalc alternative is SpeedCrunch, which is both free and Open Source. Other great apps like OpalCalc are Qalculate!, Numara Calculator, Numbat and Qaltex.
SpeedCrunch is a 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.
Germany
EU
Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).
SwedenEU
High precision scientific calculator with full support for physical units (web and terminal versions).
GermanyEU
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.
Numi is a handy calculator app for macOS. It allows to describe tasks the natural way and instantly get an accurate answer. For example, $20 in euro - 5% discount or today + 2 weeks. Numi is not limited to simple calculations, it can solve expressions of any complexity, with...
Russia
Free online scientific calculator from GeoGebra: perform calculations with fractions, statistics and exponential functions, logarithms, trigonometry and much more!
AustriaEU
Do you ever grab a calculator & the back of an envelope to work through an idea or problem that involves some math?
Australia
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.
United States
Next generation notepad-based calculator, built with extendibility and privacy in mind. Works on Windows, macOS and Linux.
Its an app where you do maths like a normal person. It lets you type whatever you want and smartly figures out what is math and spits out an answer on the right pane. Then you can plug those answers in to future equations and if that answer changes, so does the equations its...
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).
