Sites and apps similar to DubiumLabs include Wolfram Alpha, which has a free version. Other options are GeoGebra, Symbolab Math Solver and PhET Interactive Simulations. In total there are four Calculators like DubiumLabs for Android, iPhone, iPad, Mac and Windows.
Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.
United States
GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching. It has received several educational software awards in Europe and the USA.
Austria
EU
Symbolab: equation search and math solver - solves algebra, trigonometry and calculus problems step by step
Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.
