Reporting, comparisons and perspectives on scientific calculators and digital math tools.
Featured story · Reviews & comparisons
Compare 10 free scientific calculators by familiar fx-991ES PLUS, fx-991EX and fx-991CW-style keys, natural input, worked steps and graphs.
Reviews & comparisons
A model emulator, a familiar keypad and an online math tool solve different problems. We compare the choices with a real CalcES calculation and Casio's published emulator options.
Reviews & comparisons
An illustrated comparison of Scientific Calculator Plus 991 on Android, NCalc on iPhone and CalcES on the web: real interfaces, algebra, graphs, offline use and cost.
Perspectives
A quadratic can have the right roots without telling you why. See what a worked solution and a graph reveal, and where each check stops.
