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A notepad that calculates alongside written working

Standard, scientific, programmer and date calculations

Engineering worksheets that mix formulas and explanation

Scientific expressions with variables and numerical calculus

A notepad calculator with variables and calendar expressions

Current-limiting resistor calculations for LED arrays

Residential HVAC load, selection and duct calculations

Thermal-comfort models with visible environmental inputs

Cutting plans for sheet, linear and roll materials

Online cutting plans with printable reports

Recipe calculations connected to a brewing batch

Bicycle gearing comparisons with cadence and tyre information

Household carbon arithmetic with visible assumptions

Natural-language calculation beside short notes

Scientific expressions with dimensions checked as types

Android scientific calculation with symbolic and graphical tools

A handheld-style scientific calculator for Android

A common language for computational mathematics

Symbolic tensor calculations for field-theory problems

Symbolic transformations for very large expressions

Portable symbolic algebra with numerical approximation

Calculations in algebraic geometry and commutative algebra

Computer algebra with graphs, geometry and statistics

Steady-state chemical flowsheet calculations