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Air-travel carbon estimates with a published methodology

A maintained HP-42S calculator simulator

Visual calculator forms with custom price rules

Graph equations, inspect points and evaluate functions

Equations explored through graphs and symbolic methods

An Android calculator with scientific mode and history

Engineering formula calculators by discipline

An iPad-first tutoring board that saves lessons as A4 pages in a book for each student.

A catalogue of practical and specialist calculations

A desktop calculator with recall and configurable precision

Statistical calculators linked to formulas and references

Browser tools for beam and structural calculations

Circuit and electrical formulas grouped by task

Mortgage broker that compares lender rates and shows the real cost of each loan.

Compare text contrast with its size, weight and colour direction in view.

WordPress forms for estimates, payments, and front-end submissions

Food nutrient lookup, comparisons and personal recipe records

Artwork and photograph research with a separate reproduction service

Algebra entry with solving, factoring and graphing modes

Scientific expressions with variables and numerical calculus

A notepad calculator with variables and calendar expressions

Current-limiting resistor calculations for LED arrays

A simplified photovoltaic energy-production estimate

Instrument-specific observing calculations