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Arithmetic, finance and programming modes in one app

Integration with visible input, steps and graphs

A searchable catalogue of calculations and conversions

Air-travel carbon estimates with a published methodology

A maintained HP-42S calculator simulator

Visual calculator forms with custom price rules

UK savings accounts with online statements and maturity instructions

Graph equations, inspect points and evaluate functions

Equations explored through graphs and symbolic methods

AI voice agents for inbound and outbound business calls, with WhatsApp follow-up and CRM sync.

AI web app that rewrites legal documents into plain English

An Android calculator with scientific mode and history

Buy, sell and close a home online with matched agents in one workspace.

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

Engineering formula calculators by discipline

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

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