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Topic-based calculators for practical questions

Mathematics and practical calculators by subject

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

Graph equations, inspect points and evaluate functions

Equations explored through graphs and symbolic methods

An Android calculator with scientific mode and history

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

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

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

Engineering formula calculators by discipline

Build an ETF portfolio and schedule contributions around its allocation

Business checking with invoices and automatic reserves for upcoming costs

Peer-to-peer Bitcoin trading through desktop and mobile clients

Send invoices from your phone and follow their status on the web

Take payments at a counter, online or through an invoice

Administer funds from several managers through one New Zealand portal

Connect subscription pricing, usage charges and invoice operations

Automate game-asset reduction with explicit quality and format controls

Manage UK investments with flat monthly plans and scheduled purchases