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Subject calculators and a custom calculator builder

Visual email automation with a simulator for tracing contact branches

A multi-platform embedded IDE with built-in compilers, a debugger and a simulator.

A maintained HP-42S calculator simulator

A browser editor for micro:bit projects with Blocks, JavaScript, Python, and a device simulator.

A keypad calculator with clear, memory and percentage controls

A graphing-calculator emulator in the browser

A TI graphing-calculator emulator for classroom explanation

Everyday calculation categories with a simple keypad

Compare camera images in original and simulated colour-vision views.

Everyday calculations with topic-specific explanations

Programmable scientific arithmetic with saved formulas

Scientific, graphing, fraction and matrix calculations

Inspect a full-screen colour-vision simulation across applications.

Readable calculators for quick everyday tasks

IELTS practice and lessons with writing samples, vocabulary exercises and a speaking simulator.

Organize dividend portfolios and compare income-growth scenarios

Standard, scientific, programmer and date calculations

Android scientific calculation with symbolic and graphical tools

A handheld-style scientific calculator for Android

Linked mathematical views for algebra, geometry and graphs

Cloud-service cost estimates with inspectable assumptions

Azure cost scenarios from selected services and usage

Free voice calculator you speak to, in the browser or on iPhone.