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Subject calculators and a custom calculator builder

A keypad calculator with clear, memory and percentage controls

An Android calculator with scientific mode and history

Room-mode calculations for rectangular and shaped rooms

A graphing-calculator emulator in the browser

A TI graphing-calculator emulator for classroom explanation

Everyday calculation categories with a simple keypad

A meeting-mode whiteboard for teachers, with a free meeting limit and a paid whiteboard-only plan.

Preview links in your browser without opening new tabs

An Android outliner for Org-mode notebooks, nested notes, tags, and manually synchronized files.

A Markdown writing and notes app with folder and Library modes for Apple devices.

Everyday calculations with topic-specific explanations

Programmable scientific arithmetic with saved formulas

Scientific, graphing, fraction and matrix calculations

Readable calculators for quick everyday tasks

Organize dividend portfolios and compare income-growth scenarios

Turn typed text into handwritten-looking pages for print or notebook photos.

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.