About PiNumpad. Phi

PiNumpad is a free memory trainer for phi (1.61803398874989...), the golden ratio, the unique number satisfying φ = 1 + 1/φ. This page explains how phi is implemented in the trainer, grouping logic, colour coding, and anything specific to this constant.

About this constant on PiNumpad. The About page explains how this particular constant is implemented in PiNumpad: how the digits are grouped, what the colour coding means, and any notes specific to this constant that differ from the others.

Phi appears in geometry, art, architecture, and nature, from the proportions of the Parthenon to the spiral of a nautilus shell. It is the limit of consecutive Fibonacci number ratios. Check this page if you are new to PiNumpad and want to understand the grouping logic before you start, or if you are switching from another constant and want to understand the differences.

PiNumpad is designed for designers, architects, artists, mathematicians, and anyone curious about the patterns underlying natural and aesthetic proportion. It runs entirely in the browser with no account, no installation, and no cost. Progress is saved locally using your browser's storage.

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