THE CIRCLE CONSTANT

π, memorized.

A circle's circumference divided by its diameter, forever. Learn it one chunk at a time, then prove it under pressure.

circumference ÷ diameter

01 — Study

Learn the digits

Reveal pi in small, spaced-out chunks. Set your own pace, watch each new group light up, and lean on a mnemonic to lock in the first digits.

↗

02 — Recall

Test yourself

Type the digits from memory. Every box turns green the moment it's right, red the moment it's wrong — no guessing where you stand.

↗

STUDY MODE

Reveal it gradually

Pick how many digits show per group and how far you want to go today. New groups pop in highlighted so you always know what's fresh.

Chunk size digits/group (1–25)

Study up to digits (up to 10,000)

Memory trick Count the letters in each word of: "Now, I wish I could recollect pi easily, since all those figures constantly bother me." That gives 3-1-4-1-5-9-2-6-5-3-5-8-9 — the first thirteen digits, hidden in plain sentence.

RECALL MODE

Type it from memory

Choose a length, then type each digit. Boxes turn green the instant a digit is right, and red the instant it's wrong — nothing is hidden until the end.

Test length digits (up to 10,000)

0

Correct digits

0

Correct streak from start

0%

Accuracy