About

aimy.bio is a free, fully private biorhythm app based on the method of Dr. Jerzy Sikora. It was built as a tribute to his work in this unusual field.

Dr. Jerzy Sikora's method

Unlike the popular sine-wave model, Dr. Jerzy Sikora's method describes biorhythms as discrete phases with four states: high (+), low (−), critical day (X) and zero day (0). Each of the three cycles — physical (23 days), emotional (28 days) and intellectual (33 days) — has its own precise phase layout, with the emotional cycle notably having two critical days.

The method also applies a birth-time correction (different for those born in the morning vs the afternoon) — a detail omitted by simplified calculators yet essential for consistency with the source materials.

	+	X	−	0
Physical (23)	1–10	11	12–21	22–23
Emotional (28)	1–12	13–14	15–26	27–28
Intellectual (33)	1–15	16	17–31	32–33

How it differs from the sine wave

Most calculators draw a smooth sine wave and read percentages off it. In Sikora's method the meaning lies in specific days — above all the critical day (X) and the zero day (0) — not in the shape of the curve. In this app the sine wave is used for visualisation only; the phase symbols tell you what a given day actually is.

History and validation

The app's calculations were reconstructed and validated against reference files from 1983, 2000 and 2001 documenting Dr. Sikora's work. The engine is guarded by a set of golden vectors (shared between the web and mobile versions) so it stays faithful to the original through every update.

The first online version appeared in 2025. This edition is a full reconstruction of the method, running entirely in your browser — no accounts, and no server computing anything on your behalf.

What it is — and isn't

The app is free, with no accounts, ads or paywalls. We treat biorhythms reflectively — this is a wellness tool, not medical advice or a predictive instrument.

This site stands as a tribute to the work of Dr. Jerzy Sikora.