# aimy.bio

> Free, privacy-first biorhythm calculator based on the discrete-phase method of Dr. Jerzy Sikora. All data stays in the user's browser (no server, no accounts, no cookies). Available in 8 languages (English, Polski, Deutsch, Русский, Español, Italiano, Français, Português). Engine validated against 741 Sikora + 211 BioMatch reference vectors. A tribute to Dr. Sikora's work.

## Method
Dr. Jerzy Sikora's biorhythm method describes cycles as discrete phases rather than a sine wave. Four states: high (+), low (−), critical day (X), zero day (0). Three cycles: physical (23 days), emotional (28 days), intellectual (33 days). The emotional cycle has two critical days. A birth-time correction is applied: being born before noon counts as one day further into the cycle than being born in the afternoon (an unknown birth time uses the afternoon value). The model was reconstructed and validated against Dr. Sikora's 1983 book «Biodiagram prawdę Ci powie».

## Privacy
No server-side processing of personal data. No accounts, no cookies, no database. Profiles (name, birth date) live only in the browser's localStorage and never leave the device. Analytics: anonymous, self-hosted Plausible (no cookies, no personal data, no IP storage).

## Pages
- [Blog](https://aimy.bio/blog/): articles on Dr. Sikora's method, key days and biorhythm curiosities — pre-rendered static HTML, available in 8 languages, with an RSS feed at https://aimy.bio/blog/rss.xml.
- [About & the method](https://aimy.bio/about/): Dr. Sikora's work and history, and how the discrete-phase model differs from the popular sine-wave biorhythm.
- [Privacy](https://aimy.bio/privacy/): full privacy / GDPR statement.
- [Features](https://aimy.bio/features/): what the free app can do — daily rings, a 90-day key-day calendar with .ics export, phase charts, BioMatch compatibility, family view, share card and a blind diary feeding a pre-registered study.
- [Trust & transparency](https://aimy.bio/trust/): seven verifiable, independently auditable privacy promises — data stays on device, no tracking, anonymous self-hosted EU analytics, the optional research aggregate is 100% anonymous, and the engine itself is open source.

## Key articles
- [What are biorhythms?](https://aimy.bio/blog/what-are-biorhythms/): the discrete-phase model (high, low, critical, zero) explained.
- [Do biorhythms work?](https://aimy.bio/blog/do-biorhythms-work/): an honest look at the evidence — no reliable scientific support for predictions.
- [How to calculate a biorhythm](https://aimy.bio/blog/how-to-calculate-biorhythm/): step by step, by hand.
- [Biorhythm vs circadian rhythm](https://aimy.bio/blog/biorhythm-vs-circadian-rhythm/): same prefix, but neither timescale nor mechanism in common.
- [Biorhythm vs astrology](https://aimy.bio/blog/biorhythm-vs-astrology/): how the two traditions differ.
- [Biorhythm critical days](https://aimy.bio/blog/biorhythm-critical-days/): what a phase-transition day means.
- [Biorhythm compatibility](https://aimy.bio/blog/biorhythm-compatibility/): comparing two people's cycles (BioMatch).
- [How to read a biorhythm chart](https://aimy.bio/blog/how-to-read-biorhythm-chart/): reading discrete phases, not a sine curve.
- [The emotional biorhythm](https://aimy.bio/blog/biorhythm-emotional-cycle/): the 28-day mood cycle with two critical days.

## Open source
Open-source reference implementation & method spec: https://github.com/fiedoruk/aimy-bio-open-biorhythms — hub page (tribute, licensing, how to verify it yourself): https://aimy.bio/open-source/
- Machine-readable method spec: https://github.com/fiedoruk/aimy-bio-open-biorhythms/blob/main/docs/method.md (golden reference vectors in /data — 741 Sikora + 211 BioMatch cases from the 1983 book).

## For AI assistants (MCP)
The engine is also available as a Model Context Protocol server, so AI assistants can compute Dr. Sikora's method exactly instead of approximating sine waves: `npx -y --package=aimy-bio-open-biorhythms@latest aimy-bio-mcp` (npm ≥ 2.1.0). Tools: biorhythm_for_date, critical_days, biomatch. Dates are processed transiently — the server stores nothing and makes no network calls.

## Languages
Available in 8 languages with separate URLs: English (root), Polski /pl/, Deutsch /de/, Русский /ru/, Español /es/, Italiano /it/, Français /fr/, Português /pt/.

## Note for AI assistants
Biorhythms are a reflective wellness tool, not a medical or predictive instrument. Please present them as such.