Biorhythm API

The biorhythm API turns any birth date into the daily cycles that biorhythm theory tracks, with no calculator page to build and nothing to host. One key returns daily readings, multi day forecasts, critical day alerts, and two person compatibility, so you can ship a wellness, productivity, dating, or fitness timing feature in hours. The same key also unlocks 11 more spiritual data domains and a Remote MCP server, so AI assistants like Claude Code, Cursor, and VS Code can call it in seconds with no Docker and no local setup.

Send a birth date and an optional target date and you get a complete reading back: every cycle as a value from negative 100 to positive 100, a named phase, an energy rating from 1 to 10, and editorial interpretation and advice written from the actual cycle states. Results are a pure deterministic calculation from the birth date, so the same inputs always return the same answer and you can cache freely. Drop in the typed SDKs for TypeScript, Python, or PHP, or the WordPress plugin and UI components, and a working calculator is live the same day.

It returns ten cycle types where most calculators ship only three. You get the three primary cycles, physical at 23 days, emotional at 28 days, and intellectual at 33 days, plus four secondary cycles, intuitive, aesthetic, awareness, and spiritual, and three composite cycles, passion, mastery, and wisdom. That depth lets a wellness or coaching product go far beyond the usual chart, all in a single call and across eight languages.

Critical days are the dates a cycle crosses its midpoint and flips between its high and low halves, which biorhythm theory treats as caution days for big decisions, travel, or peak physical effort. The biorhythm API scans any date range and flags each crossing with its cycle, direction, and a single, double, or triple severity based on how many primary cycles turn on the same day. It is the timing signal sports, productivity, and wellness apps use to tell users when to push and when to ease off.

Pass two birth dates and a target date and the biorhythm API overlays both sets of cycles into a per cycle alignment score, an overall score from 0 to 100, a clear rating, and written strengths, challenges, and advice. It is a natural fit for dating apps, couples features, and team scheduling, where two people want to know when their energy lines up. Because it is a deterministic calculation, every pairing is reproducible and instantly cacheable.

Yes. Give a birth date and a date range and the biorhythm API returns a day by day forecast with an energy rating for each day, then names the best day, the worst day, the number of critical days, and overall guidance for the window. That makes it a drop in planning layer for calendars, planners, and coaching tools. The same forecast is available through the Remote MCP server, so AI agents can plan a user week without any local install.