Inherent compatibility
This score comes from how your birth dates align with each cycle length (23, 28, 33, and secondary periods). It does not change with the calendar day.
Compare Your Cycles
Enter two birthdays to see inherent compatibility and how in sync you are on any day — for primary and secondary biorhythms.
Overall compatibility
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Today's sync: —
Daily Sync Chart
Higher lines mean you are more in phase that day. Tap a day to inspect it.
Compare
Cycle Compatibility
Inherent match from your birth dates, plus how aligned you are on the selected day.
Side by side
Readings on This Day
Each person's cycle values for the selected date.
Inherent compatibility uses the classic formula based on the number of days between two birthdays for each cycle period. Daily sync measures how close your sine values are on a chosen date — useful for planning shared activities.
Understanding Biorhythm Compatibility
Daily sync
Daily sync shows whether you are rising and falling together on a given day. High sync can feel easier for teamwork, dates, or shared focus.
How to use it
Use strong physical sync for active plans, emotional sync for connection, and intellectual sync for decisions or study sessions together.