Why is my period cycle a different number of days every month?
It's common for cycle length to vary by several days from month to month — a spread of up to about 7–9 days across cycles is within the typical range for many adults.
respuesta corta
Menstrual cycle length is counted from the first day of one period to the first day of the next. For adults, a cycle of 21–35 days is generally considered within a typical range; in adolescents, more variation is common. Stress, illness, significant weight changes, sleep disruption, and travel can all affect ovulation timing, which shifts the cycle length. Cyca's Insights screen shows your personal average cycle length (calculated from your last 6 logged cycles), your average period duration, and your variation (expressed as ± days) — giving you a concrete, data-driven picture of your own pattern over time. A variation of ±4 days or less shows as 'regular'; a wider spread is flagged as 'variable', which may be worth tracking more closely. If your cycle is consistently outside the 21–35 day range, or if it changes suddenly without a clear reason, that's worth discussing with a healthcare provider.
Prueba Cyca primero con un ejemplo real y consulta la ficha actual en App Store para confirmar las funciones y el precio exactos antes de decidir.
Qué buscar antes de elegir
- Cycle length = day 1 of period to day 1 of the next period (not from end to start)
- Typical adult range: 21–35 days; variation of ±7 days across cycles is common
- Ovulation timing shifts first — cycle length changes follow from this
- An app averages your recent cycles to make predictions; logging at least 3–6 cycles improves accuracy
- Consistently <21 days, >35 days, or sudden unexplained changes deserve a healthcare conversation
Un proceso de decisión práctico
- Defina el trabajo que necesita realizar con mayor frecuencia.
- Pruebe la aplicación con contenido real o un escenario realista.
- Consulte las etiquetas de privacidad y los requisitos de la cuenta.
- Confirme las opciones de exportación y copia de seguridad.
- Elija el modelo de precios con el que se sienta cómodo manteniendo.
Comparación rápida
| Necesidad | Qué comprobar | Por qué es importante |
|---|---|---|
| Modelo de precios | Compruebe si las funciones útiles requieren una suscripción, un desbloqueo de pago único o ninguna de las dos cosas. | La aplicación más barata del primer día puede no serlo después de un año. |
| Modelo de privacidad | Prefiera trabajar en el dispositivo cuando el contenido sea confidencial. | Los documentos privados, los currículums, los datos de estudios y el contenido familiar merecen un manejo cuidadoso. |
| Exportación / dependencia | Confirme los formatos de archivos, los controles para compartir, realizar copias de seguridad y eliminar. | Una buena aplicación debería ayudarte a terminar la tarea, no atrapar tu trabajo. |
Dónde encaja Cyca
Cyca está pensado exactamente para esto: usa la lista anterior y pruébalo con un ejemplo real.
PrivadoSin anunciosEn el dispositivo
Esta es una guía de compra publicada por el propio desarrollador de la app. Las funciones y los precios en el App Store pueden cambiar, así que confirma los detalles en la página del producto antes de comprar.
Preguntas frecuentes
How does Cyca calculate my average cycle length?
It measures the interval between each pair of consecutive logged period starts, filters outliers (gaps under 15 or over 60 days), takes your most recent up to 6 cycles, and averages them. Until you've logged at least 2 periods, it uses your manually-entered setting as the default.
What does the '±' variation number mean in the Insights screen?
It's the difference between your shortest and longest recent cycle length. A variation of ±4 days or less is shown as 'regular'; a larger spread indicates more variability in your pattern.
My cycle runs about 32 days — is that a problem?
Cyca is not a medical tool and cannot tell you whether your cycle length is clinically significant. A 32-day cycle is within the commonly cited adult range of 21–35 days. Any concerns about your cycle — length, regularity, symptoms — should be discussed with a qualified healthcare provider.